2018年增刊共收录67篇

1. Droplet Distribution and Deposition of Fixed Pipes Cold Fogging System in Greenhouse

Accession number: 20191406729522

Authors: Li, Xue (1, 2); Lü, Xiaolan (1, 2); Zhang, Meina (1); Lei, Xiaohui (1)

Author affiliation: (1) Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing; 210014, China; (2) Key Laboratory of Agricultural Engineering in the Middle and Lower Reaches of Yangtze River, Nanjing; 210014, China

Corresponding author: Lü, Xiaolan(lxlanny@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 199-204

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Sprayers used in greenhouse have poor atomization performance with low efficiency of pesticides and workers were poisoned badly, as a result, a fixed pipes cold fogging system was designed. In order to evaluate the performance of the fogging system, a comparison test between the system and trolley sprayer was carried out, meanwhile, peppers in fruiting period were chosen to explore the influence of crop canopy on droplet distribution of fogging system. In the test, the air pressure of fogging system was 0.3 MPa, the hydraulic pressure was 0.05 MPa, and the application rate was 2 L/min. The trolley sprayer was placed at a distance of 2 m from the front collection area, in the middle of the greenhouse, and the air cylinder and the horizontal ground had an angle of 15°, spraying forward, the application rate was 1.5 L/min. The total application time was 5 min. The results showed that different from the trolley sprayer, the droplet deposition coefficient of variation of fogging system among different collection areas was only 13%, indicating that the fogging system can achieve unmanned pesticide application throughout the greenhouse with good uniformity of droplet distribution; the presence of peppers in the greenhouse was conducive to droplets gather on surrounding leaves, droplet deposition in the vertical height in different regions had no significant difference, with coefficient of variation no more than 13%. In summary, the fogging system had stable working performance and uniform droplet distribution, obviously improving the control efficiency of pests and diseases, realizing the separation work between human and the fogging system, having wide prospect in application. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Fog dispersal

Controlled terms: Deposition? - ?Disease control? - ?Drops? - ?Efficiency? - ?Greenhouses? - ?Pesticides? - ?Spraying

Uncontrolled terms: Atomization performance? - ?Coefficient of variation? - ?Droplet deposition? - ?Droplet distribution? - ?Fogging system? - ?Pesticide applications? - ?Twin-fluid? - ?Working performance

Classification code: 443.1 Atmospheric Properties? - ?802.3 Chemical Operations? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?821.6 Farm Buildings and Other Structures? - ?913.1 Production Engineering

Numerical data indexing: Percentage 1.30e+01%, Pressure 3.00e+05Pa, Pressure 5.00e+04Pa, Size 2.00e+00m, Time 3.00e+02s

DOI: 10.6041/j.issn.1000-1298.2018.S0.026

Compendex references: YES

Database: Compendex

2. Design of Multipath Precision Fertilizer and Sowing Control System Based on Attitude Real Time Monitoring

Accession number: 20191406729517

Authors: Zhu, Qingzhen (1, 2); Wu, Guangwei (1); Luo, Changhai (1); Wei, Xueli (1); Wang, Xiaoou (3); Meng, Zhijun (1)

Author affiliation: (1) Beijing Agricultural Information Technology Research Center, Beijing; 100097, China; (2) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Science and Technology Information Center, General Administration of Agriculture and Reclamation of Heilongjiang, Harbin; 150030, China

Corresponding author: Wu, Guangwei(wugw@nercita.org.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 155-163

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Winter wheat is the most important crop in Huang-Huai-Hai (HHH) zone of China. Fertilization is an important process of wheat production, which directly affects the yield of crops, reasonable and effective use of chemical fertilizer can improve the yield of crops. At present, the automation level of wheat sowing and fertilization is very low in China, most of the sowing and fertilization machines are driven by ground wheels, the amount of sowing and fertilizer cannot be controlled accurately which caused the uneven distribution. In order to reduce the amount of fertilizer and improve the work quality in wheat production, agronomic method and precision control technology must be used to improve the performance of the sowing and fertilization machines. The method of stratified fertilization and sowing is an ideal agronomic method of winter wheat production in HHH zone of China. A control system of multipath precision fertilizer and sowing was designed based on attitude real time monitoring. The precision control system was designed to achieve the requirements of the precision operation. The angle sensor was installed in the middle of lower link of tractor, which was used to judge the working attitude of machine. Its working principle was hydraulic motor driven sowing and fertilization, the amount was adjusted according to the change of the machine’s speed obtained by GPS. The amount of the seed, the shallow fertilizer and the deep fertilizer can be controlled independently. The sowing and fertilization working performance of the control system was tested in static and dynamic condition. The coefficient of variation of seed, the shallow fertilizer and the deep fertilizer was within 3%, 3.5% and 3.8% at speed of 5 km/h and target displacement of 225 kg/hm2, 150 kg/hm2 and 300 kg/hm2, respectively. The result showed that the amount of sowing and fertilization consistency was good and relatively constant, variation coefficient of each row was small at the same speed, which can meet the requirement of the actual production. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Quality control

Controlled terms: Agronomy? - ?Control systems? - ?Crops? - ?Fertilizers? - ?Hydraulic machinery? - ?Hydraulic motors? - ?Systems analysis

Uncontrolled terms: Chemical fertilizers? - ?Coefficient of variation? - ?Fertilization? - ?Precision control? - ?Real time monitoring? - ?Sowing? - ?Static and dynamic conditions? - ?Variation coefficient

Classification code: 632.2 Hydraulic Equipment and Machinery? - ?731.1 Control Systems? - ?804 Chemical Products Generally? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?913.3 Quality Assurance and Control? - ?961 Systems Science

Numerical data indexing: Percentage 3.00e+00%, Percentage 3.50e+00%, Percentage 3.80e+00%, Velocity 1.39e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.021

Compendex references: YES

Database: Compendex

3. Analysis of Physicochemical Composition and Dynamic Mechanical Properties of Avena sativa Stalk

Accession number: 20191406729455

Authors: Wu, Min (1); Pan, Hongyu (1); Zhao, Donglin (2); Li, Dong (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 447-455

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The mechanical properties of Avena sativa stalks are the basis for Avena sativa growth, harvest, threshing, cleaning process and equipment design, which also contribute to deep processing and modification of polymer resources. The physical and chemical components and microstructure characteristics of Avena sativa stalks in different internodes were investigated. The shear and compression properties of Avena sativa stalks under static loading conditions were analyzed, the results of which presented that the moisture content significantly affected the shear and compression mechanical parameters (p2) were all above 0.99. As the moisture content was increased, the elastic modulus (E1) and the equilibrium elastic modulus (Ec) were decreased, and the stress relaxation time (τK) was increased. The structural analysis and mechanical properties of Avena sativa stalks can provide experimental basis for the development of Avena sativa stalk collection and processing machinery. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 35

Main heading: Dynamics

Controlled terms: Chemical analysis? - ?Cleaning? - ?Elastic moduli? - ?Machinery? - ?Mechanical properties? - ?Moisture? - ?Moisture determination? - ?Physicochemical properties? - ?Stress relaxation? - ?Viscoelasticity

Uncontrolled terms: Avena sativa? - ?Composition analysis? - ?Different moisture contents? - ?Dynamic mechanical analyzer? - ?Dynamic mechanical property? - ?Microstructure characteristics? - ?Model fitting? - ?Physico-chemical composition

Classification code: 802.3 Chemical Operations? - ?931 Classical Physics; Quantum Theory; Relativity? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?944.2 Moisture Measurements? - ?951 Materials Science

Numerical data indexing: Percentage 1.51e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.061

Compendex references: YES

Database: Compendex

4. Feature Extraction and Evaluation for Agricultural CAD Model Based on 3D Wavelet Transformation

Accession number: 20191406729541

Authors: Liu, Honghao (1); Zhao, Xiuyan (1); Zhang, Kaixing (1); Song, Zhenghe (2); Liu, Xianxi (1, 3)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China; (3) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Tai’an; 271018, China

Corresponding author: Zhang, Kaixing(kaixingzhang@139.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 338-346 and 274

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A new 3D model retrieval method was proposed to improve feature extraction accuracy, which could further satisfy the needs of agricultural intelligence retrieval. Firstly, the CAD models in agricultural database were normalized. Then CAD models were transformed into eight subband partitions by 3D discrete wavelet. The two-level wavelet transform was made for LxLyLz, which were the lowest frequency parts. After that a single CAD model could be represented by 15 frequency functions. The AHP method was used to calculate the weight of different functions, with which the similarity value was defined for similarity comparison. Finally, the effectiveness of the proposed method was proved with ESB and agricultural model database by using VS2010, Matlab 2016b and Open Cascade. The retrieval results in ESB database showed that the ranking deviation of wavelet algorithm was lower than those of others under the same retrieval condition. The harvester reel retrieval results presented that the similar evaluation considered the geometry morphology as well as functional request. The applied instance demonstrated that once the similar models were selected, designer only needed to make a small re-edit and modification to finish the total design work. The precision of wavelet transform retrieval algorithm varied with different wavelet functions and coif wavelet showed high applicability. APH method could sufficiently distinguish the weight of various decomposed parts. At present, two-level wavelet transform was quite enough to meet model retrieval requirement. The wavelet transform method aiming at design retrieval could satisfy design needs and broaden design ideas, which can promote intelligent design. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Computer aided design

Controlled terms: 3D modeling? - ?Agriculture? - ?Database systems? - ?Extraction? - ?Feature extraction? - ?Function evaluation? - ?Petroleum reservoir evaluation? - ?Wavelet transforms

Uncontrolled terms: 3D CAD Modeling? - ?3D model retrieval methods? - ?Agricultural machine? - ?Evaluation method? - ?Extraction accuracy? - ?Intelligent designs? - ?Retrieval algorithms? - ?Wavelet transformations

Classification code: 512.1.2 Petroleum Deposits : Development Operations? - ?723.3 Database Systems? - ?723.5 Computer Applications? - ?802.3 Chemical Operations? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921.3 Mathematical Transformations? - ?921.6 Numerical Methods

DOI: 10.6041/j.issn.1000-1298.2018.S0.045

Compendex references: YES

Database: Compendex

5. Design and Experiment of Two-disc Rotary Mower of Alfalfa

Accession number: 20191406729524

Authors: Fu, Zuoli (1); Wang, Decheng (2); Li, Wei (1); Huang, Yuxiang (1); Zhu, Ruixiang (1)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Wang, Decheng(wdc@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 214-220

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In view of the current situation that the research of alfalfa harvesting equipment in China is not enough and the quality of alfalfa is not high, combined with the agronomic characteristics and physiological characteristics of alfalfa, a new type of double rotary cutter was designed. The device can be hung in front of a tractor or self-propelled mower through the use of external stent and it also can work combining with the flattening rollers to finish mowing, flatting and gathering. The device integrated the nonstandard cutter, conical shaped rotating cylinder assembled guide device, circular cutter, sliding palm, transmission system, the four connecting rod lifting device and a fixed bracket. Round trip cutting can ensure smooth cutting and a certain height of alfalfa. The material would be promoted under the effect of the conical shaped rotating cylinder, and the height value and the angle between the horizontal plane and generatrix of conical shaped rotating cylinder were trigonometric function. The field performance experiment showed that the recutting rate, miss cutting rate and grass-crushing rate of two-disc rotary mower were 0.8%, 0.19% and 0.3%, respectively, which were 46%, 24% and 40% lower than the standard technical requirements. All the parameters of performance experiment were in higher level than the standard of GB/T 10938-2008 rotary mowers. And the cutting quality can satisfy the technical requirements. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Cylinders (shapes)

Controlled terms: Design? - ?Lawn mowers

Uncontrolled terms: Alfalfa? - ?Parameters of performance? - ?Physiological characteristics? - ?Rotating cylinders? - ?Technical requirement? - ?Theoretical analysis? - ?Transmission systems? - ?Trigonometric functions

Numerical data indexing: Percentage 1.90e-01%, Percentage 2.40e+01%, Percentage 3.00e-01%, Percentage 4.00e+01%, Percentage 4.60e+01%, Percentage 8.00e-01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.028

Compendex references: YES

Database: Compendex

6. Optimization and Experiment of Spike-tooth Elements of Axial Flow Corn Threshing Device

Accession number: 20191406729530

Authors: Su, Yuan (1); Liu, Hao (1); Xu, Yang (1); Cui, Tao (1); Qu, Zhe (1); Zhang, Dongxing (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Xu, Yang(xuyang@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 258-265

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Corn with high moisture content in Huang-Huai-Hai region of China had a high moisture when it was harvested, which caused high broken rate and un-threshing rate when mechanical harvesting and restricted the development of corn grain harvest. There were many current studies on corn threshing process at home and abroad. But most studies were on the structure of corn threshing machine. Based on the threshing system of axial flow corn threshing device, through the theoretical analysis of working process of spike-tooth, a kind of curved spike-tooth was designed and optimized to solve the problems. The distinct element method (DEM) was a numerical simulation method for dealing with discontinuous medium problems, which was widely used in the field of bulk material processing. Enhanced distinct element method(EDEM)software was a general computer aided engineering (CAE) analysis software based on the DEM, which was commonly used to simulate and analyze particle processing and operating system in industry and agricultural production. The discrete element simulation model of threshing process was established by using discrete element software EDEM, and the normal force and tangential force of trapezoid spike-tooth and curved spike-tooth were determined by studying the mechanism. The simulation result showed that the tangential force of trapezoid spike-tooth and curved spike-tooth was 24.47 N and 20.65 N, respectively, and the average force of normal force was 50.93 N and 45.47 N, respectively. The threshing test was compared with the traditional trapezoidal spike-tooth with different materials. The result showed that breaking rate of Q235 trapezoid, Q235, NBR and polyurethane rubber was 10.23%, 9.84%, 8.03% and 8.35%, and un-threshing rate was 0.53%, 0.92%, 0.77% and 1.02%, respectively. The corn breaking rate was 20% lower than that of the traditional nail, and un-threshing rate was no more than 1.02%. The single factor test was carried out with the factors of roller speed, threshing clearance and feeding amount as factors. Zhengdan 958 with grain moisture content of 28% was set as test material. When using NBR nailed teeth, the feeding amount of corn ear was 10 kg/s, the threshing clearance was 55 mm, the drum speed was 300 r/min, the threshing results showed that breaking rate and un-threshing rate was 8.03% and 0.77%, respectively, which had the best threshing effect. The threshing roller was divided into four sections along the axis, and the distribution of the number of falling corn and corn breaking rate in the threshing test were analyzed. The results showed that the first two sections of the drum were the main threshing area of fruit spike, and the amount of falling grain was about 80% of total grain quantity, and the first section of drum was larger in the threshing of the fruit ear, and the corn breaking rate was the highest. The design of the curved spike-tooth not only had reasonable structure but also the material of spike-tooth was easy to replace and the threshing effect was good. It provided a reference for the design of spike threshing device in the case of high water cut. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Grain (agricultural product)

Controlled terms: Axial flow? - ?Computer aided analysis? - ?Computer aided engineering? - ?Computer aided software engineering? - ?Computer operating systems? - ?Fruits? - ?Harvesting? - ?Moisture? - ?Moisture determination? - ?Numerical methods

Uncontrolled terms: Agricultural productions? - ?Corn? - ?Discrete element simulation? - ?Distinct element methods? - ?High moisture? - ?Numerical simulation method? - ?Spike-tooth? - ?Threshing

Classification code: 631.1 Fluid Flow, General? - ?723.5 Computer Applications? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods? - ?944.2 Moisture Measurements

Numerical data indexing: Force 2.06e+01N, Force 2.45e+01N, Force 4.55e+01N, Force 5.09e+01N, Mass_Flow_Rate 1.00e+01kg/s, Percentage 1.02e+00%, Percentage 1.02e+01%, Percentage 2.00e+01%, Percentage 2.80e+01%, Percentage 5.30e-01%, Percentage 7.70e-01%, Percentage 8.00e+01%, Percentage 8.03e+00%, Percentage 8.35e+00%, Percentage 9.20e-01%, Percentage 9.84e+00%, Rotational_Speed 3.00e+02RPM, Size 5.50e-02m

DOI: 10.6041/j.issn.1000-1298.2018.S0.034

Compendex references: YES

Database: Compendex

7. Reconstruction of Soil Pore Structure Based on CT Images

Accession number: 20191406729448

Authors: Zhao, Yue (1, 2); Liu, Lei (1, 3); Han, Qiaoling (1, 2); Zhao, Yandong (1, 2)

Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China; (2) Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Municipal Education Commission, Beijing; 100083, China; (3) Key Laboratory of State Forestry Administration for Forestry Equipment and Automation, Beijing; 100083, China

Corresponding author: Zhao, Yandong(yandongzh@bjfu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 401-406

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The geometric and spatial characteristics of soil pores determine the permeability and water retention of soils, which have important effects on soil functional diversity and ecological restoration. However, in the existing research on soil pores, there is a lack of tools and methods for describing intuitive and quantitative characteristics of pores. To solve this problem, the three-dimensional reconstruction technique based on marching cubes algorithm and ray casting algorithm was used to restore the geometry and spatial distribution of soil pores. The objects of experiment were the CT images of soil pores with a single large pore and different pore densities. The comparison results of the two algorithms showed that the pore structures of different sizes reconstructed by MC algorithm had boundary aliasing and missing phenomena, and the pore volume was also smaller than the actual situation. While the RC algorithm reconstructed the pore contour clearly and the structure was real, the detailed information of each pore structure can be completely represented, and the reconstruction effect was not affected by the porous density of the soil sample. In addition, in order to further evaluate the reconstruction performance of the two methods, three indicators of model quality, rendering speed and algorithm characteristics were used to compare and analyze the experimental results. In order to ensure the comparability of the refactoring indicators, all experiments were carried out by using the VTK graphics development library, based on the Visual Studio 2017 programming platform of the same computer. The results showed that the MC algorithm was only for the reconstruction of the pore surface voxels, so it occupied less memory and had faster drawing speed. However, due to the ambiguity of the algorithm, the quality of the reconstructed pore model was general. The RC algorithm calculated all the voxel points of the sample, so it took up a large memory and drew slowly. However, assigning opacity and light intensity were used to each voxel to synthesize the model, avoiding the disadvantages of the MC algorithm, and it was able to maintain the details of the pore model. In summary, the RC algorithm would be able to provide a more advanced method for the visualization of soil pores, laying a technical foundation for studying soil moisture and nutrient transport and air exchange. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Image reconstruction

Controlled terms: Computer programming? - ?Computerized tomography? - ?Pore structure? - ?Rendering (computer graphics)? - ?Restoration? - ?Soil moisture? - ?Soil surveys? - ?Soils

Uncontrolled terms: CT Image? - ?Ecological restoration? - ?Marching cube? - ?Marching Cubes algorithm? - ?Quantitative characteristics? - ?Ray casting? - ?Spatial characteristics? - ?Three-dimensional reconstruction

Classification code: 483.1 Soils and Soil Mechanics? - ?723.1 Computer Programming? - ?723.5 Computer Applications? - ?931.2 Physical Properties of Gases, Liquids and Solids

DOI: 10.6041/j.issn.1000-1298.2018.S0.054

Compendex references: YES

Database: Compendex

8. Research Status and Development Trend of Large Self-propelled Sprayer Booms

Accession number: 20191406729521

Authors: Zhuang, Tengfei (1); Yang, Xuejun (1, 2); Dong, Xiang (3); Zhang, Tie (3); Yan, Herong (1); Sun, Xing (3)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha; 410128, China; (3) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China

Corresponding author: Yang, Xuejun(camms@263.net)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 189-198

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: High clearance self-propelled boom sprayer (HCSBS) is a major type of field spraying machine, and spray boom is a key mechanism to realize the stability of spraying work. In recent years, in order to improve the precise spraying level of HCSBS, the structure of spraying boom has been optimized continuously, and the technology of vibration reduction and balance of spraying boom has become more and more mature. Three kinds of truss structures, including plane, triangular space and trapezoid space types of the sprayer were discussed. Main structure parameters of self-propelled sprayer booms at home and abroad were analyzed. Technical status of vibration damping device and intelligent control system were described. Main research results of spray booms on vibration damping, balance and post measurement were summed up. According to statistics, it was concluded that the proportion of sprayers with sprayer span above 20 m was only 6.79%, and spray span between 10 m and 14.9 m accounted for 73.30%, which indicated that Chinese sprayers were mainly small type with shorter and smaller spray boom compared with foreign sprayers, and its large spray machines only accounted for a small proportion. Based on the above researches, main problems of domestic spray booms were analyzed, and development trend of Chinese spray boom was also pointed out, which included structure optimization of spray boom, development of spray boom series products, settlement of multi-stage and multi-point vibration damping mechanism, improvement of self-balance control and monitoring level, and intelligent adjustment of position and posture. The research would provide references for further structure optimization and performance improvement of spray boom in China. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 76

Main heading: Vibration analysis

Controlled terms: Balancing? - ?Damping? - ?Flight control systems? - ?Structural optimization

Uncontrolled terms: Development trends? - ?Post-measurement? - ?Research results? - ?Self-propelled sprayer? - ?Spraying machine? - ?Structure optimization? - ?Vibration reductions? - ?Vibration-damping

Classification code: 601 Mechanical Design? - ?652.3 Aircraft Instruments and Equipment? - ?921.5 Optimization Techniques? - ?931.1 Mechanics

Numerical data indexing: Percentage 6.79e+00%, Percentage 7.33e+01%, Size 1.00e+01m to 1.49e+01m, Size 2.00e+01m

DOI: 10.6041/j.issn.1000-1298.2018.S0.025

Compendex references: YES

Database: Compendex

9. Finite Element Analysis and Experiment on Corn Harvester Frame Based on Load Characteristics

Accession number: 20191406729534

Authors: Ma, Li’na (1, 2); Huang, Xiaomao (1, 2); Song, Zhenghe (3); Mao, Enrong (3); Liang, Fang (1, 2)

Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan; 430070, China; (3) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Mao, Enrong(gxy15@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 288-294

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Corn harvester is a large and complex agricultural machinery. The corn harvester is mainly used to complete the functions of picking, peeling, stalk returning, grain recovery and panicle collection. The connection and support way is complicated between vehicle frame and assembly components. In view of a domestic corn harvester, a set of finite element loading methods applied to the frame was proposed based on the connection mode and load arrangement. Then on the surface of the frame, eight measuring points were chosen to paste the strain gauge, and the frame was loaded by assembling the whole machine. Under two working conditions of no load and full load, the stress of each test point was tested. By comparing and analyzing the finite element calculations and test results, it could be found that the relative error of each points between the finite element analysis values and test values was within 20% except point 1, in addition, the finite element analysis values and test values were in good agreement. Thus, the feasibility of the finite element loading method of the corn harvester was verified. Furthermore, the finite element model could also be used to analyze and evaluate the reasonableness of the load distribution and structural design of the frame. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Finite element method

Controlled terms: Harvesters? - ?Strain gages? - ?Structural design

Uncontrolled terms: Assembly component? - ?Corn harvesters? - ?Frame? - ?Load characteristics? - ?Load distributions? - ?Loading methods? - ?Measuring points? - ?Relative errors

Classification code: 408.1 Structural Design, General? - ?821.1 Agricultural Machinery and Equipment? - ?921.6 Numerical Methods? - ?943.1 Mechanical Instruments

Numerical data indexing: Percentage 2.00e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.038

Compendex references: YES

Database: Compendex

10. Control Strategy and Startup Method of Extended Range Electric Tractors

Accession number: 20191406729460

Authors: Wang, Limian (1, 2); Wang, Shumao (1); Song, Zhenghe (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Automotive Technician College, Beijing; 102606, China

Corresponding author: Wang, Shumao(wangshumao@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 486-491

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Energy conservation and emission reduction is an important task in the research field of green agricultural machinery. Tractors are the main agricultural driving forces but the emission is a major problem. In particular, there are many small and medium tractors which have a large number of emissions. Electric tractors are new research hotspots, especially suitable for small plots, greenhouses and hilly areas. One of the problems of electric tractors is that the work mileage is short and the temporary charging is inconvenient. So the extended range electric tractors are derived,that is to add a range extender made up of a diesel engine and generator to extend the tractor working time in time. The control strategy of extended range electric tractors was studied, and a forward predictive control model of the motor power was proposed. The modeling and simulation research was carried out. Through the comparison and analysis, it was found that the introduction of the forward predictive control model can improve the following of low speed, the response of acceleration and the starting characteristics of the range extender at high speed. At the same time, when the descending gradient of the motor power demand was very large, the prediction of power lag can be beneficial to the stable operation and smooth unloading of the range extender. Then from the angle of optimization and calibration of the engine startup control strategy, the test research and analysis were carried out on the startup ride comfort, the success rate and the energy consumption of the range extender, and the method of startup control and the optimum drag speed (1 000 r/min) were determined by improving the speed of the dragging target, the exit time of the motor drive and the optimization of the fuel injection, so that the ride comfort and the startup success rate were obviously improved, and the startup energy consumption was reduced. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Tractors (agricultural)

Controlled terms: Agriculture? - ?Diesel engines? - ?Electric drives? - ?Emission control? - ?Energy utilization? - ?Model predictive control? - ?Tractors (truck)? - ?Unloading

Uncontrolled terms: Comparison and analysis? - ?Control strategies? - ?Electric tractors? - ?Energy conservation and emission reductions? - ?Model and simulation? - ?Predictive control models? - ?Stable operation? - ?Starting characteristic

Classification code: 451.2 Air Pollution Control? - ?525.3 Energy Utilization? - ?612.2 Diesel Engines? - ?663.1 Heavy Duty Motor Vehicles? - ?691.2 Materials Handling Methods? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Numerical data indexing: Rotational_Speed 1.00e+03RPM

DOI: 10.6041/j.issn.1000-1298.2018.S0.066

Compendex references: YES

Database: Compendex

11. Performance of Straw Returning Equipment under Different Mechanized Straw Returning Pattern in Northeast Rice Area

Accession number: 20191406729506

Authors: Sun, Nina (1); Wang, Xiaoyan (1); Li, Hongwen (1); Peng, Xianlong (2); Wang, Jiang (1); Wang, Qingjie (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Resources and Environment, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Wang, Xiaoyan(xywang@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 68-74 and 154

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Rice straw returning to the field is an effective way to improve fertility and increase yield. However, the large amount of straw, low water content during harvesting and the difficulty in chopping and scattering all have a negative effects on straw returning, moreover reduce the quality of tillage and transplanting operations in the northeast rice area. It is urgent to investigate a suitable straw returning pattern, improve the quality of straw returning and tillage operations and support the application of rice straw returning technology in the northeast rice area. Aiming to solve these problems, a two-year straw returning experiment was carried out in Qixing Farm in Heilongjiang Province. Four treatments were taken into consideration, including CK (no straw returning, autumn plowing + spring puddling), returning treatment 1 (straw returning, autumn plowing + spring puddling), returning treatment 2 (straw returning, autumn plowing, autumn rotary + spring leveling), and returning treatment 3 (straw returning, autumn rotation buried + spring leveling). Matching equipment was selected for the different patterns and the effects of straw returning and tilling were measured. The two-year experiment showed that all the three straw returning patterns could realize the full amount straw returning, and conditions of soil surface after straw returning could meet the requirement of rice transplanting, in other words it could ensure the quality of rice transplanting and greening up. It could be concluded that returning treatment 3 had a better performance, which meant that it could achieve better surface flatness, slurry degree and vegetation coverage. Two-year experiment results showed that compared with returning treatment 1, treatment 2 did not significantly improve the soil conditions before rice transplanting, although rotation was added in autumn and leveling replaced stirring in spring. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Agriculture

Uncontrolled terms: Full amount straw returning? - ?Low water-content? - ?Matching equipment? - ?Northeast rice area? - ?Rice greening up? - ?Surface flatness? - ?Vegetation coverage? - ?Working performance

Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control

DOI: 10.6041/j.issn.1000-1298.2018.S0.010

Compendex references: YES

Database: Compendex

12. Detection of Obstacles Based on Information Fusion for Autonomous Agricultural Vehicles

Accession number: 20191406729501

Authors: Xue, Jinlin (1); Dong, Shuxian (1); Fan, Bowen (1)

Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 29-34

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming at the limitations of single sensor in environment perception for intelligent vehicles, a method of detecting obstacles based on information fusion from camera and laser radar was proposed for autonomous agricultural vehicles. For the images captured from monocular camera, significance detection was carried out by using Ft algorithm and the significance images were generated. Meanwhile, cluster analysis based on data correlation assessment was conducted for reflection data points from laser radar to determine the priori information such as the number, boundary and location of obstacles. Then the pixel points corresponding to the laser radar data points were regarded as the seed points, and the significance images generated were activated by the seed points. Lastly, the region segmentation based on the region growth method was implemented to obstacles. The experimental results showed that the image significance detection based on Ft algorithm had a better edge detection effect, and the region growth method based on the seed points can effectively segment the obstacles. The information fusion of machine vision and laser radar can better eliminate the interference of non-obstacles and achieve the complete detection of obstacles. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Autonomous vehicles

Controlled terms: Agriculture? - ?Cameras? - ?Cluster analysis? - ?Edge detection? - ?Image segmentation? - ?Information fusion? - ?Obstacle detectors? - ?Optical radar? - ?Radar reflection

Uncontrolled terms: Autonomous agricultural vehicles? - ?Data correlations? - ?Environment perceptions? - ?Obstacle detection? - ?Priori information? - ?Region growth? - ?Region segmentation? - ?Significance analysis

Classification code: 716.2 Radar Systems and Equipment? - ?723 Computer Software, Data Handling and Applications? - ?742.2 Photographic Equipment? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?903.1 Information Sources and Analysis

DOI: 10.6041/j.issn.1000-1298.2018.S0.005

Compendex references: YES

Database: Compendex

13. Navigation Line Detection for Greenhouse Carrier Vehicle Based on Fixed Direction Camera

Accession number: 20191406729498

Authors: Li, Tianhua (1, 2); Wu, Zenghao (1); Lian, Xiankun (1); Hou, Jialin (1, 2); Shi, Guoying (1, 2); Wang, Qi (1)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 8-13

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: To solve the key prerequisite of greenhouse carrier vehicle navigation, a new navigation method was proposed based on fixed direction camera. A pan-tilt camera was constructed to collimate the vision line to corridor’s center line with geomagnetic sensor and digital servo. The angle error was detected by geomagnetic sensor and the error was compensated by servo. The drawback of Hough transform was avoided by using new method of picture processing. The vision system ran in Raspberry Pi based on OpenCV in Linux. It distinguished corridor and crop by value of hue instead of Excess-Green method and the end point of corridor was got by area of screening. By using the Ackerman principle, the vehicle’s position and attitude angle can be received. The dynamic response was got by modeling the equation of vehicle and simulating the movement of vehicle at different vehicle speeds. The experiment was done in real greenhouse which was divided into two parts, including the static experiment and dynamic experiment. The error of navigation information was obtained by processing the picture in fixed platform and a control experiment with Hough transform. The vehicle can drive automatically at different speeds in greenhouse. The results showed that the average time cost of this method was less than 240 ms/f, the average detection error of the navigation line was 2.4 cm, and the long-focus camera can reduce the error by 25.7%, which indicated that the method was available to get navigation line with appropriate accuracy and instantaneity. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Fixed platforms

Controlled terms: Cameras? - ?Computer operating systems? - ?Errors? - ?Geomagnetism? - ?Greenhouses? - ?Hough transforms? - ?Image processing? - ?Kinematics? - ?Navigation? - ?Vehicles

Uncontrolled terms: Control experiments? - ?Dynamic experiment? - ?Geomagnetic sensors? - ?Kinematic simulations? - ?Navigation in formation? - ?Pan-tilt camera? - ?Static experiments? - ?Vision navigation

Classification code: 481.3.2 Earth Magnetism and Terrestrial Electricity? - ?511.2 Oil Field Equipment? - ?742.2 Photographic Equipment? - ?821.6 Farm Buildings and Other Structures? - ?921.3 Mathematical Transformations? - ?931.1 Mechanics

Numerical data indexing: Percentage 2.57e+01%, Size 2.40e-02m

DOI: 10.6041/j.issn.1000-1298.2018.S0.002

Compendex references: YES

Database: Compendex

14. Cab Thermal Comfort Assessment of High-power Tractor

Accession number: 20191406729458

Authors: Yang, Xiao (1, 2); Mao, Enrong (1, 2); Zhang, Jianshun (3); Song, Zhenghe (1, 2); Jin, Xiaoping (1, 2); Du, Yuefeng (1, 2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, Beijing; 100083, China; (3) College of Engineering and Computer Science, Syracuse University, Syracuse; NY; 13244, United States

Corresponding author: Mao, Enrong(gxy15@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 470-476

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: With the dramatically growing use of agricultural high-power tractors, comfort of cab is an important problem in China. Because of the indirect impact with low comfort of the cab, the productivity is restricted. Health of tractor drivers was also undermined by low comfort of the cab. According to the least energy principle, the factors of comfort cab were defined. One of them was the thermal comfort. The simulation and dynamic assessment of comfort tractor cab were studied. The results showed that during the whole period of cooling process, the wind speed was 0.2 m/s which was accorded with the comfort demands and the minimum of temperature in the cab was 18. Firstly, the governing equations that contained CFD and thermal comfort assessment equations were deduced. The equation temperature and the monitor temperature were less different so that comfort zone theory could be used in cab thermal comfort design. In order to get the best value of parameters, the orthogonal simulation test was used. The speed and temperature of wind were significant to the cooling effects and the angel was not significant to the cooling effects according to the simulation results. The temperature of head zone began to decline at 41 s initially and went into the comfort zone firstly. At 10 min during the cooling period, each limb of tractor driver felt comfort and the most comfortable was at 21 min. This cooling result could be set default value in intelligent control system. After 50 min, the temperature of tractor cab would be into the uncomfortable cold zone if cooling was continued. Then the dynamic comfort process was calculated by predicted mean vote and predicted percentage dissatisfied. Because the predicted mean vote was declined rapidly, the feeling of drivers became better rapidly. Predicted percentage dissatisfied declined firstly and ascended after 50 min. It was showed that the comfort feeling was in a time segment if cooling was continued. The assessment results also confirmed the correctness of the simulation results. The simulation results also provided certain reference basis for intelligent temperature control and air cleaning design of high-power tractor cab. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Thermal comfort

Controlled terms: Air cleaners? - ?Cooling? - ?Tractors (agricultural)? - ?Tractors (truck)? - ?Wind

Uncontrolled terms: Cooling effects? - ?Dynamic assessment? - ?Governing equations? - ?Least energy? - ?Mean vote? - ?Percentage dissatisfied? - ?Predicted mean vote? - ?Simulation tests

Classification code: 443.1 Atmospheric Properties? - ?451.2 Air Pollution Control? - ?641.2 Heat Transfer? - ?643 Space Heating, Ventilation and Air Conditioning? - ?663.1 Heavy Duty Motor Vehicles

Numerical data indexing: Time 1.26e+03s, Time 3.00e+03s, Time 4.10e+01s, Time 6.00e+02s, Velocity 2.00e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.064

Compendex references: YES

Database: Compendex

15. Design and Numerical Simulation Analysis of Orchard Fertilizer Mixer

Accession number: 20191406729520

Authors: Song, Yuepeng (1, 2); Zhang, Shuai (1, 2); Li, Tianhua (1, 2); Gao, Dongsheng (3); Fan, Guiju (1, 2); Wang, Wei (1, 2)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China; (3) College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an; 271018, China

Corresponding author: Gao, Dongsheng(dsgao219@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 181-188

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In view of the shortage of water resources in China, the question of low solubility of water-soluble fertilizers, and the uniformity of water-fertilizer mixing in fertigation, an efficient dynamic fertilizer mixer was designed, and the mixing device of the fertilizer device was simulated by using ANSYS simulation software. The mode and stress strain simulation analysis of the mixer was carried out. At the same time, based on Fluent module, the flow field and velocity field of mixing process of the fertilizer mixer were simulated and analyzed. The results showed that the safety factor was 11.95, the lowest order modal main frequency was 19.13 Hz, and each frequency was much larger than the frequency of excitation source of mixed fertilizer. It showed good vibration characteristics and fully met the industrial design requirements. In addition, the distribution diagram of the flow field of different stirring speeds was analyzed. The velocity vector distribution of the mixer was more complex in the rotating stirring process under the rotating speed of the critical agitation speed. It was easy to produce more spoiler and turbulence in the mixer, and can effectively improve the effect of mixing. Meanwhile, the increase of stirringspeed had little effect on the flow field distribution inside the mixer. Finally, the best stirring speed was 600 r/min, which reduced the energy consumption while achieving good mixing effect. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Mixers (machinery)

Controlled terms: Computer software? - ?Energy utilization? - ?Fertilizers? - ?Flow fields? - ?Mixing? - ?Modal analysis? - ?Orchards? - ?Product design? - ?Safety factor? - ?Velocity ? - ?Water resources

Uncontrolled terms: Distribution diagram? - ?Fertigations? - ?Flow field analysis? - ?Flow field distribution? - ?Numerical simulation analysis? - ?Velocity vector distribution? - ?Vibration characteristics? - ?Water-soluble fertilizers

Classification code: 444 Water Resources? - ?525.3 Energy Utilization? - ?631.1 Fluid Flow, General? - ?723 Computer Software, Data Handling and Applications? - ?802.3 Chemical Operations? - ?804 Chemical Products Generally? - ?821.3 Agricultural Methods? - ?913.1 Production Engineering? - ?914.1 Accidents and Accident Prevention? - ?921 Mathematics

Numerical data indexing: Frequency 1.91e+01Hz, Rotational_Speed 6.00e+02RPM

DOI: 10.6041/j.issn.1000-1298.2018.S0.024

Compendex references: YES

Database: Compendex

16. Simulation Analysis of Gas-Solid Two Phase Flow in Pneumatic Conveying Fertilizer Feeder of Rice Fertilizer Applicator

Accession number: 20191406729519

Authors: Li, Liwei (1); Meng, Zhijun (1); Wang, Xiaoou (2); An, Xiaofei (1); Wang, Pei (1); Wu, Guangwei (1)

Author affiliation: (1) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (2) Science and Technology Information Center, General Administration of Agriculture and Reclamation of Heilongjiang, Harbin; 150030, China

Corresponding author: Wu, Guangwei(wugw@nercita.org.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 171-180

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The computational method of fluid dynamics and discrete element method were used to study the air-solid flow of a fertilizer air mixing chamber in a synchronous deep fertilization unit. In this model, the fertilizer particles were simulated by EDEM software, and the gas phase was demonstrated by ANSYS Fluent software. The movement rule of gas and fertilizer was analyzed by studying the influence of throat area, throat length, gas inlet pressure and fertilizer removal rate. The simulation results showed that the cross-section performance of the gas-fertilizer mixing chamber with type 2 throat was good, the pressure loss in the throat was small, and the air velocity was the fastest. The throat area and the fertilizer particle flow entrance pressure mainly affected the airflow velocity and the axial speed of the mixing chamber. The movement of fertilizer particles was less affected by mixing throat length and feed rate of fertilizer. The increase of throat cross-sectional area led to the decrease of airflow velocity and pressure loss in a certain range. With the increase of air inlet pressure, the resultant force and velocity of fertilizer particles were increased, and the suitable inlet air pressure was from 450 Pa to 550 Pa. The results showed that the CFD-EDM coupling method was reliable as an analytical tool for understanding the movement of fertilizer particles in airflow field, and the numerical simulation of fertilizer particle movement based on CFD-EDM coupling method can provide a theoretical basis for the development of rice lateral deep fertilization device. It had guiding significance for the optimization and improvement of the existing pneumatic rice fertilizer applicator. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Two phase flow

Controlled terms: Air? - ?Applicators? - ?Computational fluid dynamics? - ?Fertilizers? - ?Gases? - ?Mixing? - ?Numerical methods? - ?Pneumatics? - ?Velocity

Uncontrolled terms: Air supply? - ?Gas solid two phase flow? - ?Gas-solid couplings? - ?Mixing chamber? - ?Rice fertilization

Classification code: 601 Mechanical Design? - ?631.1 Fluid Flow, General? - ?632.3 Pneumatics? - ?723.5 Computer Applications? - ?802.3 Chemical Operations? - ?804 Chemical Products Generally? - ?921.6 Numerical Methods

Numerical data indexing: Pressure 4.50e+02Pa to 5.50e+02Pa

DOI: 10.6041/j.issn.1000-1298.2018.S0.023

Compendex references: YES

Database: Compendex

17. Seedling Quality Evaluation and Experiments of Cucumber Plug Seedlings for Mechanical Transplantation

Accession number: 20191406729507

Authors: Liu, Yang (1, 2); Mao, Hanping (1, 3); Xu, Jingyun (1, 3); Shen, Baoguo (1, 3); Han, Lühua (1, 3); Li, Yaxiong (2)

Author affiliation: (1) Key Laboratory of Modern Agricultural Equipment and Technolog, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China; (2) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi; 832000, China; (3) High-tech Key Laboratory of Agricultural Equipment & Intelligentization of Jiangsu Province, Zhenjiang; 212013, China

Corresponding author: Mao, Hanping(maohp@ujs.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 75-82 and 163

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Automatic transplanters can improve the transplanting efficiency of vegetable seedling plugs, which are widely applied and valued in production. However, the transplantation of automatic transplanters is limited by pick-up failure or root lump destruction. To get plug seedling quality suitable for mechanical transplantation, orthogonal experiments targeting at cucumber plug seedlings and involving factors of substrate composition (ratios of sphagnum peat moss to perlite and vermiculite volume were 2:1:1, 3:1:1 and 4:1:1), substrate compaction (ratios of substrate to pore volume were 1.0, 1.2 and 1.4) and liquid fertilizer concentration (EC values were 1.0 mS/cm, 1.2 mS/cm and 1.4 mS/cm) were conducted. The cucumber plug seedlings were compressed or drawn by using a texture analyzer to test the compressive resistance and plug abscission force. The stem thickness, plant height, dry root weight and dry stem weight were measured, and the growing quality was evaluated using a sound seedling index. Root lumps were scanned by an X-ray micro-computed tomography (μCT). Roots were isolated from root lumps by using a threshold segmentation method and three-dimensionally reconstructed. The roots were divided into five equal parts vertically and six equal parts horizontally; the ratio of root volume in each part to the volume of root lump in this zone was defined as the root density. Then the root volume and density were statistically analyzed. It was found that the compressive resistance and plug abscission force were both significantly affected by the substrate composition and substrate compaction. Both compressive resistance and plug abscission force were improved with the rise of sphagnum peat moss concentration or compaction degree. The sound seedling index was firstly increased and then decreased with the rising concentration of sphagnum peat moss in the substrate, compaction and fertilization concentration. Vertically, the ratio of minimum to maximum root distribution densities was defined as the root uniformity degree, which was used to evaluate the root uniformity. Horizontally, the peripheral root distribution density was used to evaluate the lump enveloped degree. Clearly, substrate composition, compaction and fertilization concentration all significantly affected the root uniformity coefficient and root enveloping coefficient. Multi-object optimization of compressive resistance, plug abscission force, sound seedling index, root uniformity and peripheral root distribution density were conducted via a comprehensive scoring method, which identified the optimal three-factor combination were substrate composition of 3:1:1, substrate compaction of 1.2 and liquid fertilizer EC value of 1.2 mS/cm. Experiments on automatic pick-up transplanter showed at the frequency of clamping seedlings were 43 plants/min, 48 plants/min and 53 plants/min, the root lump destruction rates were 3.6%, 3.9% and 4.3%, respectively, the pick-up success rates were 97.2%, 96.1% and 94.8%, respectively, which were better than other factor combinations and consistent with the comprehensive scoring result. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Quality control

Controlled terms: Agricultural machinery? - ?Compaction? - ?Computerized tomography? - ?Fertilizers? - ?Forestry? - ?Peat? - ?Pickups? - ?Seed? - ?Textures? - ?Transplants

Uncontrolled terms: Compressive resistance? - ?Evaluation? - ?Multi-object optimization? - ?Orthogonal experiment? - ?Plug seedling? - ?Substrate composition? - ?Threshold segmentation? - ?X ray micro-computed tomography

Classification code: 462.4 Prosthetics? - ?524 Solid Fuels? - ?723.5 Computer Applications? - ?804 Chemical Products Generally? - ?821.1 Agricultural Machinery and Equipment? - ?821.4 Agricultural Products? - ?913.3 Quality Assurance and Control

Numerical data indexing: Electrical_Conductivity 1.00e-01S/m, Electrical_Conductivity 1.20e-01S/m, Electrical_Conductivity 1.40e-01S/m, Percentage 3.60e+00%, Percentage 3.90e+00%, Percentage 4.30e+00%, Percentage 9.48e+01%, Percentage 9.61e+01%, Percentage 9.72e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.011

Compendex references: YES

Database: Compendex

18. Effect of Straw Returning Manners on Seedbed Soil Physical Properties and Winter Wheat Growth

Accession number: 20191406729505

Authors: Zhao, Hongbo (1); He, Jin (1); Li, Hongwen (1); Wang, Qingjie (1); Li, Wenying (1); Liu, Wenzheng (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: He, Jin(hejin@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 60-67

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In the double cropping area of North China Plain, the straw amount is huge as a result of the tremendous grain production, therefore, the maize straw needs proper handling during wheat seeding for the good of soil health and wheat grown. In order to address this issue, a field experiment was conducted in the experimental station at Zhuozhou, Hebei Province in 2016-2018, the effects of straw returning position on the seedbed physical properties of soil moisture content, soil temperature, soil aggregate size distribution, percentage emergence and yield of winter wheat were studied. Four treatments were investigated, including straw mixture (SM), half straw mixture (HSM), straw cover (SC) and controlled check of no straw returning (CK). Experiment results showed that straw return could: increase seedbed soil moisture content at 0~30 cm, SC and HSM had significant increasing effect while SM had not, which was even lower than CK at 0~10 cm depth in 2016; increase seedbed soil water stable macroaggregates, SM, HSM, SC all showed significant effect and macroaggregates were increased by 6.3, 4.9 and 4.8 percentage points, respectively; mitigate soil temperature change, soil temperature of CK at noon was significantly higher than the straw returning treatments, indicating that straw return could lead to slower warm up of soil which was not good for wheat growth; increase percentage emergence of winter wheat, the order from high to low was HSM, SC, SM and CK, and percentage emergence was increased by 40.1%, 34.1%, 14.8%, respectively, however, only HSM showed significant effect, besides SM was significantly lower than HSM in 2016; increase winter wheat yield by 17.2%, 10.9% and 2.9% of SC, HSM and SM, respectively. It could be concluded that straw returning, although impacted soil temperature, it could increase soil water content, improve soil structure and soil health, thus ultimately increasing winter wheat yield. Among the three straw returning treatments, SC obtained the highest yield, then HSM of half straw mixture. SM of straw mixture obtained the highest water stable macroaggregates, but nonetheless the soil moisture and percentage emergence of it was the least, besides it had a certain impact on soil temperature, thus leading to the lowest yield of the three treatments, therefore straw returning positions of SC and HCM were more recommended. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 35

Main heading: Soil surveys

Controlled terms: Crops? - ?Lead removal (water treatment)? - ?Mixtures? - ?Moisture determination? - ?Size distribution? - ?Soil moisture? - ?Temperature

Uncontrolled terms: Percentage of emergence? - ?Seedbed? - ?Soil temperature? - ?Winter wheat? - ?Yield

Classification code: 445.1 Water Treatment Techniques? - ?483.1 Soils and Soil Mechanics? - ?641.1 Thermodynamics? - ?821.4 Agricultural Products? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements

Numerical data indexing: Size 0.00e+00m to 3.00e-01m, Percentage 1.09e+01%, Percentage 1.48e+01%, Percentage 1.72e+01%, Percentage 2.90e+00%, Percentage 3.41e+01%, Percentage 4.01e+01%, Size 0.00e+00m to 1.00e-01m

DOI: 10.6041/j.issn.1000-1298.2018.S0.009

Compendex references: YES

Database: Compendex

19. Design of Fertilizer Spraying Device of Pneumatic Variable-rate Fertilizer Applicator for Rice Production

Accession number: 20191406729518

Authors: Qi, Xingyuan (1); Zhou, Zhiyan (2); Lin, Shuyun (1); Xu, Liang (1)

Author affiliation: (1) Guizhou Research Institute of Mountain Agricultural Machinery, Guiyang; 550002, China; (2) College of Engineering, South China Agricultural University, Guangzhou; 510642, China

Corresponding author: Xu, Liang(18167087@qq.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 164-170 and 180

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Although it is the main machine in rice fertilizer with large width and high efficiency, centrifugal disc type fertilizer spreader is still with the problem of poor uniformity of fertilizer and difficult to realize the control of variable rate fertilization in width direction. In order to adapt to the development of precise agriculture and meet the requirements of rice variable fertilization at the same time, which could make fertilizer reduced and yields for rice increased, a kind of variable pneumatic fertilizer applicator was designed. The machinery not only met the requirements of width, but also achieved the variable rate fertilization in width direction. The fertilizer spraying device which designed for the machine of fertilizer was analyzed theoretically, and a simulation analysis of air flow field was also made for the spraying device with different baffle structures. What’s more, relevant tests of fertilization uniformity were made for fertilizing amount of each row of fertilizer and fertilizer spraying device of different baffle types within their respective scope of fertilization at different rotational speeds. The results showed that revolving speed had no significant effect on fertilizing amount of each row of fertilizer, and fertilizing amount error of each row of fertilizer was within 5% of the average. However, revolving speed and baffle types of fertilizer spraying device had significant effect on fertilization uniformity within the scope of single spraying device, taking the fertilization variation coefficient as index, the whole fertilizer ejecting uniformity variation coefficient was superior to the other speed when the wheel speed was around 30 r/min; on the other hand, the fertilization uniformity variation coefficient of the cone baffle spraying device was superior to the other spraying device whatever the wheel speed was, and when the wheel speed was more than 30 r/min, the fertilization uniformity variation coefficient of this spraying device was less than 8%. In addition, some comparison was made on the influence of different baffle structure on air flow field and fertilization uniformity, some similarities of them were found, but the conclusion whether the air flow field had significant effect on fertilization uniformity cannot be made. Above all, in order to make the single spraying device have the better fertilization uniformity in the process of actual operation, the cone baffle spraying device can be used, on the premise of knowing the weight of target area for fertilization, adjusting the speed of the machine to make the rotated speed of the wheel achieve 30 r/min or more, on this account, good fertilization uniformity can be obtained in this area. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Fertilizers

Controlled terms: Air? - ?Applicators? - ?Flow fields? - ?Machinery? - ?Pneumatics? - ?Speed? - ?Wheels

Uncontrolled terms: Fertilizer spreaders? - ?Out-fluted of fertilizer apparatus? - ?Rice fields? - ?Simulation analysis? - ?Variable fertilizations? - ?Variable rate fertilization? - ?Variable rate fertilizer applicators? - ?Variation coefficient

Classification code: 601 Mechanical Design? - ?601.2 Machine Components? - ?631.1 Fluid Flow, General? - ?632.3 Pneumatics? - ?804 Chemical Products Generally

Numerical data indexing: Percentage 5.00e+00%, Percentage 8.00e+00%, Rotational_Speed 3.00e+01RPM

DOI: 10.6041/j.issn.1000-1298.2018.S0.022

Compendex references: YES

Database: Compendex

20. Design and Experiment of Pneumatic Seeding System of Teff Seeder

Accession number: 20191406729510

Authors: Zhao, Jinhui (1); Liu, Lijing (2, 3); Yang, Xuejun (2, 3); Du, Jiawei (1); Zhao, Zhengbin (2, 4)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China; (3) Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha; 410128, China; (4) National Engineering Laboratory for Agricultural Production Machinery and Equipment, Beijing; 100083, China

Corresponding author: Yang, Xuejun(camms@263.net)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 101-107

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Teff is one of Ethiopia’s most important cereal crops. It is grown by about six million households on approximately 2.2 million hectares or 30% of the land area under cereal production. In Ethiopia, teff is mainly produced by smallholder farmers in a traditional way, and it is a very laborious process, both pre- and post-seeding. In order to solve the problem of Ethiopia teff mechanization seeding, a pneumatic seeding system of teff seeder was designed. The system mainly included seed-metering device, air delivery tube for seeds, distributor, fan and so on. The seed-metering device, air delivery tube for seeds, distributor was designed and analyzed, and the key parameters of pneumatic seeding system were got. The fan was selected by the key parameters, and the pneumatic seeding system experiment platform was set. The quadratic regression general rotation combination design was used for the experiment and the inlet wind speed of air delivery tube and seeding rate were taken as the influential factors. The stability variability coefficient of the full seeding quantity and the consistency variability coefficient of row seeding quantity were measured and analyzed. Through the analysis of variance and response surface analysis by Design-Expert software, the mathematical model was optimized and validated. The wind speed was 25.42 m/s and seed rate was 15 kg/hm2, which was optimal parameter combination. The results under the optimized experiment showed that the consistency variability coefficient of row seeding quantity was 4.96% and the stability variability coefficient of the full seeding quantity was 0.98%. The seed damaged rate was 0.12%, and seed uniformity coefficient of variation was 20.4%. The parameters can meet the standard and agronomy requirements. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Seed

Controlled terms: Design? - ?Experiments? - ?Machinery? - ?Pneumatic materials handling equipment? - ?Pneumatics? - ?Surface analysis? - ?Wind

Uncontrolled terms: Coefficient of variation? - ?Experiment platforms? - ?Optimal parameter combinations? - ?Quadratic regression? - ?Response surface analysis? - ?Seed metering devices? - ?Smallholder farmers? - ?Teff seeder

Classification code: 443.1 Atmospheric Properties? - ?632.3 Pneumatics? - ?632.4 Pneumatic Equipment and Machinery? - ?821.4 Agricultural Products? - ?901.3 Engineering Research? - ?951 Materials Science

Numerical data indexing: Percentage 1.20e-01%, Percentage 2.04e+01%, Percentage 3.00e+01%, Percentage 4.96e+00%, Percentage 9.80e-01%, Velocity 2.54e+01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.014

Compendex references: YES

Database: Compendex

21. Investigation on CAN-bus-based Corn Harvester Intelligent Control System

Accession number: 20191406729532

Authors: Zhang, Zhen (1); Chi, Ruijuan (1); Du, Yuefeng (1); Xie, Bin (1); Deng, Xiaojie (1); Han, Keli (2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Chi, Ruijuan(chiruijuan@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 275-281

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: As the main machinery of corn harvest, corn harvester directly affects the operational efficiency and the quality of harvest. In China, the key technology of corn harvest still needs to be broken through and the immature intelligence control technology has low practicability. Thus a design of intelligent control system was presented which was based on CAN-bus and this design would include the following aspects: according to the function of header loss control, seed damage control, grain separation loss control, automatic row-controlled and fault diagnosis,there were nine nodes set up in intelligence control system. The fundamental controller and the intelligent harvest controller were the core of intelligent control system, and intelligent harvest controller was based on the mechanism of harvest loss and multi-parameter joint control strategy to carry out intelligent control of corn harvester. According to the signal sent by the key board, handle, the angle sensor and the automatic row-controlled node, the fundamental controller controlled the manual operation, walking and steering. By analyzing the control signal and referring to SAE J1939, the protocol of application layer was formulated. Aiming at the key control technology of intelligent harvest, the corresponding control strategies were set up, which realized the multi-parameter adaptive joint control, the real-time data acquisition and display, deviation check and the fault diagnosis. The carrying and field experiments proved that control strategy of the system was effective and the system met the requirements of reliability and real-time, and also the strong practicability. The corn harvester had good performance, so it was an effective solution to collect data and control corn harvester. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Controllers

Controlled terms: Control systems? - ?Data acquisition? - ?Failure analysis? - ?Fault detection? - ?Harvesters? - ?Harvesting? - ?Intelligent control? - ?Risk management? - ?Security systems

Uncontrolled terms: Application layers? - ?CAN bus? - ?Control strategies? - ?Corn harvesters? - ?Intelligence control? - ?Joint control? - ?Operational efficiencies? - ?Real time data acquisition

Classification code: 723.2 Data Processing and Image Processing? - ?731.1 Control Systems? - ?732.1 Control Equipment? - ?821.1 Agricultural Machinery and Equipment? - ?821.3 Agricultural Methods? - ?914.1 Accidents and Accident Prevention

DOI: 10.6041/j.issn.1000-1298.2018.S0.036

Compendex references: YES

Database: Compendex

22. Design and Test of Automatic Walking Control System for High Clearance Hydraulic Tracked Vehicle

Accession number: 20191406729456

Authors: Zhu, Chenhui (1, 2); Li, Lianhao (1); Wang, Wanzhang (1, 2); Zhang, Hongmei (1); Zhao, Ming (1)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou; 450002, China; (2) Collaborative Innovation Center of Henan Grain Crops, Zhengzhou; 450002, China

Corresponding author: Wang, Wanzhang(wangwz@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 456-462 and 469

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In response to the demand of unmanned field machinery in the middle and late stages of high-stalk crop growth, the automatic walking control system was designed based on a remote control type of small high clearance hydraulic tracked vehicle. The STM32 controller was taken as control core, and the effective signal was obtained by using sensors such as ranging, contact rod, angular velocity and so on, the system can precisely control the opening and closing time of the hydraulic solenoid valve, so that the crawler vehicle can rotate the corresponding angle, and it can walk in the field according to the growth of crop. In order to obtain the angle of rotation of the tracked vehicle under different offset transitions, the steering model of the tracked vehicle and the standard field offset model were established, and the expression of theoretical angle of tracked vehicle in different corresponding states was deduced. Considering the phenomenon of slippage and slippage when the tracked vehicle was turning, the steering angular speed of the tracked vehicle at different driving speeds was calibrated. The test results showed that the actual steering angular velocity was between 63%~67% of the theoretical steering angular velocity. In order to verify the walking effect of the hydraulic vehicle automatic walking system, the track vehicle passing test of two working modes was carried out on the hard cement road surface, and the track trajectory of the tracked vehicle was accurately measured by using Unistrong G970 multi-frequency GNSS system. The results showed that the two-way mode of the receiver’s phase center turning trajectory was 5.573 m and 5.572 m in counterclockwise travel and 4.704 m and 4.645 m in clockwise walking, respectively, receiver phase center offset was between 0.163 m and 0.285 m. The relative error of turning track radius and actual radius of frame geometric center was between 0.92% and 2.14%. The tracked vehicle had good effect on automatic walking, which provided a reference for the design of automatic walking control system of field self-walking tracked vehicle. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Steering

Controlled terms: Angular velocity? - ?Automobile steering equipment? - ?Control engineering? - ?Control systems? - ?Crops? - ?Hydraulic machinery? - ?Remote control? - ?Solenoid valves? - ?Tracked vehicles

Uncontrolled terms: Angle of rotation? - ?Automatic walking? - ?Corresponding state? - ?Differential positioning? - ?Geometric center? - ?High clearance? - ?Hydraulic pressure? - ?Hydraulic vehicles

Classification code: 619 Pipes, Tanks and Accessories; Plant Engineering Generally? - ?632.2 Hydraulic Equipment and Machinery? - ?662.4 Automobile and Smaller Vehicle Components? - ?663 Buses, Tractors and Trucks? - ?731.1 Control Systems? - ?821.4 Agricultural Products

Numerical data indexing: Percentage 9.20e-01% to 2.14e+00%, Size 1.63e-01m to 2.85e-01m, Size 4.64e+00m, Size 4.70e+00m, Size 5.57e+00m

DOI: 10.6041/j.issn.1000-1298.2018.S0.062

Compendex references: YES

Database: Compendex

23. Improved Design and Experiment on Pickup Unit of Spring-tooth Residual Plastic Film Collector

Accession number: 20191406729535

Authors: Kang, Jianming (1); Peng, Qiangji (1); Wang, Shiguo (2); Song, Yumin (1); Cao, Silin (2); He, Lei (2)

Author affiliation: (1) Shandong Academy of Agricultural Machinery Sciences, Ji’nan; 250100, China; (2) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi; 832000, China

Corresponding author: Wang, Shiguo(362256015@qq.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 295-303

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming at the problems that insufficient contact between ground and pickup attachment of spring-tooth topsoil residual plastic film collector, additional releasing film part and rearranged film-retrieving spring teeth was used to improve the structure of residual plastic film pickup attachment. The conditions for residual plastic film to move on the film-releasing rod teeth were analyzed to determine the scope and arrangement of penetrating angle of film-releasing rod teeth. The film-retrieving spring teeth were kinematically and kinetically analyzed to determine the kinematic equation and motion trail of spring teeth in the process of picking up residual plastic film. According to the design principle of Box-Benhnken experiment, taking the forward speed, penetrating angle of film-releasing rod teeth and rotational speed film-delivering chain harrow as experimental factors and the recovery rate and impurities rate of residual plastic film as response values, based on regression analysis and response surface analysis, a mathematical model between forward speed, penetrating angle of film-releasing rod teeth, rotational speed film-delivering chain harrow and recovery rate and impurities rate of residual plastic film was built and the aforesaid factors and their interactions were analyzed. The result showed that the factors that most affected the recovery rate of residual plastic film were the penetrating angle of film-releasing rod teeth, forward speed and rotational speed film-delivering chain harrow in descending order; and the factors that most affected the impurities rate of residual plastic film were the rotational speed film-delivering chain harrow, penetrating angle of film-releasing rod teeth and forward speed in descending order. Design-Expert software was used to obtain the optimal solution to the regression equation, which showed that when the forward speed, penetrating angle of film-releasing rod teeth and rotational speed film-delivering chain harrow were 5.21 km/h, 30.8° and 236 r/min, respectively, the theoretical maximum recovery rate of residual plastic film and minimum impurities rate of residual plastic film were 91.4% and 3.21%. respectively. Field validation test showed that the recovery rate and impurities rate of residual plastic film under the above parameters were 91.2% and 3.1%, respectively, the error between theoretical and experimental values was less than 3%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Plastic films

Controlled terms: Agricultural machinery? - ?Equations of motion? - ?Pickups? - ?Recovery? - ?Regression analysis? - ?Speed? - ?Surface analysis? - ?Testing

Uncontrolled terms: Experimental factors? - ?Experimental values? - ?Field validation tests? - ?Improved designs? - ?Kinematic equations? - ?Pickup unit? - ?Residual films? - ?Response surface analysis

Classification code: 817.1 Polymer Products? - ?821.1 Agricultural Machinery and Equipment? - ?921.2 Calculus? - ?922.2 Mathematical Statistics? - ?951 Materials Science

Numerical data indexing: Percentage 3.00e+00%, Percentage 3.10e+00%, Percentage 3.21e+00%, Percentage 9.12e+01%, Percentage 9.14e+01%, Rotational_Speed 2.36e+02RPM, Velocity 1.45e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.039

Compendex references: YES

Database: Compendex

24. Theoretical Analysis and Experiment of Picking Cotton with Horizontal Spindle

Accession number: 20191406729527

Authors: Li, Teng (1); Hao, Fuping (2); Han, Zengde (3); Fang, Xianfa (3); Han, Keli (2); Li, Xiaodong (2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China; (3) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Fang, Xianfa(fangxf@caams.org.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 233-238

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The operating efficiency of cotton picker is mainly related to the parameters such as the drum speed of cotton picking head, number of seat pipes and spindle picking speed and speed ratio between drum and spindle is fixed. Horizontal spindle is the core working part of spindle-type cotton picker, and cotton picking is realized by winding cotton wadding at high speed. The spindle picking speed is key factor affecting effect of cotton picking. The spindle picking speed was theoretically analyzed from three aspects which were picking cotton smoothly, winding up a single cotton petal, and the loss of cotton seed throwing away. According to known picking parameters and mechanical properties of cotton, the speed range of picking spindle was estimated to be 3 000~4 000 r/min. In order to verify the range of spindle picking speed obtained by theoretical analysis, a single spindle picking laboratory test device was set up. The single factor test of spindle picking speed was carried out with the indexes of single cotton picking rate, picking time, power consumption and cottonseed rejection rate, which were divided into 1 000 r/min, 2 000 r/min, 3 000 r/min, 4 000 r/min, 5 000 r/min and 6 000 r/min test levels. According to the test results, a multi-index optimization mathematical model was established. Under the conditions of approaching seed cotton speed of 0.2 m/s, cotton seed rejection rate (no more than 2.5%) and cotton seed recovery rate (greater than or equal to 90%), the range of spindle picking speed was 3 600~3 700 r/min, which was consistent with the theoretical analysis and met the requirement of picking summary. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Cotton

Controlled terms: Speed? - ?Winding

Uncontrolled terms: Cotton pickers? - ?Cotton picking? - ?Horizontal spindle? - ?Laboratory test device? - ?Operating efficiency? - ?Rejection rates? - ?Spindle speed? - ?Theoretical analysis

Classification code: 691.2 Materials Handling Methods? - ?821.4 Agricultural Products

Numerical data indexing: Percentage 2.50e+00%, Percentage 9.00e+01%, Rotational_Speed 1.00e+03RPM, Rotational_Speed 2.00e+03RPM, Rotational_Speed 3.00e+03RPM, Rotational_Speed 3.00e+03RPM to 4.00e+03RPM, Rotational_Speed 3.60e+03RPM to 3.70e+03RPM, Rotational_Speed 4.00e+03RPM, Rotational_Speed 5.00e+03RPM, Rotational_Speed 6.00e+03RPM, Velocity 2.00e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.031

Compendex references: YES

Database: Compendex

25. Optimization and Experiment on Bionic Deep-buried Device for Returning Straw in Field

Accession number: 20191406729504

Authors: Lin, Jing (1); Zhang, Tongjia (1); Tian, Yang (1); Gao, Wenying (1); Qi, Lin (1); Li, Baofa (1)

Author affiliation: (1) College of Engineering, Shenyang Agricultural University, Shenyang; 110866, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 50-59 and 67

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the problem of insufficient depth of trenching, low depth of deep-buried, high resistance to trenching in straw returning work, the design of trenching device for pneumatic straw returning to field was optimized. A parameter optimization design of the deep-buried straw was proposed to simulate the front-foot curve of the rake, and the cutting ability of the side cutting edge designed by Archimedes’ helical design was used to cut the soil to complete the trenching operation. Matlab was used to reduce the resistance and consumption during the trenching operation of the bionic part obtained by binarization, expansion and edge coordinate processing of the front foot, and then the discrete element software EDEM was used to design the bionic trencher and the ordinary trencher. The simulations were compared and the simulation results were verified by the soil trough test. The analysis of the test results showed that the simulation trencher can reduce the resistance by 9.48% compared with the ordinary trencher during the trenching process. The quadratic orthogonal rotation combination design of Design-Expert 8.0 software was used in combination with response surface methodology to establish a regression mathematical model for deep burying rate and operating efficiency of the straw, speed of implement advancement, deep burial depth of straw and straw mulching amount. The analysis result showed that the order of the factors affecting the deep burial rate of straw in a descending trend was straw coverage, deep burial depth of straw and tool advancement speed; the effect of each factor on work efficiency was the speed of implement advancement, deep burial depth of straw and straw cover; interaction in depth of straw depth and straw coverage, machine tool speed and straw coverage had a significant impact on work efficiency. After optimization, the optimal working parameters of the trenching device were achieved with deep buried rate weight of 0.7 and work efficiency weight of 0.3. The forward speed of the implement was 1.63 m/s, the deep buried depth was 27.97 cm, and the straw coverage was 340.54 kg/hm2, the depth buried rate of straw was 90.491%, and the working efficiency was 5.4 hm2/h. The analysis result showed that the optimized work effect was in line with the straw agronomy requirements. The research results can provide a theoretical reference and basis for the optimal design of trenching device for deep returning of corn straw. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 32

Main heading: Trenching

Controlled terms: Biomimetics? - ?Bionics? - ?Compressive strength? - ?Curve fitting? - ?Design of experiments? - ?Efficiency? - ?Image processing? - ?Machine tools? - ?MATLAB? - ?Speed

Uncontrolled terms: Deep buried straw returning? - ?Operating efficiency? - ?Parameter optimization? - ?Quadratic orthogonal rotation combination designs? - ?Response surface methodology? - ?Simulation model? - ?Working efficiency? - ?Working parameters

Classification code: 461 Bioengineering and Biology? - ?603.1 Machine Tools, General? - ?619.1 Pipe, Piping and Pipelines? - ?901.3 Engineering Research? - ?913.1 Production Engineering? - ?921 Mathematics? - ?921.6 Numerical Methods

Numerical data indexing: Percentage 9.05e+01%, Percentage 9.48e+00%, Size 2.80e-01m, Velocity 1.63e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.008

Compendex references: YES

Database: Compendex

26. Design and Experiment of Double-layered Reverse Cleaning Device for Axial Flow Combine Harvester

Accession number: 20191406729528

Authors: Fan, Chenlong (1); Cui, Tao (1); Zhang, Dongxing (1); Yang, Li (1); Tian, Congcong (1); Zhong, Xiangjun (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Cui, Tao(cuitao850919@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 239-248

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Due to the existing problems of high loss rate and impurity rate when corn grains are directly harvested by the cleaning device of vertical flow threshing device with high feed volume, a double-layer vibration system with compact structure, strong cleaning ability, good cleaning effect and high reliability was designed. A double-layered independent vibrating cleaning method of corn grain was proposed. The movement law of screen surface and material was determined through analysis, the structural parameters of cleaning screen and double air duct and motion parameters of the transmission mechanism were obtained. Based on three evaluation indicators of the grain impurity rate, grain loss rate and distribution ratio, single-factor tests were conducted on the crank speed to determine the best operating parameters with upper and lower crank speeds of 220 r/min and 190 r/min, respectively. With two factors of crank length of upper and lower screen and three levels of 40 mm, 45 mm and 50 mm, the orthogonal test was carried out to acquire the optimal cleaning results that the crank lengths of upper and lower screen were 50 mm and 40 mm, respectively. Finally, under the above experimental conditions, the results showed that the grain loss rate, grain impurity ratio and grain distribution ratio were 0.45%, 0.76% and 1.92%, respectively, when the feed rate was 8 kg/s, and the cleaning effect of the device was better, which can meet the cleaning performance requirements. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Combines

Controlled terms: Air cleaners? - ?Cleaning? - ?Design? - ?Grain (agricultural product)? - ?Harvesters

Uncontrolled terms: Cleaning devices? - ?Evaluation indicators? - ?Experimental conditions? - ?Grain distribution? - ?Operating parameters? - ?Performance requirements? - ?Structural parameter? - ?Transmission mechanisms

Classification code: 451.2 Air Pollution Control? - ?802.3 Chemical Operations? - ?821.1 Agricultural Machinery and Equipment? - ?821.4 Agricultural Products

Numerical data indexing: Rotational_Speed 2.20e+02RPM, Size 4.00e-02m, Size 4.50e-02m, Size 5.00e-02m, Mass_Flow_Rate 8.00e+00kg/s, Percentage 1.92e+00%, Percentage 4.50e-01%, Percentage 7.60e-01%, Rotational_Speed 1.90e+02RPM

DOI: 10.6041/j.issn.1000-1298.2018.S0.032

Compendex references: YES

Database: Compendex

27. Mechanism Analysis and Experiment Optimization on Parameters of Maize Exciting and Picking

Accession number: 20191406729529

Authors: Wang, Qian (1); He, Ke (1); Jin, Chengqian (1); Lu, Xiufeng (2); Geng, Duanyang (1); Zhang, Guohai (1)

Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255000, China; (2) Shandong Polytechnic College, Jining; 272067, China

Corresponding author: Geng, Duanyang(dygxt@sdut.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 249-257

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The theory of maize ear picking mechanism was studied based on the advantage of high efficiency and low-loss, and the influence of clamping position, vibration frequency and amplitude on the effect of maize ear picking was determined. The shocking spike model was established and the frequency characteristic curve suitable for the high efficiency and low-loss spike of maize was determined. The shocking and snapping experimental table designed by our own project team was adopted, the single factor influence rule of the clamping position, amplitude and frequency on the performance of snapping was carried out, and the parameter range was determined to satisfy the ear picking of corn. Under the condition of clamping position at 10.25~13.25 cm, amplitude at 0.5~1 cm and exciting frequency at 15~18.3 Hz, it had an ideal exciting effect. Based on the single factor test analysis and in order to ensure the best picking effect without breaking the stem, the response surface methodology was uesd to study the change rule of spike removal after coupling parameters. Through response surface ANOVA analysis, the response regression equation of the effect of clamping position, amplitude and frequency on stem breaking rate and picking success rate was obtained. And combined with the response surface image, the specific influence of clamping position, amplitude and frequency on stem breaking rate and picking success rate were obtained. Finally, through parameter optimization, the best parameter combination suitable for maize high efficiency spike removal was determined. When the moisture content of grain was 30.58%, its clamping position was 10.8 cm from the barycentric of the corn era. When the amplitude was 0.6 cm and the excitation frequency was 17.8 Hz. The stem breaking rate of maize was 2%, and the success rate of picking was 98%. The results fully met the technical requirements of corn harvest, and provided theoretical support for the development of corn harvester. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Vibration analysis

Controlled terms: Efficiency? - ?Harvesting? - ?Surface properties

Uncontrolled terms: Corn? - ?Exciting vibration? - ?Frequency characteristic? - ?Mechanism analysis? - ?Parameter combination? - ?Parameter optimization? - ?Response surface methodology? - ?Spiking

Classification code: 821.3 Agricultural Methods? - ?913.1 Production Engineering? - ?951 Materials Science

Numerical data indexing: Frequency 1.50e+01Hz to 1.83e+01Hz, Frequency 1.78e+01Hz, Percentage 2.00e+00%, Percentage 3.06e+01%, Percentage 9.80e+01%, Size 1.03e-01m to 1.33e-01m, Size 1.08e-01m, Size 5.00e-03m to 1.00e-02m, Size 6.00e-03m

DOI: 10.6041/j.issn.1000-1298.2018.S0.033

Compendex references: YES

Database: Compendex

28. Plant Leaf Image Recognition Method Based on Transfer Learning with Convolutional Neural Networks

Accession number: 20191406729543

Authors: Zheng, Yili (1); Zhang, Lu (1)

Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 354-359

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The identification of plant species plays an important role in the research and development of botany. In order to improve the recognition accuracy of plant leaf images, taking into account the plant leaf database as a small sample database, a convolutional neural network plant leaf image recognition method based on transfer learning was proposed. Firstly, the plant leaf image was preprocessed, and the plant leaf image data set was expanded by random horizontal, vertical flipping, and random scaling of the original image. The expanded plant leaf image data set samples were de-averaged and divided into 4:1 proportions as training set and test set. Then, the pre-trained models (AlexNet and InceptionV3) on the large-scale datasets were loaded to the plant leaf image data set. The parameters of all convolution layers of the pre-training models were retained, but the last layer was completely replaced to adapt the task of plant leaf image recognition. Finally, the proposed methods were compared with the support vector machine (SVM) method, the deep belief nets (DBN) method and the convolutional neural network (CNN) method from training time and the accuracy of test set in the ICL database. Tensorflow was used to train the network model in the experiment, and the model was visualized by the Tensorboard. The results showed that the accuracy rate of test set obtained with AlexNet and InceptionV3 pre-training models were 95.31% and 95.40%, respectively, which were better than those with SVM method, DBN method and CNN method. The training time of AlexNet and InceptionV3 pre-training model were 26 220 s and 3 984 s, respectively. The InceptionV3 pre-training model was superior to the AlexNet pre-training model in terms of test set accuracy and training time. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Image enhancement

Controlled terms: Convolution? - ?Database systems? - ?Deep learning? - ?Image recognition? - ?Large dataset? - ?Neural networks? - ?Plants (botany)? - ?Statistical tests? - ?Support vector machines

Uncontrolled terms: Convolutional neural network? - ?Large-scale datasets? - ?Leaf recognition? - ?Plant leaf images? - ?Recognition accuracy? - ?Recognition methods? - ?Research and development? - ?Transfer learning

Classification code: 716.1 Information Theory and Signal Processing? - ?723 Computer Software, Data Handling and Applications? - ?723.3 Database Systems? - ?922.2 Mathematical Statistics

Numerical data indexing: Percentage 9.53e+01%, Percentage 9.54e+01%, Time 2.62e+04s, Time 3.98e+03s

DOI: 10.6041/j.issn.1000-1298.2018.S0.047

Compendex references: YES

Database: Compendex

29. Classification and Identification Method of Multiple Kinds of Farm Obstacles Based on Convolutional Neural Network

Accession number: 20191406729502

Authors: Xue, Jinlin (1); Yan, Jia (1); Fan, Bowen (1)

Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 35-41

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In the process of obstacle avoidance control and path planning of autonomous agricultural vehicles, it is not enough to only detect obstacles. If the obstacles are classified and identified more accurately with types and danger degree, it can be served as an important basis for controlling the speed of agricultural vehicles and planning the trajectory during obstacle avoidance, and it will make the process of obstacle avoidance control and path planning of autonomous agricultural vehicles more accurate and reasonable. A convolutional neural network model was designed to realize the identification of multiple obstacles for unmanned agricultural vehicles. The model included an input level, two convolution levels, two pooling levels, a full connection level and an output level. And databases of human and agricultural vehicles were built according to MIT database and website data respectively. Then, the convolution operation was performed on the training set with 5×5 convolution kernel and the acquired feature graphs were pooled in a 2×2 neighborhood. After the convolution operation with 3×3 convolution kernel and 2×2 neighborhood pooling operation, the network model parameters were obtained by using automatic learning and the optimal network identification model was achieved. The experimental results showed that high recognition accuracy of obstacle identification was obtained, which was 94.2%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Process control

Controlled terms: Agriculture? - ?Autonomous vehicles? - ?Convolution? - ?Distributed computer systems? - ?Intelligent vehicle highway systems? - ?Motion planning? - ?Neural networks

Uncontrolled terms: Agricultural vehicles? - ?Autonomous agricultural vehicles? - ?Classification and identifications? - ?Convolutional neural network? - ?Identification model? - ?Network model parameters? - ?Obstacle avoidance controls? - ?Obstacles

Classification code: 406.1 Highway Systems? - ?716.1 Information Theory and Signal Processing? - ?722.4 Digital Computers and Systems? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Numerical data indexing: Percentage 9.42e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.006

Compendex references: YES

Database: Compendex

30. Automatic Charging of Forage Pushing Robot by Magnetic Stripe Navigation

Accession number: 20191406729497

Authors: Wan, Chang (1, 2); Tan, Yu (1); Zheng, Yongjun (1); Wen, Weisong (1); Yang, Shenghui (1); Li, Baosheng (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Mechanical and Electrical Engineering, Tarim University, Alar; 843300, China

Corresponding author: Tan, Yu(tanyu@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 1-7 and 41

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to realize frequent feeding in cattle farm, automatic charging system of forage push robot adopted upper docking type, and it included charging pile and charging control part of the robot. The charging pile included battery charger, charging circuit and charging electrode. The charging control part of robot included controller, walking driving module, power monitoring module, sensor data acquisition module, relay and charging electrode. A coordinate system XYZ was set up at the charging junction. According to electrode length, electrode compression stroke and electrode width, the fault tolerance range of X, Y and Z axes was determined. According to the working environment of semi-open cattle farm, charging piles and magnetic stripe navigation charging path were set up in automatic charging area. During the navigation of forage pushing robot, magnetic navigation sensor detected magnetic signal, and magnetic navigation deviation was obtained by data processing. A fuzzy PID control was adopted. When the control speeds of the left and right wheels of the forage pushing robot was obtained, the speed value of each wheel was converted to angular velocity value of according motor. The controller outputed PWM signal of corresponding duty ratio to control the rotation speed of motor. Combining with the characteristic and experiment of magnetic navigation sensor, the adjustment rules of output parameters of fuzzy controller was obtained. The results of charging and docking tests by magnetic strip navigation were as follow. When the absolute value |e| of magnetic navigation deviation was the maximum, the maximum value of proportional coefficient adjustment value ΔKp was 1.28, and the minimum value was 1.03. The maximum value of the integral coefficient adjustment value ΔKi was 0.13, and the minimum value was 0.06. The maximum value of differential coefficient adjustment value ΔKd was -1.18, and the minimum value was -1.5. PID controller coefficient can be adaptively corrected by the fuzzy PID control. The maximum docking deviations of magnetic navigation on X axis, Y axis and Z axis were 4.1 cm, 1.9 cm and 0.7 cm, respectively, and the docking deviations were within the fault tolerance range. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Robots

Controlled terms: Charging (batteries)? - ?Controllers? - ?Data acquisition? - ?Data handling? - ?Electrodes? - ?Fault tolerance? - ?Fuzzy control? - ?Magnesium printing plates? - ?Magnetism? - ?Navigation ? - ?Piles? - ?Proportional control systems? - ?Three term control systems? - ?Wheels

Uncontrolled terms: Automatic charging? - ?Automatic charging systems? - ?Differential coefficient? - ?Forage pushing? - ?Fuzzy - pid controls? - ?Magnetic navigation? - ?Magnetic stripes? - ?Working environment

Classification code: 408.2 Structural Members and Shapes? - ?601.2 Machine Components? - ?701.2 Magnetism: Basic Concepts and Phenomena? - ?702.1.2 Secondary Batteries? - ?723.2 Data Processing and Image Processing? - ?731 Automatic Control Principles and Applications? - ?732.1 Control Equipment? - ?745.1.1 Printing Equipment

Numerical data indexing: Size 1.90e-02m, Size 4.10e-02m, Size 7.00e-03m

DOI: 10.6041/j.issn.1000-1298.2018.S0.001

Compendex references: YES

Database: Compendex

31. Improved Design and Experiment of Collector for Corn Whole Plastic Film Mulching on Double Ridges

Accession number: 20191406729537

Authors: Xin, Shanglong (1); Zhao, Wuyun (1); Dai, Fei (1); Wang, Jiuxin (1); Liu, Xiaolong (1); Wu, Zhengwen (2)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou; 730070, China; (2) Wuwei Xingwang Machinery Manufacturing Co., Ltd., Wuwei; 733018, China

Corresponding author: Zhao, Wuyun(zhaowy@gsau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 311-319

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the problems of poor profiling effect, easy congestion, unsatisfactory film collecting and unloading performance of the existing collector machine for corn whole plastic film mulching on double ridges, the improved design of part of profiling elastic tooth and film rolling device of the machine were carried out. The profiling teeth were made up of a plurality of single articulated film tooth and camshafts. Each single articulated film tooth can be modeled individually, and the two adjacent film teeth were arranged in space under the action of camshaft, so as to solve the problem of poor local copying ability, the soil and interference of cuddle film. The film rolling device was made up of driving roller, driven roller and curl-up film roller with variable diameter. Among them, relying on the manual pull rod and the built-in spring, the outer contour diameter of curl-up film roller was achieved. The optimized movable blade can ensure that its outer contour was a closed cylinder through the engagement of the inner and outer teeth. And the outer ring of the driven roller was installed with the conveyer teeth, so that the whole roll film device can operate more smoothly in the work, and the curl-up film roller with variable diameter can always keep in contact with the driving roller and the driven roller. It avoided the phenomenon that the curl-up film roller with variable diameter stayed on the top of driving and driven roller because of the sudden change of friction force. By analyzing the assembling, throwing and dropping process of the eccentric gear roller, the minimum rotation speed of the eccentric gear roller was determined to be 164.92 r/min. Combined with orthogonal test, taking the recovery rate of plastic film, wrapping rate and soil content as evaluation indexes, the synthetical scored method was used to obtain the order of influence of significant parameters on comprehensive performance of each index when the machine was working as: the forward speed of the machine, reverse scraping diaphragm velocity, eccentric pick film roller velocity and the camshaft velocity. The field experimental results showed that the recovery rate of residual film was 90.26%, the film wrapping rate was 1.94% and the soil content was 25.41%, when the machine speed was 3 km/h, the conveyor roller velocity was 140.4 r/min, camshaft velocity was 130.6 r/min, eccentric pick film roller velocity was 183.6 r/min and reverse scraping diaphragm velocity was 120.8 r/min. The results met the technical requirements of residual film recovery in corn double ridges furrow and provided a reference for the design of residual film recovery equipment. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Rollers (machine components)

Controlled terms: Arid regions? - ?Camshafts? - ?Conveyors? - ?Diaphragms? - ?Friction? - ?Plastic films? - ?Recovery? - ?Soils? - ?Unloading? - ?Velocity

Uncontrolled terms: Comprehensive performance? - ?Corn? - ?Improved designs? - ?Plastic film mulching? - ?Plastic film residues? - ?Profiling? - ?Technical requirement? - ?Variable diameter

Classification code: 443 Meteorology? - ?444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?601.2 Machine Components? - ?691.2 Materials Handling Methods? - ?692.1 Conveyors? - ?817.1 Polymer Products

Numerical data indexing: Percentage 1.94e+00%, Percentage 2.54e+01%, Percentage 9.03e+01%, Rotational_Speed 1.21e+02RPM, Rotational_Speed 1.31e+02RPM, Rotational_Speed 1.40e+02RPM, Rotational_Speed 1.65e+02RPM, Rotational_Speed 1.84e+02RPM, Velocity 8.33e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.041

Compendex references: YES

Database: Compendex

32. Recognition Model of Water-injected Meat Based on Characteristic Spectrum Extraction of Infrared Spectroscopy

Accession number: 20191406729454

Authors: Tang, Ming (1, 2); Tian, Xiaoyu (3); Wang, Xu (1); Xu, Yang (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) School of Transportation, Zhejiang Industry Polytechnic College, Shaoxing; 312000, China; (3) School of Food and Biological Engineering, Jiangsu University, Zhenjiang; 212013, China

Corresponding author: Xu, Yang(xuyang@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 440-446

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Nondestructive testing technology of water-injected meat has developed rapidly, thus a novel method was displayed based on the technical of pattern recognition algorithms, aiming to research a pattern recognition model which combined with spectral analysis technique and support vector machines. Then the examination was designed with the purpose of getting objects’ infrared spectroscopy, these objects were water-injected beefs and the normal beefs. Furthermore, some characteristic spectrum was collected according to the principle of spectral analysis technology in the wavebands of 900~2 200 nm, difference of the two classes of object should be emphasized as the reason of the pattern modeling requirements. So wavelet transform was applied to spectral analysis to obtain the singular value which seemed as the chief actor of the difference between water-injected samples and normal ones, and the next step based on singular value was to extract the feature wavebands from spectroscopy of every class of beef. The feature wavebands that contained common group absorption peak were named base value, the others were optional, and different combinations were carried out by them in the end. Clustering methodology provided characteristic spectrum as another additional factor for such combinations above, they were all target matrix which were prepared for pattern recognition model. Above all, training set and testing set were constructed by using leave-one-out cross validation, the optimum displayed identify outcomes of different combinations, and the value of recognition rate was 90.48%. Much analysis about difference significance test was necessary, and then Mann-Whitney method was used to analyze the significance of recognition rate above, it was showed that the result was significant, and the feature wavebands obtained from clustering analysis took pattern recognition model a higher prediction accuracy, in which, wavebands of 1 818~1 842 nm had great influence. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Pattern recognition

Controlled terms: Extraction? - ?Infrared devices? - ?Infrared spectroscopy? - ?Meats? - ?Nondestructive examination? - ?Spectrum analysis? - ?Statistical methods? - ?Wavelet transforms

Uncontrolled terms: Characteristic spectrum? - ?Leave-one-out cross validations? - ?Near Infrared? - ?Non destructive testing? - ?Pattern recognition algorithms? - ?Prediction accuracy? - ?Provided characteristics? - ?Spectral analysis techniques

Classification code: 802.3 Chemical Operations? - ?822.3 Food Products? - ?921.3 Mathematical Transformations? - ?922.2 Mathematical Statistics

Numerical data indexing: Percentage 9.05e+01%, Size 1.82e-06m to 1.84e-06m, Size 9.00e-07m to 2.20e-06m

DOI: 10.6041/j.issn.1000-1298.2018.S0.060

Compendex references: YES

Database: Compendex

33. Design and Experiment of 3WPZ-4 Type Air-assisted Grape Sprayer

Accession number: 20191406729523

Authors: Dong, Xiang (1); Zhang, Tie (1); Yan, Mingde (1); Yang, Xuejun (1); Yan, Herong (2); Sun, Xing (2)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 205-213

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: To reduce labor intensive, increase pesticides availability and decrease loss and other issues, the 3WPZ-4 type grape sprayer matching on model PT-115 multifunctional self-propelled chassis was developed, which contained the technology of ultrasonic target probe, flexibility discharge pipes air-assisted precision spray and integrated control. The 3WPZ-4 type air-assisted grape sprayer with 1 600 L tank can operate for four rows wine grape at the same time and the designed spray pressure was form 0.5 MPa to 1.0 MPa which adapted to 2.5~3.5 m wine grape row spacing. Four years wine grape pesticides application test showed that the spray water volume of 3WPZ-4 type air-assisted grape sprayer was from 37.4 L/min to 78.7 L/min, droplet median volume diameter was form 132.1 μm to 251.1 μm. Without precision target system and no air-assisted, using 1.2 mm nozzle at 1.0 MPa spray pressure, the minimum pesticides deposition rate was 53.24%, the maximum loss rate was 15.53% and drift rate was 31.23% at spray water volume of 801.2 L/hm2. With air-assisted, using 1.5 mm nozzle at 1.0 MPa spray pressure, the maximum deposition rate was 71.90%, and the minimum drift rate was 15.68% at spray water volume of 1 005.4 L/hm2. Using 1.2 mm nozzle at 0.5 MPa spray pressure with air-assisted, the minimum loss rate was 10.77% at spray water volume of 408.4 L/hm2. Without air-assisted, average pesticides deposition rate was 58.83%, average loss rate was 14.48%, and the average drift rate was 26.69%. With air-assisted, average pesticides deposition rate was 68.94%, average loss rate was 12.08%, and average drift rate was 18.98%. With air-assisted, average pesticides deposition rate was increased by 17.2%, average loss rate was reduced by 16.56%, and average drift rate was lowered by 28.87%. When using precision target system, the average spray water volume error was 2.90%, average pesticides deposition rate was 65.76%, average loss rate was 13.40%, and average drift rate was 20.84%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Spray nozzles

Controlled terms: Deposition rates? - ?Design? - ?Experiments? - ?Pesticides? - ?Wine

Uncontrolled terms: Average loss? - ?Grape sprayer? - ?Labor intensive? - ?Minimum loss? - ?Precision sprays? - ?Spray pressure? - ?Target systems? - ?Wine grapes

Classification code: 631.1 Fluid Flow, General? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?822.3 Food Products? - ?901.3 Engineering Research

Numerical data indexing: Size 1.20e-03m, Size 1.32e-04m to 2.51e-04m, Size 1.50e-03m, Percentage 2.89e+01%, Percentage 2.90e+00%, Percentage 3.12e+01%, Percentage 5.32e+01%, Percentage 5.88e+01%, Percentage 6.58e+01%, Percentage 6.89e+01%, Percentage 7.19e+01%, Pressure 1.00e+06Pa, Pressure 5.00e+05Pa to 1.00e+06Pa, Pressure 5.00e+05Pa, Size 2.50e+00m to 3.50e+00m, Volume 1.60e+00m3, Percentage 1.08e+01%, Percentage 1.21e+01%, Percentage 1.34e+01%, Percentage 1.45e+01%, Percentage 1.55e+01%, Percentage 1.57e+01%, Percentage 1.66e+01%, Percentage 1.72e+01%, Percentage 1.90e+01%, Percentage 2.08e+01%, Percentage 2.67e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.027

Compendex references: YES

Database: Compendex

34. CORS and UHF Based GNSS Differential Signal Relay Method for Agricultural Application

Accession number: 20191406729500

Authors: Wu, Caicong (1, 2); Zhao, Xin (1, 2); Tian, Juan (1, 2); Cheng, Ying (1, 2); Hu, Bingbing (1, 2)

Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Remote Sensing for Agri-Hazards, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 23-28

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: How to use the existing and rich continuous operation reference stations (CORS) resources to provide high precision, high reliability, and high concurrency differential augmentation signals for precision agriculture is still an unsolved problem. Based on the characteristics of agricultural application, a CORS and UHF radio GNSS based differential signal relay scheme was proposed, which can solve the problems such as single transmission mode, lack of concurrency, high cost of using in CORS application, repeated construction, frequency interference and frequency interference existing in single RTK station application. An experimental CORS system with three stations was established. The stations were established in Haidian District, Shunyi District and Pinggu District of Beijing. Three sets of relay test systems based on PC, i80, and Phone were constructed. The positioning performance verification, operation unit control accuracy verification and application prototype verification were carried out respectively. The test result showed that within 10 km, the plane inside and outside accuracy values of relay positioning were better than 0.022 m and 0.033 m, which met the requirements of agricultural machinery operation (usually 0.03 m). The control accuracy of the operation unit reached 0.066 ~0.076 m, slightly higher than 0.050 m. The reliability of the phone based relay system was high, and the system had good expansion. Therefore, by using smart phone and UHF radio, the differential signal of CORS can be easily obtained and transmitted, which can realize RTK positioning by the rover within 10 km. The mode was easy, low cost, and had certain feasibility and application value. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Global positioning system

Controlled terms: Agriculture? - ?Radio transmission? - ?Smartphones

Uncontrolled terms: Auto-steering? - ?Continuously operating reference stations? - ?Differential signal? - ?Global Navigation Satellite Systems? - ?Relay? - ?Ultra-high frequency

Classification code: 716.3 Radio Systems and Equipment? - ?718.1 Telephone Systems and Equipment? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Numerical data indexing: Size 6.60e-02m to 7.60e-02m, Size 1.00e+04m, Size 2.20e-02m, Size 3.00e-02m, Size 3.30e-02m, Size 5.00e-02m

DOI: 10.6041/j.issn.1000-1298.2018.S0.004

Compendex references: YES

Database: Compendex

35. Efficient Variable Irrigation Method Based on Exponential Smoothing Prediction

Accession number: 20191406729546

Authors: Dong, Xin (1); Zhou, Liming (1); Liu, Yangchun (1); Zhang, Junning (1); Wang, Fengzhu (1); Li, Yashuo (1)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Zhou, Liming(haibo1129@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 372-378

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: It is of great practical significance to develop high-efficiency farmland water-saving irrigation technology. Existing irrigation systems lack decision-making guidance, can only achieve uniform irrigation in the field. In order to solve this problem, the ZigBee wireless network was used to do the real-time data acquisition of embedded moisture sensor in paper. And then put forward a variable irrigation data processing method based on the quadratic smoothing prediction algorithm. This method can adjust smooth weight according to the theory value to achieve the optimal prediction data, finally get the variable operation prescription map. The sprinkler machine variable control system was developed here. This system is mainly composed of Siemens s7-200 programmable logic controller, PC, soil water sensor, GNSS position information module, etc. It can adjust the sprinkler machine step by step by simulating the percentage timer, and real-time adjust the walk step length and speed to realize variable irrigation. In order to evaluate the performance of the system, the effect evaluation experiment of traditional irrigation and variable irrigation was carried out. Field contrast test results indicated that variable irrigation operation efficiency was higher than traditional irrigation about 23.19%. The practical application shows that the designed variable irrigation system has good applicability and operability, can significantly improve the irrigation effect, and achieve the purpose of saving water and increasing income. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Sprinkler systems (irrigation)

Controlled terms: Data acquisition? - ?Data handling? - ?Decision making? - ?Efficiency? - ?Forecasting? - ?Moisture control? - ?Soil moisture? - ?Water conservation? - ?Wireless sensor networks

Uncontrolled terms: Exponential smoothing method? - ?Exponential smoothing predictions? - ?Real time data acquisition? - ?Variable control systems? - ?Walking control? - ?Water-saving irrigation? - ?Wireless communications? - ?ZigBee wireless networks

Classification code: 444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?716.3 Radio Systems and Equipment? - ?723.2 Data Processing and Image Processing? - ?731.3 Specific Variables Control? - ?821.1 Agricultural Machinery and Equipment? - ?912.2 Management? - ?913.1 Production Engineering

Numerical data indexing: Percentage 2.32e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.050

Compendex references: YES

Database: Compendex

36. Design and Experiment of Capacitively-coupled Contactless Conductivity Detection Device for Rapid Measurement of Soil Potassium Ion

Accession number: 20191406729544

Authors: Zhang, Junqing (1); Gao, Jun (1); Chen, Xiangyu (1); Wang, Rujing (1); Zhang, Zhengyong (1); Wei, Yuanyuan (1)

Author affiliation: (1) Institute of Intelligent Machine, Chinese Academy of Sciences, Hefei; 230031, China

Corresponding author: Wei, Yuanyuan(yywei@iim.ac.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 360-364 and 392

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: At present study, a capacitively-coupled contactless conductivity detection (C4D) device integrated with capillary electrophoresis was expected to fulfill rapid detection of potassium ion concentration in soil. The device contained a C4D cell and a C4D detector. Firstly, a C4D cell matched with the 360 μm fused quartz capillary was designed. In the C4D cell, a receiving electrode, a shielding electrode and an exciting electrode were constructed by metal cylinder electrode with conductive silver paste. The lengths of the exciting electrode and the receiving electrode were both 10 mm, and the distance between the two electrodes was 2 mm. Secondly, the C4D detector included exciting signal generator circuit, pre-amplifier receiving circuit and detection amplifier circuit. After the potassium ion electrophoresis tests, the optimal excitation signal for soil solution analysis was determined as 136 kHz, 80 V sine wave. Finally, the C4D device was used in preliminary test of the potassium ion contained in six kinds of soil samples. The six national standard soil samples were digested by pure water, and then the solutions were filtered as test samples. The potassium ion test results of the six soil samples tended to correlate with the standard values. The results indicated that the C4D device had potential to complete preliminary tests of actual soil samples. The proposed capacitively-coupled contactless conductivity detection method modulated the soil samples for the first time. The optimized detection method can be used for rapid on-site soil nutrient detection in the future. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Soil surveys

Controlled terms: Capillary electrophoresis? - ?Electrodes? - ?Ions? - ?Potassium? - ?Soil moisture? - ?Soils

Uncontrolled terms: Amplifier circuits? - ?Capacitively coupled contactless conductivity detection? - ?Generator circuits? - ?Optimal excitation? - ?Potassium ion concentration? - ?Potassium ions? - ?Shielding electrodes? - ?Soil nutrient detection

Classification code: 483.1 Soils and Soil Mechanics? - ?549.1 Alkali Metals? - ?701.1 Electricity: Basic Concepts and Phenomena

Numerical data indexing: Frequency 1.36e+05Hz, Size 1.00e-02m, Size 2.00e-03m, Size 3.60e-04m, Voltage 8.00e+01V

DOI: 10.6041/j.issn.1000-1298.2018.S0.048

Compendex references: YES

Database: Compendex

37. Design and Experiment on Plant Seedling Device for Vegetable Seedling Seeder

Accession number: 20191406729508

Authors: Liu, Yunqiang (1); Liu, Lijing (1, 2); Zhao, Zhengbin (3); Zhao, Jinhui (4); Cui, Wei (3)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha; 410128, China; (3) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China; (4) State Key Laboratory of Soil Plant Machinery System Technology, Beijing; 100083, China

Corresponding author: Liu, Lijing(xyliulj@sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 83-91

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the problem of high reseeding rate of sowing non-spherical seeds in vegetable seedling precision seeder, a kind of clearing device was designed, and the structural parameters of the clearing device were optimized through the simulation of flow field in the seed cleaning device. The stress and movement state of seed at the stage of seed absorption were analyzed. Through analysis, two seeds were usually adsorbed when the non-spherical seed was replanted, one of which was mainly sucked and the other seed was the secondary. Eggplant seeds were used as sowing seeds, and the seedling performance of the sowing machine was tested through the quadratic rotation orthogonal combination experiment. By means of variance analysis, the influence of each factor on the re-seeding rate was obtained from big to small as suction pressure, clearing pressure and vibration frequency, the influence of each factor on the leak seeding rate was obtained from big to small as clearing pressure, suction pressure and vibration frequency, the influence of each factor on the qualified rate was obtained from big to small as suction pressure, clearing pressure and vibration frequency. The mathematical model between three factors and the indexes was built. The law between three factors and the indexes was analyzed and optimized parameters were tested. Parameters optimization and verification tests were performed. The optimal combination of parameters were as following: suction pressure was 15.7 kPa, clearing pressure was 3.3 kPa, vibration frequency was 50 Hz, and the re-seeding rate was 1.26%, the leak seeding rate was 1.75%, and the qualified rate was 96.99%. Under the same experimental conditions, the test results showed that the re-seeding rate was 1.4%, the leak seeding rate was 1.7%, and the qualified rate was 96.9%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Vibration analysis

Controlled terms: Regression analysis? - ?Vegetables

Uncontrolled terms: Experimental conditions? - ?Parameter optimization? - ?Parameters optimization? - ?Seedling performance? - ?Simulation analysis? - ?Structural parameter? - ?Vegetable seedlings? - ?Vibration frequency

Classification code: 821.4 Agricultural Products? - ?922.2 Mathematical Statistics

Numerical data indexing: Frequency 5.00e+01Hz, Percentage 1.26e+00%, Percentage 1.40e+00%, Percentage 1.70e+00%, Percentage 1.75e+00%, Percentage 9.69e+01%, Percentage 9.70e+01%, Pressure 1.57e+04Pa, Pressure 3.30e+03Pa

DOI: 10.6041/j.issn.1000-1298.2018.S0.012

Compendex references: YES

Database: Compendex

38. Fatigue Life Analysis of Grain Combine Harvester Cleaning Device

Accession number: 20191406729533

Authors: Wang, Legang (1, 2); Zhang, Xiaohui (1); Leng, Jun (1); Zhao, Guangjun (1); Jiao, Zhongyuan (1); Qin, Yongfeng (1)

Author affiliation: (1) Lovol Heavy Industry Co., Ltd., Weifang; 261206, China; (2) Shandong Province Major Crop Mechanization Production Equipment Collaborative Innovation Center, Qingdao; 266109, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 282-287

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Guided by equal strength design ideas, the objective was to improve the fatigue life and prolong the use efficiency of the combine harvester cleaning device by using rigid-flexible coupling dynamics analysis, fatigue life analysis and assembly dimensional tolerance analysis. Through the establishment of the clearing sieve dynamics model, the key factors affecting the fatigue life of the main components of the cleaning device were obtained. The systematic improvement was carried out to improve the fatigue life of the combine harvester cleaning system. A fatigue life analysis method and optimization design method for the cleaning system were proposed. The accuracy of the analysis method was verified by experiments. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Fatigue of materials

Controlled terms: Cleaning? - ?Combines? - ?Fits and tolerances? - ?Flexible couplings? - ?Harvesters

Uncontrolled terms: Cleaning devices? - ?Combine harvesters? - ?Dimensional tolerance? - ?Fatigue life analysis? - ?Grain combines? - ?Optimization design? - ?Rigid-flexible coupling dynamics? - ?Rubber bearing

Classification code: 602.2 Mechanical Transmissions? - ?802.3 Chemical Operations? - ?821.1 Agricultural Machinery and Equipment? - ?951 Materials Science

DOI: 10.6041/j.issn.1000-1298.2018.S0.037

Compendex references: YES

Database: Compendex

39. Comparison on Hyperspectral Estimation Method of Nitrogen Content in Bamboo Leaf

Accession number: 20191406729447

Authors: Zheng, Yili (1); Zhao, Yandong (1); Dong, Wei (1, 2); Chen, Xingcan (1, 3); Li, Yixin (1, 3)

Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China; (2) Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Forestry University, Beijing; 100083, China; (3) Key Laboratory of State Forestry Administration for Forestry Equipment and Automation, Beijing; 100083, China

Corresponding author: Zhao, Yandong(yandongzh@bjfu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 393-400

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to achieve rapid and non-destructive detection of nitrogen content in bamboo leaves, Phyllostachys aureosulcata leaves were used as samples for the hyperspectral analysis. To a certain extent, the nitrogen content in plant leaves can reflect the nitrogen condition inside the plant, which has a good prediction effect on plant growth. The spectral data of bamboo leaf was obtained by using the field portable terrain spectrometer with spectral range from 350 nm to 2 500 nm. Correlational analysis was conducted between the nitrogen content measured by the chemical method and the hyperspectral reflectance, the first order differential reflectance, the logarithmic first order differential reflectance and the second order differential reflectance of bamboo leaves, respectively, and the characteristic bands were obtained. Four estimation models of nitrogen content of bamboo leaf were established by the binary linear regression, multivariate stepwise regression, partial least squares regression (PLRS) and principal component analysis-BP neural network regression (PCA-BP). respectively. The experimental results of four estimation models showed that by using the logarithmic first order difference of the hyperspectral reflectance, PCA-BP estimation model with 6-10-1 topology based on principal component analysis had better estimation result. The determination coefficient (R2) and root mean square error (RMSE) were 0.838 and 0.045 2, respectively. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Principal component analysis

Controlled terms: Bamboo? - ?Chemical analysis? - ?Least squares approximations? - ?Mean square error? - ?Neural networks? - ?Nitrogen? - ?Reflection? - ?Regression analysis? - ?Topology

Uncontrolled terms: Bamboo leaf? - ?Binary linear regression? - ?Hyper spectra? - ?Multiple stepwise regression? - ?Nitrogen content? - ?Partial least squares regression

Classification code: 804 Chemical Products Generally? - ?811.1 Pulp and Paper? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics

Numerical data indexing: Size 3.50e-16m2 to 2.50e-06m2

DOI: 10.6041/j.issn.1000-1298.2018.S0.053

Compendex references: YES

Database: Compendex

40. Collecting Method of Forest Area Monitoring Station Based on K-SVD Basis

Accession number: 20191406729545

Authors: Zhao, Yue (1, 2); Xie, Huiping (1, 3); Gao, Chao (1, 3); Zhao, Yandong (1, 3)

Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China; (2) Key Laboratory of State Forestry Administration for Forestry Equipment and Automation, Beijing; 100083, China; (3) Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Municipal Education Commission, Beijing; 100083, China

Corresponding author: Zhao, Yandong(yandongzh@bjfu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 365-371

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The application of compression sensing technology was put forward based on K-SVD dictionary learning algorithm in forest microenvironment monitoring station. It would greatly reduce the number of data transmission, thus reducing the use of monitoring stations and prolonging the service life of monitoring stations. The air temperature data was used as the experimental object, and it verified the feasibility of the algorithm, and compared with the previous proposed compression sensing technique based on the discrete Fourier transform base. The experimental results were as follows: when the sparsity was the same, the average sparsity error of the learning dictionary based on K-SVD algorithm training was always less than that of the DFT dictionary when the original signal was sparsely represented, and the error distribution range was concentrated and basically lower than the median line of the DFT dictionary. When sparsity and compression ratio were the same, the average reconstruction error of learning dictionary was always smaller than that of DFT dictionary, and the error distribution range was more concentrated. To sum up, in the forest micro-environment monitoring station, the dictionary trained by the K-SVD algorithm had better sparse representation performance and reconstruction performance, which can reduce the operation power of the monitoring station while reducing the error of data transmission. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Learning algorithms

Controlled terms: Compressed sensing? - ?Data transfer? - ?Discrete Fourier transforms? - ?Errors? - ?Forestry? - ?Monitoring

Uncontrolled terms: Compression sensing? - ?Dictionary learning? - ?Dictionary learning algorithms? - ?Error distributions? - ?Microenvironments? - ?Monitoring stations? - ?Reconstruction error? - ?Sparse representation

Classification code: 716.1 Information Theory and Signal Processing? - ?921.3 Mathematical Transformations

DOI: 10.6041/j.issn.1000-1298.2018.S0.049

Compendex references: YES

Database: Compendex

41. Design and Experiment of Smashed Straw Unit for High Stubble Maize Double Header

Accession number: 20191406729503

Authors: Zhang, Ji (1, 2); Yu, Yongtao (1); Yang, Qiyong (1); Zhang, Jiwang (3); Zhang, Zhilong (1); Geng, Aijun (1)

Author affiliation: (1) School of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China; (3) College of Agriculture, Shandong Agricultural University, Tai’an; 271018, China

Corresponding author: Geng, Aijun(gengaj@sdau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 42-49

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: At present, the main mode of maize straw returning is total returning, which has large amount of returning and stubble is not perishable after burying straw. The operation mode of corn straw grinder is near ground crushing, in the process of crushing, the blade is inevitably exposed to soil and worn quickly, which leads to the poor quality of straw pulverization. Therefore, a comprehensive utilization plan of corn straw was put forward. When the corn was harvested and picked, the straw above the ground must be recovered and the remaining must be cut off back to the field. On this basis, the double header was designed on the 4YZQ-2B1 type corn harvester for reaping both corn stalk and spike. The saw-disc pulverizer was added below header, circular saw blades were adopted by the device and arranged in inverted cone, the diameters of blades were gradually reduced from top to bottom. Linear speed of the tooth tip of saw blade tip was proportional to the diameter of circular saw blade, during the process of cutting corn straw, there was a relative velocity between the adjacent saw blades. It had the effect of tearing while cutting straws, which was more beneficial to the pulverization of straw and the subsequent decay. In addition, maize straw was crushed by the circular saw blade while upright, and the saw blade was not exposed to soil to reduce wear. The saw tooth of the saw blade can keep sharp for a long time to ensure the effect of straw sawing and crushing. Combined with the movement and cutting mechanism of circular saw blades, the influence of saw blade thickness on sawing, and the height and amount of saw blade teeth on cutting and re-cutting were analyzed emphatically. At the same time, the parameter optimization and motion analysis of double header was carried out by ADAMS. The operating parameters of the two rows of picker rollers were analyzed to ensure the consistency of the harvesting monomers in two rows. The trajectory of effective working height of circular saw blades with diameter of 180 mm was analyzed. The result showed that there was a coincidence between the track lines. The saw-disc pulverizer would not produce leakage during operation. Through the Pro/Mechanica in Pro/E, the first order vibration mode of saw blade shaft was simulated, and the natural frequency of saw blade shaft was analyzed. In order to eliminate vibration, trying to let the external excitation and avoid natural frequency or minimize the excitation of natural frequency. The plane saw body integral circular saw blade was adopted by the saw-disc pulverizer, the diameter was 180~380 mm, and the thickness was divided into 1.2 mm, 1.5 mm and 2 mm. The tooth shape was isosceles triangular profile bevel gear tooth with height of 7.5 mm. And the center distance of the two knife roller was 760 mm. Field experiments on qualified rate of chopping length, returning amount and stubble height of high-stubble maize double-header were carried out. The results showed that the qualified rate of straw chopping length was 92.14%, average stubble height was 52.18 mm when working speed was 2 m/s, rotation rate of the knife roller was 850 r/min, all test indicators were satisfied with standards of straw stubble machine, and the amount of returning to field was 30% to 40% of the full amount, it can achieve the corn stalks smashing from the ground and completely chopping of straw fiber and improve the quality of corn stalks returned to soil. The quality of corn straw returning to field was improved, and the problems of blade wear and poor quality of straw chopping were overcome. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Sawing

Controlled terms: Crushing? - ?Grinding mills? - ?Harvesters? - ?Metal working saws? - ?Natural frequencies? - ?Rollers (machine components)? - ?Soils? - ?Vibration analysis? - ?Wear of materials

Uncontrolled terms: Comprehensive utilizations? - ?Corn harvesters? - ?Cornstalk macerator? - ?Cutting mechanisms? - ?External excitation? - ?Isosceles triangular? - ?Operating parameters? - ?Parameter optimization

Classification code: 483.1 Soils and Soil Mechanics? - ?601.2 Machine Components? - ?821.1 Agricultural Machinery and Equipment? - ?951 Materials Science

Numerical data indexing: Percentage 3.00e+01% to 4.00e+01%, Percentage 9.21e+01%, Rotational_Speed 8.50e+02RPM, Size 1.20e-03m, Size 1.50e-03m, Size 1.80e-01m, Size 1.80e-01m to 3.80e-01m, Size 2.00e-03m, Size 5.22e-02m, Size 7.50e-03m, Size 7.60e-01m, Velocity 2.00e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.007

Compendex references: YES

Database: Compendex

42. Establishment of Seeding Amount Control Model for Centralized Pneumatic Metering System for Rice

Accession number: 20191406729513

Authors: Qi, Bing (1); Zhang, Wenyi (1); Yu, Shanshan (1); Ji, Yao (1); Li, Kun (1); Zhang, Shuyan (1)

Author affiliation: (1) Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Nanjing; 210014, China

Corresponding author: Zhang, Wenyi(zwy-yxkj@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 125-131

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Rice is one of the most important food crops in China. Rice direct seeding is becoming more and more popular in China for its low-input demand. A centralized pneumatic metering system for rice direct seeding was involved, which distributed seeds to 33 rows through only one metering system. There were two main ways to adjust the seeding amount of a rice seeder. One was the effective length adjustment of seed meter and the other one was the adjustment of speed ratio of metering wheel and machine. Either way treated seeding rate of each turn (SRE) as a fixed value, and the accuracy of seeding rate adjustment was poor. Seed height (h), speed of the seed metering wheel (n) and seed moisture content were the key factors for SRE of the metering system. In order to improve the accuracy of seeding rater of the centralized pneumatic metering system, experiments were carried out through a metering device test-bed JPS-12, seed height (h) and speed of the seed metering wheel (n) under four different moisture contents of seeds were selected as the experimental factor while SRE was selected as the test index. The effect of seed height (h), speed of seed metering wheel (n) and seed moisture content on SRE was revealed by the analysis of the test data. The experiment showed that SRE of different seed moisture content was decreased with the increase of rotation speed of the metering wheel. When the height of the seed height was fixed, the two was inverse ratio. SRE was increased at first and then decreased with the increase of seed height, and the maximum of SRE appeared when the seed height was between 25.35 cm and 31.55 cm. Under the four different seed moisture contents, SRE from large to small were dry seed, seed that dried two days, seed that dried one day and wet seed, and SRE was decreased with the increase of seed moisture content. With two-regression analysis, the regression model of SRE with seed height and speed of the seed metering wheel under four different seed moisture contents was acquired, and a seeding amount control model based on the control of speed of the seed metering wheel was constructed. The test platform was built to test the seeding amount control model. The average error of the control model was 2.07%, and the actual sowing quantity variation coefficient was 2.59%. The verification results were basically consistent with the control model. The control model of rice seeding amount under the influence of multiple factors was established. The influence of seed height, speed of the seed metering wheel and seed moisture content on SRE was clarified, which could be used for the design and optimization of rice seeding amount control system. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Moisture

Controlled terms: Moisture determination? - ?Pneumatics? - ?Regression analysis? - ?Speed? - ?Testing? - ?Wheels

Uncontrolled terms: Design and optimization? - ?Different moisture contents? - ?Rice? - ?Seed metering devices? - ?Seed moisture contents? - ?Seeder? - ?Variation coefficient? - ?Verification results

Classification code: 601.2 Machine Components? - ?632.3 Pneumatics? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements

Numerical data indexing: Percentage 2.07e+00%, Percentage 2.59e+00%, Size 2.54e-01m to 3.16e-01m

DOI: 10.6041/j.issn.1000-1298.2018.S0.017

Compendex references: YES

Database: Compendex

43. Simulation and Experiment of Reciprocating Cutter Kinematic of Portable Tea Picking Machine

Accession number: 20191406729525

Authors: Du, Zhe (1); Hu, Yongguang (1); Wang, Sheng (1)

Author affiliation: (1) School of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang; 212013, China

Corresponding author: Hu, Yongguang(deerhu@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 221-226

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Tea picking is one of the important links to tea production process, and the cutter is an important part of picking device. In order to reliably measure the primary cutting rate, repeated cutting rate and leakage rate of reciprocating cutter of portable tea picking machine, the reciprocating cutter was taken as an object of simulation and experiment. The kinematics simulation of cutter was studied by using ADAMS, and an experimental analysis of the primary cutting rate, repeated cutting rate and leakage rate was made by using response surface methodology based on simulation data. The results showed that the optimal combination of tooth pitch, tooth depth and cutting speed index were 20 mm, 18.61 mm and 1.05, respectively. For ease of processing, tooth pitch, tooth depth and cutting speed index were chosen to be 20 mm, 19 mm and 1.05, respectively. At this time, the values of primary cutting rate, repeated cutting rate and leakage rate were 76.45%, 21.34% and 2.50%, respectively. The results of the experimental research on the developed double-acting blade reciprocating cutter were compared with simulation data. The results showed that the range of leakage rate and primary cutting rate were 0.79%~3.64% and 70.55%~79.90% when the tooth pitch, tooth depth and cutting speed index were 20 mm, 19 mm and 1.05, respectively. While the error of leakage rate and primary cutting rate between the simulation and experimental data were 2% and 6%, respectively. The method provided a theoretical basis for optimizing the parameters of portable tea picking machine. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Cutting

Controlled terms: Experiments? - ?Kinematics

Uncontrolled terms: Cutter? - ?Experimental analysis? - ?Experimental research? - ?Kinematic simulations? - ?Kinematics simulation? - ?Optimal combination? - ?Picking machines? - ?Response surface methodology

Classification code: 901.3 Engineering Research? - ?931.1 Mechanics

Numerical data indexing: Percentage 2.00e+00%, Percentage 2.13e+01%, Percentage 2.50e+00%, Percentage 6.00e+00%, Percentage 7.65e+01%, Size 1.86e-02m, Size 1.90e-02m, Size 2.00e-02m

DOI: 10.6041/j.issn.1000-1298.2018.S0.029

Compendex references: YES

Database: Compendex

44. Design and Experiment of Spoon-clamping Type Metering Device for Faba Beans

Accession number: 20191406729511

Authors: Li, Yuhuan (1); Yang, Li (1); Han, Ying (2); Zhang, Dongxing (1); Cui, Tao (1); Yu, Yiming (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Yang, Li(yangli@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 108-116

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the problem of sowing faba beans and improve its mechanized level, a new type seed metering device was designed and evaluated. To analyze the pros and cons of the existed productions, an overall structure of the new spoon-clamping type seed metering device was built. Combined with physical characteristics of faba beans, the metering plate area, cambered slipway parameters and spoon-clip parameters were researched. For this metering device, there were different working areas and angles on metering plate, among which the seed-filling area was 105°, seed-clearing area was 130°, seed-protecting was 90°, seed-dropping area was 35°. And according to the theory of spoon-clamping type seed metering device, the range of length, width and bending angle of the new spoon can be optimized by measuring three-axis dimension. Bench experiments were conducted for the newly-designed spoon-clipping type seed-metering device. For confirming the optimal parameters of the new spoon-clamping type seed metering device, the orthogonal test was adopted with three levels and three factors. Three test parameters, i.e. length of spoon-clamp, width of spoon-clamp and bending angle were chosen as the influence factors of test experiment. The best working parameters were as below: the length of spoon-clamp was 15.5 mm, the width of spoon-clamp was 10 mm and the bending angle was 35°. The corresponding performance indexes were as following: the qualified index of seed spacing was 95.11%,the multiple index was 3.28%, and the missing-seeding index was 1.61%, which could completely meet the requirement of the technical specifications of quality evaluation for faba beans metering device in China. The research provided a reference for further improving quality and optimizing the parameter for spoon-clamping type metering device. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Quality control

Controlled terms: Plates (structural components)? - ?Pneumatic materials handling equipment

Uncontrolled terms: Faba beans? - ?Metering devices? - ?Performance indices? - ?Physical characteristics? - ?Precision seeding? - ?Seed metering devices? - ?Spoon-clamping type? - ?Technical specifications

Classification code: 408.2 Structural Members and Shapes? - ?632.4 Pneumatic Equipment and Machinery? - ?913.3 Quality Assurance and Control

Numerical data indexing: Percentage 1.61e+00%, Percentage 3.28e+00%, Percentage 9.51e+01%, Size 1.00e-02m, Size 1.55e-02m

DOI: 10.6041/j.issn.1000-1298.2018.S0.015

Compendex references: YES

Database: Compendex

45. Design and Experiment on Washer for Whole-leaf Vegetables

Accession number: 20191406729451

Authors: Ma, Xuefei (1); Du, Zhilong (1); Ma, Jiwei (1); Li, Jiawei (1); Zhao, Dan (1); Cao, Guangchu (1)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Du, Zhilong(13810043018@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 419-425

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: According to the requirements of leaf integrity, low damage and order in the cleaning process of whole-leaf vegetables, a washer was designed by integrating the cleaning power of air-bubble and water-jets. The cleaning process was determined, and the whole structure of the washer was designed. In view of difficulties in cleaning, such as leaves adhesion and floating in water, the basket was designed to vibrate and up-and-down motion periodically in order to simulate the manual cleaning process. The key components were designed, such as the rinse tank and filter, bubble generator and water jet, and the automatic operation of the equipment was realized. The computational fluid dynamics simulation was carried out for the air jet pipeline, and the distribution of gas phase at different air flow rates was studied, and the air flow rate range was determined as 2~ 8 m/s, and the selection of air pump was guided. The simulation of different pipelines with different diameters of air-jet hole and different hole spacings was done at air flow rate of 6 m/s. The gas phase distribution uniformity was used as the evaluation index, and the optimal pipeline parameters were got as air-jet hole diameter was 8 mm and hole spacing was 50 mm. Taking the whole spinach as the cleaning material, the washing weight, cleaning time and intensity of airflow were selected as factors which had three levels respectively, and a blank column was set at the same time for the four-factor and three-level orthogonal experiment. The damage rate and cleaning rate were used as evaluation indexes in cleaning test, and the comprehensive evaluation index was calculated according to the weight of damage rate and cleaning rate which accounted for 0.5. Orthogonal experimental analysis and variance analysis were performed. The test results showed that washing weight, cleaning time and intensity of airflow have signifcant influences on cleaning rate and damage rate of spinach, and the optimum cleaning parameters of spinach were obtained as washing weight was 4 kg, cleaning time was 120 s, and the intensity of airflow was 5 m/s. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Air cleaners

Controlled terms: Air? - ?Computational fluid dynamics? - ?Domestic appliances? - ?Gas dynamics? - ?Gases? - ?Jets? - ?Pipelines? - ?Vegetables? - ?Washers? - ?Washing

Uncontrolled terms: Air bubbles? - ?Comprehensive evaluation index? - ?Computational fluid dynamics simulations? - ?Experimental analysis? - ?Gas-phase distribution? - ?Leaf vegetables? - ?Low damages? - ?Water jets

Classification code: 451.2 Air Pollution Control? - ?601.2 Machine Components? - ?619.1 Pipe, Piping and Pipelines? - ?631.1 Fluid Flow, General? - ?631.1.2 Gas Dynamics? - ?723.5 Computer Applications? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products

Numerical data indexing: Mass 4.00e+00kg, Size 5.00e-02m, Size 8.00e-03m, Time 1.20e+02s, Velocity 2.00e+00m/s to 8.00e+00m/s, Velocity 5.00e+00m/s, Velocity 6.00e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.057

Compendex references: YES

Database: Compendex

46. Simulation and Experiment of Uniformity of Venturi Feeding Tube Based on DEM-CFD Coupling

Accession number: 20191406729509

Authors: Gao, Xiaojun (1); Xu, Yang (1); Yang, Li (1, 2); Zhang, Dongxing (1, 2); Li, Yuhuan (1); Cui, Tao (1, 2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Soil-Machine-Plant System Technology, Ministry of Agriculture, Beijing; 100083, China

Corresponding author: Cui, Tao(cuitao850919@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 92-100

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to study the mechanism affecting the uniformity of seed supply in Venturi, DEM-CFD coupling simulation method was used to analyze the variation of fluid field, coupling field and particle field under different shrinkage angles, and the shrinkage angle of 70° was obtained, the pressure field of the flow field was changed obviously, the range of action was reasonable, the maize accumulation phenomenon did not appear in the coupled field, and the continuous uniform velocity of the seed field was consistent. In order to explore the effect of seed feeding volume and air blowing pressure on the uniformity of Venturi feeding tube, orthogonal experiment was carried out to measure the uniformity of seed supply for the variation coefficient of seed quantity. The range analysis of the test results showed that the primary and secondary factors affecting the uniformity were the quantity of feeding and the air blowing pressure. The variance analysis showed that the quantity of feeding was a very significant factor, and the air blowing pressure was a significant factor, and the interaction terms of the two were not significant factors. The test results were optimized to obtain the best uniformity when the quantity of feeding was 1.8 kg/min and the air blow pressure was 7 kPa. The seeding performance test was carried out on the above combination when the seed meter rotation speed was 136 r/min. The qualified index was 92.18%, the leakage index was 0, and the multiple index was 7.82%. The results showed that no leakage can explain the combination was the best. Under this circumstance, the performance of Venturi feeding tube was uniform, which was basically consistent with the theoretical optimization results. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Feeding

Controlled terms: Computational fluid dynamics? - ?Experiments? - ?Factor analysis? - ?Shrinkage

Uncontrolled terms: Coupling simulation? - ?Gas-solid couplings? - ?Orthogonal experiment? - ?Seeding performance? - ?Simulation? - ?Uniformity? - ?Variation coefficient? - ?Venturi

Classification code: 691.2 Materials Handling Methods? - ?723.5 Computer Applications? - ?901.3 Engineering Research? - ?922.2 Mathematical Statistics? - ?951 Materials Science

Numerical data indexing: Mass_Flow_Rate 3.00e-02kg/s, Percentage 7.82e+00%, Percentage 9.22e+01%, Pressure 7.00e+03Pa, Rotational_Speed 1.36e+02RPM

DOI: 10.6041/j.issn.1000-1298.2018.S0.013

Compendex references: YES

Database: Compendex

47. Design of Intelligent Irrigation Decision System for Blueberry Garden in Hilly Area

Accession number: 20191406729445

Authors: Shen, Jianwei (1); Li, Lin (1); Wei, Xinhua (1)

Author affiliation: (1) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China

Corresponding author: Wei, Xinhua(wxh@ujs.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 379-386

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming at the problem of serious waste of water resources and serious shortage of labor in the irrigation process of blueberry gardens in hilly areas, a set of intelligent irrigation decision-making system was designed based on Internet of things technology. The system included an information acquisition module, a wireless communication module, an intelligent decision module and an irrigation execution module. The information collection module collected the soil moisture information and environmental information (wind speed, rainfall, temperature, humidity) of the blueberry garden through the soil moisture sensor and small weather station. The wireless transmission module sent the data collected by the information collection module to the server in real time. Analytical processing was carried out, and the calculation result of the intelligent decision-making module was transmitted to the irrigation execution module. In the intelligent decision-making module, based on the historical data collected in the previous stage, the Penman formula and the soil water balance formula were used to establish the irrigation decision model to realize transpiration amount and irrigation amount calculation and real-time monitoring and alarm. The model can determine whether irrigation and optimal irrigation amount were needed according to the data obtained in real time; the irrigation execution module calculated the irrigation time according to the received irrigation information and actual irrigation speed, and performed remote irrigation. Using Visual Studio software as the platform, the monitoring interface of the system host computer was designed to realize real-time detection and storage of soil and environmental parameters, analysis and management of crop water demand status, and real-time warning and irrigation decision. The test results showed that the intelligent irrigation decision-making system can independently judge the crop water demand based on the information collected by the sensor without intervention. When the system found that the crop needed irrigation, it would drive the irrigation device to complete the irrigation, thus realizing remote precision irrigation of blueberry garden. The remote precision irrigation saved manpower and material resources and effectively improved the utilization of irrigation water. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Irrigation

Controlled terms: Crops? - ?Decision making? - ?Digital storage? - ?Moisture control? - ?Remote control? - ?Soil moisture? - ?Water resources? - ?Wind

Uncontrolled terms: Blueberry garden? - ?Decision modeling? - ?Environmental information? - ?Intelligent decision making? - ?Intelligent irrigations? - ?Internet of things technologies? - ?Water requirements? - ?Wireless transmi-ssion modules

Classification code: 443.1 Atmospheric Properties? - ?444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?722.1 Data Storage, Equipment and Techniques? - ?731.1 Control Systems? - ?731.3 Specific Variables Control? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?912.2 Management

DOI: 10.6041/j.issn.1000-1298.2018.S0.051

Compendex references: YES

Database: Compendex

48. Analysis on Drying Characteristics of Apple Slices under Different Microwave Conditions

Accession number: 20191406729453

Authors: Lü, Hao (1); Lü, Weiqiao (1); Cui, Zhengwei (2); Lü, Huangzhen (3); Ma, Jiwei (3); Zhao, Dan (3)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Jiangsu Province Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi; 214122, China; (3) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Cui, Zhengwei(cuizhengwei@jiangnan.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 433-439

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to improve the drying efficiency and drying quality of fresh apple slices, a low-field nuclear magnetic resonance and imaging analyzer (NMR/MRI) were used to measure the water-migration and thermal-image characteristics of apple slices during microwave hot-airflow drying, microwave vacuum drying and hot-airflow drying respectively. Additionally, the color, texture and microporous structure of the dehydrated apple slices were analyzed. As a result, with the drying process, the signal A2i of the main peak was shifted to the left, and the main state of moisture was gradually changed into immobilized water and bound water. The total signal A2 in the front half of the hot-airflow drying process was decreased rapidly, which indicated that drying was much more difficult in the last stage. The uniformity of temperature in microwave hot-airflow drying was better than that in microwave vacuum drying, which indicated that hot air and fluidized bed had positive effect on improving the uniformity of microwave drying. In the aspect of drying quality, negative pressure environment can avoid the serious oxidative browning of apple slices, but the stability of color difference ΔE needed to be improved during microwave drying. The apple slices had puffing effect during microwave vacuum drying, and the products had the least compressive stress and obvious micro-pore structure. Therefore, microwave vacuum drying was most suitable for developing crisp dehydrated apple slices as leisure food. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Drying

Controlled terms: Colorimetry? - ?Fluidized beds? - ?Fruits? - ?Image enhancement? - ?Infrared drying? - ?Microwave heating? - ?Microwaves? - ?Nuclear magnetic resonance? - ?Pore structure? - ?Textures ? - ?Thermography (imaging)

Uncontrolled terms: Apple slices? - ?Drying characteristics? - ?Low field nuclear magnetic resonance? - ?Micro-pore structures? - ?Micro-porous structure? - ?Microwave - vacuum drying? - ?Microwave conditions? - ?Microwave drying

Classification code: 711 Electromagnetic Waves? - ?711.1 Electromagnetic Waves in Different Media? - ?742.1 Photography? - ?821.4 Agricultural Products? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?941.4 Optical Variables Measurements

DOI: 10.6041/j.issn.1000-1298.2018.S0.059

Compendex references: YES

Database: Compendex

49. Application of Biomass Co-combustion in Rural Daily Energy Supply

Accession number: 20191406729449

Authors: Zhou, Yuguang (1, 2); Zhao, Nan (1, 2); Li, Bowen (1, 2); Bahargul, Tohniyaz (1, 2); Chen, Deying (1, 2); Dong, Renjie (1, 2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Clean Production and Utilization of Renewable Energy, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing; 100083, China

Corresponding author: Dong, Renjie(rjdong@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 407-412

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: China has abundant biomass equal to over four million tons of standard coal, which can directly substitute coal in residential energy system. The focus was to quantify performances of household biomass co-combustion by comparing energy efficiency, emission characteristics and economic value of biomass, coal and co-fuel in a typical coal-burning stove under space-heating and cooking phase to promote clean and cheap biomass energy in rural areas. The results indicated that energy efficiency of co-fuel was much higher than that of biomass in coal-fire stove with a value of 68.10% in heating phase and 54.50% in cooking phase. The gaseous pollutant of SO2, NO and NO2 emitted from co-combustion were reduced significantly compared with coal burning, and PM2.5 was decreased to a low concentration which was much lower than the limiting value (100 mg/MJ) of Chinese standard. The emission reduction of SO2, NO, NO2 and PM2.5 was 22%, 67%, 88% and 18%, respectively, in heating phase, while the reduction emission was 11%, 64%, 63% and 33%, respectively, in cooking phase. The organic emissions of US-EPA priority PAHs with high carcinogenicity were also controlled well and the emission reduction of high-ring PAHs could reach 34% and 87% in heating and cooking phases. Compared with biomass in coal-fire stove, the emission of CO from co-fuel combustion was low with the reduction of 46% in heating phase and 61% in cooking phase. Moreover, the emission levels under heating phase were more stable than cooking phase due to relatively less artificial operations. The co-fuel was cheap, whose price on a unit energy basis was 0.039 yuan/MJ and the price on a unit mass basis was only half of coal. The burner of co-fuel was popular coal-burning stove, avoiding purchasing expensive biomass stove and ensuring the expenditure for daily energy uses within the economic bearing capacity of low-income families. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 27

Main heading: Coal combustion

Controlled terms: Agricultural wastes? - ?Biomass? - ?Coal? - ?Economic analysis? - ?Emission control? - ?Energy efficiency? - ?Fog? - ?Fuels? - ?Heating? - ?Nitrogen oxides ? - ?Polycyclic aromatic hydrocarbons? - ?Reduction? - ?Rural areas? - ?Stoves? - ?Waste incineration

Uncontrolled terms: Biomass co-combustion? - ?Economic performance? - ?Emission characteristics? - ?Gaseous pollutants? - ?Low concentrations? - ?Particulate Matter? - ?Residential energy systems? - ?Rural energy

Classification code: 443.1 Atmospheric Properties? - ?451.2 Air Pollution Control? - ?452.4 Industrial Wastes Treatment and Disposal? - ?524 Solid Fuels? - ?525.2 Energy Conservation? - ?802.2 Chemical Reactions? - ?804.1 Organic Compounds? - ?804.2 Inorganic Compounds? - ?821.5 Agricultural Wastes? - ?911.2 Industrial Economics

Numerical data indexing: Percentage 1.10e+01%, Percentage 1.80e+01%, Percentage 2.20e+01%, Percentage 3.30e+01%, Percentage 3.40e+01%, Percentage 4.60e+01%, Percentage 5.45e+01%, Percentage 6.10e+01%, Percentage 6.30e+01%, Percentage 6.40e+01%, Percentage 6.70e+01%, Percentage 6.81e+01%, Percentage 8.70e+01%, Percentage 8.80e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.055

Compendex references: YES

Database: Compendex

50. Design and Experiment of Hydraulic Multi-point Power Output System for Hilly and Mountain Tractors

Accession number: 20191406729459

Authors: Fan, Yongkui (1, 2); Mao, Enrong (1, 2); Zhu, Zhongxiang (1, 2); Xie, Bin (1, 2); Liu, Tengyi (1, 2); Shang, Nana (1, 2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, Beijing; 100083, China

Corresponding author: Zhu, Zhongxiang(zhuzhongxiang@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 477-485

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Due to the complexity of terrain of hilly mountains, in which areas are usually undulating, the body of hilly mountain tractors is needed to be balanced during work. Meanwhile, the suspension devices are needed to be adjusted in real time to adapt to the terrain changes. However, the open hydraulic system of quantitative pump was generally used currently by domestic ordinary small and medium horsepower tractor hydraulic suspension device, while the hydraulic system had a single output function and could not be operated simultaneously with the hydraulic suspension system, so that the compound operational demand of hilly mountain tractor hydraulic suspension system could not be satisfied. To solve this problem, hydraulic multi-point power output system, which was suitable for compound operation of hilly mountain tractors, was designed. Firstly, the mathematical model of the main hydraulic valve was established according to the working principle of the valve. Then, the overall design plan was done based on the simulation software, called advanced modeling environment of simulation (AMESim), the system simulation model of tractor hydraulic multi-point power output was built. The results of simulation were as follows: when the load on the right side was changed stepwise, the adjustment time of system pressure was 0.1 s, the overshoot was 2.13%, the two steady-state flows remained unchanged; when the right spool was changed stepwise, the right flow rate was changed from 7.2 L/min to 13 L/min, the adjustment time was 0.1 s, the overshoot was zero, and the left flow fluctuation was very small. Finally, an indoor test was carried out, and the results showed that the designed hydraulic system had the function of load sensitivity, pressure compensation and flow distribution. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Suspensions (components)

Controlled terms: Computer software? - ?Hydraulic equipment? - ?Landforms? - ?Thermoelectric power? - ?Tractors (agricultural)? - ?Tractors (truck)

Uncontrolled terms: Flow distribution? - ?Load sensitivities? - ?Power out put? - ?Pressure compensation? - ?Simulation on AMESim

Classification code: 481.1 Geology? - ?601.2 Machine Components? - ?632.2 Hydraulic Equipment and Machinery? - ?663.1 Heavy Duty Motor Vehicles? - ?723 Computer Software, Data Handling and Applications

Numerical data indexing: Percentage 2.13e+00%, Time 1.00e-01s

DOI: 10.6041/j.issn.1000-1298.2018.S0.065

Compendex references: YES

Database: Compendex

51. Experiment on Collector Performance of Parabolic Trough Solar Collecting System

Accession number: 20191406729538

Authors: Qian, Wang (1); Wang, Zhenhua (1); Ma, Sai (1); Liu, Guilin (1); He, Gang (1); Luo, Jinhai (1)

Author affiliation: (1) Hohhot Branch of Chinese Academy of Agricultural Mechanization Sciences Co., Ltd., Huhhot; 010010, China

Corresponding author: Ma, Sai(752015788@qq.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 320-326 and 331

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Because of its high photo-thermal conversion efficiency, the parabolic trough solar collecting system in solar thermal power generation is more mature. Therefore,in recent years more and more applications were made in the field of forage drying. In order to further improve the efficiency of forage drying, as steady output of dry hot wind energy,the parabolic trough solar collecting system, the heat collecting performance and heat loss of vacuum heat collecting pipes were studied. Through studying,the factors that improved the heat gathering efficiency of the system was found out. Tracking the inlet, outlet and inner temperatures of a vacuum heat collector by heating the heat transfer oil storage energy using a slot solar heat collector system. The effect of instantaneous temperature of heat transfer oil was discussed from different angles, especially when entering vacuum heat collector on the transient heat conversion efficiency of heat collector. It can be deduced from the opposite side that the instantaneous heat conversion efficiency of the collector was related to the temperature of the heat guide medium when entering the collector. The lower the temperature of the heat transfer oil of the collector was, the more full the heat exchange was, and the less the heat loss of the vacuum heat collector can be got, the higher the instantaneous heat conversion efficiency of the collector can be obtained. So how to increase the heat transfer oil temperature difference between the outlet and inlet of the collector was the key to improve the heat storage capacity. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Collector efficiency

Controlled terms: Conversion efficiency? - ?Drying? - ?Experiments? - ?Heat losses? - ?Heat storage? - ?Solar heating? - ?Wind power

Uncontrolled terms: Collecting pipes? - ?Collecting systems? - ?Gathering performance? - ?Heat conversion efficiencies? - ?Heat storage capacity? - ?Parabolic trough? - ?Photo-thermal conversions? - ?Solar thermal power generation

Classification code: 525.5 Energy Conversion Issues? - ?615.8 Wind Power (Before 1993, use code 611 )? - ?641.2 Heat Transfer? - ?657.1 Solar Energy and Phenomena? - ?702.3 Solar Cells? - ?901.3 Engineering Research

DOI: 10.6041/j.issn.1000-1298.2018.S0.042

Compendex references: YES

Database: Compendex

52. Optimization Design of Electric Tractor Chassis Based on Multiple Performance Objectives

Accession number: 20191406729461

Authors: Zhao, Sixia (1); Liu, Mengnan (1); Xu, Liyou (1)

Author affiliation: (1) Vehicle and Transportation Engineering Institute, Henan University of Science and Technology, Luoyang; 471003, China

Corresponding author: Xu, Liyou(xlyou@haust.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 492-498

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In view of the relatively few researches on the chassis layout of electric tractor, the chassis layout design was carried out based on the matching results of the whole machine. The model was established by using 3D modeling software, and the center of gravity parameters of main parts of whole machine was extracted. Then, by analyzing the mechanical characteristics of tractor traction unit, a mathematical model was established. Taking the traction efficiency of the electric tractor and weight of the whole machine as the optimization objective, the NSGA- algorithm was used for multi-objective optimization. The influence factors of tractor’s stability, driving force, load fluctuation and life of drive system and walking system parts were considered as the constraint conditions of the algorithm. The constraint equations were set up. The gravity function of the electric tractor, centroid of front and rear battery packs and centroid of the whole machine were taken as the target variables, and the objective function of optimal power and economy was derived. Through the ModeFRONTIER platform, the NSGA- algorithm was used to optimize the battery distribution. The results of the optimization under two different tillage depth conditions were compared and analyzed. It was found that when the tillage depth was 180 mm, the overall weight of the optimized electric tractor was reduced by 14.3% compared with the weight of experience method, and the counterweight was only 25.3 kg. When the tillage depth was 240 mm, the overall weight of the electric tractor was reduced by 10.3% compared with the weight of experience method, and the counterweight was only 4.4 kg. The results showed that the empirical method based on traditional tractor was not suitable for electric tractors. Under the working conditions, the driving wheel slip ratio of the optimized electric tractor was less than the characteristic slip ratio, and the traction efficiency of the whole machine was obviously improved. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Electric traction

Controlled terms: 3D modeling? - ?Agriculture? - ?Battery Pack? - ?Chassis? - ?Efficiency? - ?Multiobjective optimization? - ?Tractors (agricultural)? - ?Tractors (truck)

Uncontrolled terms: Chassis design? - ?Constraint conditions? - ?Constraint equation? - ?Electric tractors? - ?Mechanical characteristics? - ?Performance objective? - ?Traction efficiency? - ?Traction performance

Classification code: 663.1 Heavy Duty Motor Vehicles? - ?663.2 Heavy Duty Motor Vehicle Components? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?913.1 Production Engineering? - ?921.5 Optimization Techniques

Numerical data indexing: Mass 2.53e+01kg, Mass 4.40e+00kg, Percentage 1.03e+01%, Percentage 1.43e+01%, Size 1.80e-01m, Size 2.40e-01m

DOI: 10.6041/j.issn.1000-1298.2018.S0.067

Compendex references: YES

Database: Compendex

53. Design and Experiment of High Temperature and Rapid Fermentation Equipment for Livestock and Poultry Excrement

Accession number: 20191406729450

Authors: Yuan, Xingmao (1); Fan, Guochang (1); Chen, Lin (1); Gao, Qinghai (1); Zhang, Xiuping (1); Zhang, Yazhen (1)

Author affiliation: (1) Institute of Agricultural Mechanization Research, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang; 050051, China

Corresponding author: Fan, Guochang(fgch0119@sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 413-418

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to overcome the shortcomings of traditional manure fermentation modes, such as equipment simple, low efficiency, high energy consumption, untotal fermentation and secondary pollution, a new kind of equipment with high temperature and rapid fermentation for livestock and poultry excrement was developed. The operational principle and process flow of the equipment were introduced. The overall unit and the key parts such as major structure and mixing system were designed, calculated and analyzed by using finite element method. According to the requirement of fermentation process, using cow dung with water content of 55% as raw material, the temperature distribution and uniformity of the material in the tank was tested and analyzed, and the fermentation product was also tested. Experiment and test results showed that the whole fermentation process from incoming to outgoing materials lasted nine days, and the equipment consumed 1 021 kW?h, in the fourth day after the cow dung was put into the tank, the average temperature of materiel in the tank was 64.81, and the temperature uniformity coefficient of variation was 1%; the mass fraction, nutrient content and death rate of lumbricoid egg of produced organic fertilizer was 53.5%, 5.36% and 100%, respectively; the number of fecal coliforms fecal was less than two per gram. All of those indices met the requirement of national standard of organic fertilizer industry. The research result provided reference for the research and development of high temperature and fast fermentation equipment for animal manure. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Fermentation

Controlled terms: Agriculture? - ?Energy utilization? - ?Fertilizers? - ?Finite element method? - ?Manures? - ?Process control? - ?Tanks (containers)? - ?Water pollution

Uncontrolled terms: Coefficient of variation? - ?High energy consumption? - ?High temperature? - ?Livestock and poultry excrement? - ?Operational principles? - ?Organic fertilizers? - ?Research and development? - ?Temperature uniformity

Classification code: 453 Water Pollution? - ?525.3 Energy Utilization? - ?619.2 Tanks? - ?804 Chemical Products Generally? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.5 Agricultural Wastes? - ?921.6 Numerical Methods

Numerical data indexing: Percentage 1.00e+02%, Percentage 5.35e+01%, Percentage 5.36e+00%, Percentage 5.50e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.056

Compendex references: YES

Database: Compendex

54. Performance Analysis of Gravity Assist Filling Precision Seed-metering Device with Synchronously Rotating Seed Plate and Vacuum Chamber

Accession number: 20191406729512

Authors: Yan, Bingxin (1); Zhang, Dongxing (1); Yang, Li (1); Cui, Tao (1); Zhong, Xiangjun (1); Li, Yuhuan (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Yang, Li(yangli@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 117-124

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: To explore the influence of gravity assist on the filling performance of the vacuum precision seed-metering device with synchronously rotating seed plate and vacuum chamber, taking the vacuum precision seed-metering device as the carrier, stress analysis of filling process was carried out, and mathematical model of gravity-assisted filling was shown. The results showed that gravity radial component along the seed tray was consistent with direction of dragging force, during the filling process; gravity radial component along the seed tray was consistent with direction of pressure gradient force, during filled seeds detachment process from population. Effects of different numbers of seeds to be filled seed on average normal force of seed tray under low, medium and high states were analyzed by simulation using engineering discrete element method (EDEM) software. Simulation results showed that average normal force was not changed significantly within low, medium and high states under population of 300; the average normal force was varied within low, medium and high states under population of 600, 900 and 1 200, the influence of the population on the filling effect can be neglected. Laboratory tests results showed that missing index of seed-metering device from big to small was satisfied as low condition, medium condition and high condition. Comparison test between gravity-assisted filling and non-gravity-assisted filling of the seed-metering device showed that qualified index was above 94% under operating pressure of 3~5.5 kPa with gravity-assisted filling, which met national standard under operating pressure above 6 kPa with no gravity-assisted. Gravity-assisted filling significantly reduced operating pressure demand and improved the quality of work. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Filling

Controlled terms: Computer software? - ?Pneumatic materials handling equipment? - ?Stress analysis

Uncontrolled terms: Filling effects? - ?Gravity-assisted? - ?Maize? - ?Metering devices? - ?Synchronous seed plate and chamber

Classification code: 691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?723 Computer Software, Data Handling and Applications? - ?951 Materials Science

Numerical data indexing: Percentage 9.40e+01%, Pressure 3.00e+03Pa to 5.50e+03Pa, Pressure 6.00e+03Pa

DOI: 10.6041/j.issn.1000-1298.2018.S0.016

Compendex references: YES

Database: Compendex

55. Investigation on Hot-air Drying of Camellia oleifera Seeds

Accession number: 20191406729452

Authors: Wang, Fenghe (1); Ding, Yechun (2, 3); Chen, Pengxiao (1); Xie, Weijun (1); Li, Xiaoqiang (1); Yang, Deyong (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Pharmacy, Gannan Medical University, Ganzhou; 341000, China; (3) Collaborative Innovation Center for Gannan Oil-tea Camellia Industrial Development, Gannan Medical University, Ganzhou; 341000, China

Corresponding author: Yang, Deyong(ydy@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 426-432

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The drying characteristics of Camellia oleifera seeds and the internal moisture diffusion coefficient at different drying temperatures were studied. According to the pre-test results, the drying characteristics of Camellia oleifera seeds were investigated at different air temperatures and different initial moisture contents. The empirical relationships between the natural logarithmic lnMR and drying time, moisture effective diffusion coefficient Deff and drying air temperature was established. The applicability of nine mathematical models in hot air drying of Camellia oleifera seeds was compared. The results showed that there was no apparent constant-rate drying period in the hot-air drying process, and moisture removal mainly occurred in the falling-rate drying period. The initial moisture content and hot-air temperature were the main factors that affected the drying process. The lower the initial moisture content was, the higher the drying temperature was, the shorter the drying time to the target moisture content was. In the process of drying, the effective moisture diffusion coefficient was increased with the increase of temperature. When the hot-air temperature was increased from 50 to 80, the coefficient was increased from 1.313 2×10-9 m2/s to 3.922 3×10-9 m2/s and the activation energy was 33.619 3 kJ/mol. The results of comparing the values of the correlation coefficient R2, the root mean square error eRMSE and the chi-square χ2 showed that the Lewis model was the optimal model for describing the hot-air drying of Camellia oleifera seeds and the predicted drying characteristic curve fitted well with experimental results obtained. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 27

Main heading: Drying

Controlled terms: Activation energy? - ?Atmospheric temperature? - ?Diffusion? - ?Food technology? - ?Mean square error? - ?Moisture? - ?Moisture determination? - ?Solar dryers

Uncontrolled terms: Camellia oleifera seeds? - ?Drying air temperatures? - ?Drying characteristics? - ?Drying model? - ?Effective diffusion coefficients? - ?Hot air drying? - ?Initial Moisture Content? - ?Moisture diffusion coefficient

Classification code: 443.1 Atmospheric Properties? - ?657.1 Solar Energy and Phenomena? - ?822 Food Technology? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements

DOI: 10.6041/j.issn.1000-1298.2018.S0.058

Compendex references: YES

Database: Compendex

56. Virtual Test Method for Algorithm of Crop Row Detection

Accession number: 20191406729499

Authors: Zhai, Zhiqiang (1, 2); Zhu, Zhongxiang (1); Li, Zhen (1); Du, Yuefeng (1); Mao, Enrong (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Institute of Space Launch Technology, Beijing; 100076, China

Corresponding author: Zhu, Zhongxiang(zhuzhonxiang@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 14-22

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Crop row detection is an intrinsic issue for machine vision-based guidance of agricultural machinery. The classical development for algorithm of crop row detection is based on real field images. Real field image acquisition is related to crop growth cycle closely, which is greatly affected by local district, climate and crop growth status. If the appropriate period of real field image acquisition was missed, the development for algorithm of crop row detection would be delayed directly and the cost would also be increased. In order to improve the efficiency of development of crop row detection and save cost, a new method based on virtual reality to test the crop row detection was proposed. Crop rows were simulated in virtual test environment to provide image data for the development of crop row detection. The proposed method consisted of two parts which were simulation of crop row field and virtual image acquisition. The 3DS Max and Multigen-Creator were used to build models. The Vega Prime was used to simulate the models in virtual environment. To simulate the real crop row field, the individual characteristics and group characteristics were considered during the modeling, respectively. The simulation of a virtual crop row field was composed of the modeling of single crop and weed. A fusion method was proposed to build models of the single crop and weed. Specifically, the leaf of crop and weed whose spatial feature were anisotropy was modeled with the counterdraw method; the stem and petiole of crop and weed whose feature were concealed by leaves were modeled with the billboard method or cross method. To express the group characteristics of real crop row field, a parametric modeling method was proposed based on random sampling. The sample libraries of crop and weed were composed by several models, respectively. Every crop and weed was placed in the virtual environment at random position and rotate angle within specific thresholds. The spaces in row and column directions were set according to the real field. In order to acquire the virtual field image, an image acquisition system was designed in Vega Prime. The asymmetric projection was used to simulate the lens of a real camera. The number of render window was equal to the number of lens. The attitude of viewpoint simulated the relative attitude between camera and vehicle. The specification of viewfinder was adjusted to acquire images with different sizes. After the image of virtual field was acquired, the algorithm of crop row detection could be tested. Crop rows of cotton in seeding stage were simulated as an example. A binocular vision-based algorithm of crop row detection was tested with the acquired images of virtual cotton field. The experimental results of virtual field and real field were similar. Results showed that the proposed modeling method can build the virtual cotton field conveniently, which provided sufficient images for testing the algorithm of crop row detection. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Crops

Controlled terms: Binocular vision? - ?Cameras? - ?Cotton? - ?Image acquisition? - ?Stereo image processing? - ?Testing? - ?Virtual reality

Uncontrolled terms: Asymmetric projection? - ?Crop row detection? - ?Image acquisition systems? - ?Individual characteristics? - ?Three-dimensional model? - ?Virtual scenes? - ?Virtual tests? - ?Vision based algorithms

Classification code: 723 Computer Software, Data Handling and Applications? - ?723.2 Data Processing and Image Processing? - ?741.2 Vision? - ?742.2 Photographic Equipment? - ?821.4 Agricultural Products

DOI: 10.6041/j.issn.1000-1298.2018.S0.003

Compendex references: YES

Database: Compendex

57. Structure Optimization of Frame for Field Vegetable Power Machinery Based on Measured Load Data

Accession number: 20191406729457

Authors: Xie, Bin (1); Wen, Changkai (1); Yang, Zihan (1); Lu, Tiebiao (1); Song, Zhenghe (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 463-469

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: As a new type of machine, field vegetable power machinery can realize different pre-harvest mechanization operations. The frame is subjected to various loads during field operations, which is accompanied by dynamic load. It is necessary to carry out strength research and optimization design of the frame. The multi-objective topology optimization design method based on field measured strain data was studied. HyperWorks software was used to carry out finite element analysis of the frame, the stress distribution under static stress analysis conditions was obtained, and the fatigue damage hotspot of the frame was determined. On the basis of data analysis, the strain gauges were pasted, and the dynamic strain test system was set up to collect the load time history under typical working conditions of field vegetable power machinery. The measured strain time history data was preprocessed, and the force of the frame under the corresponding working conditions was analyzed. The load spectrum was compiled by nCode software, and the fatigue analysis and life prediction of the frame were performed. Based on the analysis and life prediction, the topology optimization was proposed, and a multi-objective topology optimization mathematical model with multiple frame conditions and dynamic low-order natural frequency response was constructed to carry out lightweight design. The test results showed that the fatigue life at the cross weld of the frame was 7.5×104 h, the fatigue life was the shortest among the 15 points, which met the service life requirement, and the overall structural strength of the frame was over-designed. The optimized frame quality was reduced by 443.55 kg, which was reduced by 53.47%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Fatigue of materials

Controlled terms: Computer aided engineering? - ?Dynamic loads? - ?Frequency response? - ?Machinery? - ?Multiobjective optimization? - ?Stress analysis? - ?Structural optimization? - ?Topology? - ?Vegetables

Uncontrolled terms: Frame? - ?Multi objective? - ?Optimization design? - ?Power machinery? - ?Static stress analysis? - ?Stress-strain tests? - ?Structural strength? - ?Structure optimization

Classification code: 408.1 Structural Design, General? - ?723.5 Computer Applications? - ?821.4 Agricultural Products? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory? - ?921.5 Optimization Techniques? - ?951 Materials Science

Numerical data indexing: Mass 4.44e+02kg, Percentage 5.35e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.063

Compendex references: YES

Database: Compendex

58. Air Flow Field Numerical Simulation and Test of Hammer Rubbing Machine

Accession number: 20191406729526

Authors: Liu, Fei (1); Wang, Wei (1); Zhang, Tao (1); Ma, Qian (1); Zhao, Manquan (1)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China

Corresponding author: Zhao, Manquan(nmgzhaomq@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 227-232

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Straw rubbing machine has many problems such as high energy consumption, low efficiency and high production cost, which seriously restrict the promotion and development of rubbing machine. In order to achieve efficient rubbing, the relationship between the hammer of rubbing machine structure parameters and rubbing efficiency was studied. From the perspective of aerodynamics, the relationship between rubbing machine cavity flow field structure and material movement in T type structure of hammer excitation was analyzed. And then the T type hammer excitation rubbing machine cavity flow field pressure distribution and velocity field distribution were obtained by using computational fluid dynamics (CFD) technology. The simulation results showed that the rubbing machine cavity air axial velocity gradient was large, and the transport characteristics of suspension circulation layer were high. The axial air velocity was increased gradually, and the flow field velocity gradient was obvious. Validation test was designed, and the simulation results of wind speed and test values were compared. Results showed that the simulation results were in agreement with the experimental values, and the maximum relative error of the two was about 8%. The results also showed that the numerical simulation of the flow field in the type 9R-40 straw rubbing machine was reasonable which can correctly indicate the distribution of flow field when the machine was no-load. The flow structure inside the machine can provide a new direction to optimize the rubbing, and also provide a theoretical basis for the optimization design of mechanical rubbing. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Flow fields

Controlled terms: Air? - ?Computational fluid dynamics? - ?Computer simulation? - ?Energy utilization? - ?Hammers? - ?Numerical models? - ?Rubber machinery? - ?Velocity? - ?Wind

Uncontrolled terms: Experimental values? - ?Hammer excitations? - ?High energy consumption? - ?Maximum relative errors? - ?Optimization design? - ?Rubbing machines? - ?Transport characteristics? - ?Velocity gradients

Classification code: 443.1 Atmospheric Properties? - ?525.3 Energy Utilization? - ?605.2 Small Tools, Unpowered? - ?631.1 Fluid Flow, General? - ?723.5 Computer Applications? - ?804 Chemical Products Generally? - ?818.4 Rubber Factories and Machinery? - ?921 Mathematics

Numerical data indexing: Percentage 8.00e+00%

DOI: 10.6041/j.issn.1000-1298.2018.S0.030

Compendex references: YES

Database: Compendex

59. Canopy Information Acquisition Method of Fruit Trees Based on Fused Sensor Array

Accession number: 20191406729542

Authors: Liu, Limin (1); Wang, Jinyu (2); Mao, Wenhua (3); Shi, Guangzhi (2); Zhang, Xiaohui (1); Jiang, Honghua (2)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) College of Information Science and Engineering, Shandong Agricultural University, Tai’an; 271018, China; (3) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Jiang, Honghua(j_honghua@sdau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 347-353 and 359

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to distinguish different sparse degrees of top, middle and bottom canopy in orchard, canopy information acquisition method of fruit trees was proposed based on fused sensor array. First of all, the wireless acquired system was designed, which was used to collect canopy width information in orchard. And in order to verify sensor ability to recognize objects in motion, the dynamic recognition capability of six non-contact distance sensors was compared and analyzed. Secondly, laser sensors and ultrasonic sensors array which were filtrated to collect canopy information was used, which incorporated sparse degree and width of top, middle and bottom canopy in three kinds of orchard. Finally, fused sensor array that was suitable for three kinds of orchard was selected. According to Box-Benhnken center combination test method, the orthogonal experiment was designed, including three factors and three levels. And appropriate ranging scheme was selected by response surface experiments and the results of testing were statistically analyzed. The significance level of the overall measurement accuracy of fruit trees from large to small was ranging scheme,car-body speed and orchard type in turn.When vehicle speed was 0.3~0.5 m/s, using ultrasonic sensor array to collect canopy information of orchard, the relative error was 14.70%~20.04%. When laser sensor array was used to collect canopy information of orchard, its relative error was 9.13%~16.02%. And when fused sensor array was used for three orchards, its relative error was 4.2%~10.24%. Therefore, the fused sensor array scheme was more accurate than the single sensor array, and it was more suitable for the orchard variable spray operation. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Orchards

Controlled terms: Errors? - ?Forestry? - ?Fruits? - ?Information fusion? - ?Sensor arrays? - ?Surface properties? - ?Testing? - ?Ultrasonic sensors

Uncontrolled terms: Distance sensors? - ?Dynamic recognition? - ?Fruit trees? - ?Information acquisitions? - ?Measurement accuracy? - ?Orthogonal experiment? - ?Response surface? - ?Significance levels

Classification code: 753.2 Ultrasonic Devices? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?903.1 Information Sources and Analysis? - ?951 Materials Science

Numerical data indexing: Velocity 3.00e-01m/s to 5.00e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.046

Compendex references: YES

Database: Compendex

60. Design and Experiment of Fertilizer Amount Control Algorithm in Four Factors Variable Rate Fertilization System

Accession number: 20191406729516

Authors: An, Xiaofei (1, 2); Wang, Xiaoou (3); Fu, Weiqiang (1, 2); Wei, Xueli (1); Wu, Guangwei (1); Li, Liwei (1)

Author affiliation: (1) Beijing Research Center of Information Technology for Agriculture, Beijing; 100097, China; (2) National Research Center of Information Technology for Agriculture, Beijing; 100097, China; (3) Science Information Center, Heilongjiang Farm and Land Reclamation Administration, Harbin; 150036, China

Corresponding author: Fu, Weiqiang(fuwq@nercita.org.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 149-154

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In view of the Heilongjiang agricultural reclamation region fertilizer layered problems, a variable rate fertilization control system was developed. It consisted of the vehicle intelligent terminal, the variable rate fertilization controller, four channel speed sensor, four channel hydraulic motor, four channel fertilizer components, GNSS receiver and work status sensor. In order to apply the fertilizer of nitrogen, phosphorus, potassium and micronutrient accurately, a new fertilizer amount strategy with the compound crossover principle was proposed. And then with the PID technology, hydraulic motor control algorithm was designed. When the system started to work, according to the set target values of N, P and K, the actual value of N, P and K would be determined automatically with the corresponding strategy. Subsequently, the hydraulic motor speed would be calculated. Nitrogen fertilizer, phosphate fertilizer, potassium fertilizer and micronutrient fertilizer could be fertilized at one time. In order to verify the effect of the fertilizer amount control algorithm, three experiments were carried out. The results showed that the distributing shaft based on PID control algorithm of response time was less than 0.5 s, the system of variable rate fertilization elemental performance error absolute value was no more than 3%. Under the operating condition, it could reduce the use of nitrogen fertilizer obviously and more accurate for N, P and K than that without the algorithm. The control algorithm of the fertilizer amount of the four-factor variable fertilizer application machine completely satisfied the requirements of precise and uniform application of maize fertilization in reclamation area. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Nitrogen fertilizers

Controlled terms: Algorithms? - ?Hydraulic machinery? - ?Hydraulic motors? - ?Nutrients? - ?Phosphate fertilizers? - ?Potassium fertilizers? - ?Three term control systems? - ?Trace elements

Uncontrolled terms: Fertilizer applications? - ?Fertilizing amount? - ?Intelligent terminal? - ?Motor control algorithms? - ?Operating condition? - ?Reclamation areas? - ?Ridge growing maize? - ?Variable rate fertilization

Classification code: 632.2 Hydraulic Equipment and Machinery? - ?731.1 Control Systems? - ?804 Chemical Products Generally? - ?804.2 Inorganic Compounds

Numerical data indexing: Percentage 3.00e+00%, Time 5.00e-01s

DOI: 10.6041/j.issn.1000-1298.2018.S0.020

Compendex references: YES

Database: Compendex

61. Analysis and Experiment of Filming Mechanism of Rotary Film-lifting Device of Residual Film Recycling Machine

Accession number: 20191406729536

Authors: Sun, Yue (1); Jian, Jianming (1); Tian, Yutai (1); Sun, Fachao (1); Zhang, Mengjie (1); Wang, Shiguo (2)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi; 832000, China

Corresponding author: Jian, Jianming(jamesjian@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 304-310

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A rotary film-lifting device was proposed in view of the problems of low filming rate, difficult separation of membrane soil and low work reliability. Through the force and movement analysis of membrane mixture in the membrane process of the device, the conditions for the membrane and soil to be thrown away and the conditions for the residual membrane to be “stucked” by the spring teeth were determined. Through the analysis of the mechanism of filming, the horizontal distance and vertical distance between the rotating speed of knife shaft, the knife cutting axis and film spring were taken as experimental factors, and the filming rate, recovery rate and soil fraction were taken as the response indicators. The three-factor and three-level tests were designed by using the Box-Benhnken Design method in Design-Expert software, and the influence of various factors on the quality of the work was analyzed. The test results showed that the descending order of influence of filming rate was filming-cutter shaft speed, vertical distance and horizontal distance; the descending order of recovery rate was filming-cutter shaft speed, horizontal distance and vertical distance; the descending order of soil rate was film cutter shaft speed, vertical distance and horizontal distance. The four-dimensional slice diagram of the above three factors was plotted in Matlab 2016a software to analyze the comprehensive effect of each factor on the response indicators. The analysis results showed that with the increase of rotating speed of the knife shaft, the filming rate was increased. The higher the rotating speed of the knife shaft was, the more the horizontal distance was. After comprehensive optimization of the influencing factors, the optimal working parameter combination was obtained. The speed of the film-cutting shaft was 680 r/min, and the horizontal distance between the film-cutting shaft and the transporting elastic teeth was 250 mm. The vertical distance between the teeth was 320 mm. The above combination was tested in the field, the filming rate was 90.1%, the recovery rate was 89.5%, and the soil rate was 11.8%. The results showed that the optimization scheme of the device was feasible. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Speed

Controlled terms: MATLAB? - ?Membranes? - ?Recovery? - ?Rotating machinery? - ?Software testing? - ?Soils

Uncontrolled terms: Box-benhnken designs? - ?Comprehensive effect? - ?Comprehensive optimizations? - ?Experimental factors? - ?Field test? - ?Lifting devices? - ?Mechanism analysis? - ?Residual films

Classification code: 483.1 Soils and Soil Mechanics? - ?601.1 Mechanical Devices? - ?723.5 Computer Applications? - ?951 Materials Science

Numerical data indexing: Percentage 8.95e+01%, Percentage 9.01e+01%, Rotational_Speed 6.80e+02RPM, Size 2.50e-01m, Size 3.20e-01m, Percentage 1.18e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.040

Compendex references: YES

Database: Compendex

62. Design of D-type Knotter Based on TRIZ Theory

Accession number: 20191406729539

Authors: Ma, Sai (1); Li, Fengming (1); Qian, Wang (1)

Author affiliation: (1) Hohhot Branch of Chinese Academy of Agricultural Mechanization Sciences Co., Ltd., Huhhot; 010020, China

Corresponding author: Qian, Wang(qianwang0319@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 327-331

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Invention problem solving theory (TRIZ) is a systematic methodology system that guides people to innovate and solve engineering problems. The knotter is the core part of the forage picking and baling machine. Its main function is to tie the baling rope of enveloping grass into a solid and reliable knot. Each picking and baling machine is equipped with multiple sets of knotter as required and installed on the main shaft of the knotter together. Knot for picking and baling machine frame body dismantling trouble and difficult to repair and replacement after damage, arising from resulting work stoppage, slowdown productivity fell sharply, and application of the theory of TRIZ innovative methods were analyzed. Through the description of the existing problems, the causality analysis was carried out by using fishbone diagram to find out the cause of the problems and point out the direction for further solving the problems. Through functional analysis, the initial solution of the problem was found out, and then the contradiction analysis method was applied to get the final solution of the problem. By TRIZ theory analysis, the final solution of simple described as knot in the shaft hole of the frame body were inlaid self-lubricating bushings, an engineering plastics with engineering plastics for the collar base makings, joining the reinforcing fiber and solid uniform synthetic grease, wear-resisting effect, and increasing the whole strength of the fiber can improve the bearing and edge under the pressure of ability, and realizing the high pressure resistance, high heat dissipation and creep force, at the same time, it had a good friction performance. Tests results showed that the average failure-free time of the new knotter was raised to 115 000 bales, which greatly exceeded national standards and design requirements. It was proved by practice that the application of TRIZ can greatly accelerate the process of invention and creation and obtain high-quality innovative products. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Problem solving

Controlled terms: Design? - ?Elastomers? - ?Heat resistance? - ?High pressure effects? - ?High pressure engineering? - ?Patents and inventions

Uncontrolled terms: Contradiction analysis? - ?Engineering plastics? - ?Friction performance? - ?High pressure resistance? - ?Invention and creations? - ?Knotter? - ?Systematic methodology? - ?TRIZ

Classification code: 818.2 Elastomers

DOI: 10.6041/j.issn.1000-1298.2018.S0.043

Compendex references: YES

Database: Compendex

63. Spores Detection of Rice Blast by IKSVM Based on HOG Features

Accession number: 20191406729446

Authors: Wang, Zhen (1, 2); Chu, Guikun (1); Wang, Jinxing (1, 2); Huang, Xincheng (3); Gao, Farui (3); Ding, Xinhua (4)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipment, Tai’an; 271018, China; (3) Jining Agricultural Research Institute, Jining; 273013, China; (4) College of Plant Protection, Shandong Agricultural University, Tai’an; 271018, China

Corresponding author: Wang, Jinxing(jinxingw@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 387-392

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the disadvantages such as strong subjectivity, low automation and low efficiency of spores detection in rice blast, an additive intersection kernel support vector machine (IKSVM) based on histogram of oriented gradient feature (HOG feature) was proposed to detect rice blast spores. Firstly, the image acquisition system was used to collect spores images of rice blast disease, and Gamma correction was used to adjust the contrast of the images to suppress noise interference. Secondly, the HOG feature of the spores image was extracted as input vectors and input into the support vector machine to construct the intersection kernel support vector machine classifier. Finally, the rice blast spores classifier was obtained by training. In order to test the comprehensive performance of proposed HOG/IKSVM, the HOG/linear SVM method and the HOG/radial basis function kernel SVM (RBF-SVM) method were used for the comparison test. The test results showed that the detection rate of HOG/IKSVM was 98.2%, which was higher than the 79% of the HOG/linear SVM method. On average detection time, the average detection time of HOG/IKSVM was only 1.1% of the HOG/RBF-SVM method. This method can be used as a rapid and accurate identification method for indoor detection of rice blast. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Feature extraction

Controlled terms: Image processing? - ?Support vector machines? - ?Vectors

Uncontrolled terms: Comprehensive performance? - ?Histogram of oriented gradient features? - ?HOG feature? - ?Identification method? - ?Image acquisition systems? - ?Image identification? - ?Rice blasts? - ?Support vector machine classifiers

Classification code: 723 Computer Software, Data Handling and Applications? - ?921.1 Algebra

Numerical data indexing: Percentage 1.10e+00%, Percentage 7.90e+01%, Percentage 9.82e+01%

DOI: 10.6041/j.issn.1000-1298.2018.S0.052

Compendex references: YES

Database: Compendex

64. Design and Experiment of Wheat Planter by Pneumatic Conveying with No-tillage

Accession number: 20191406729515

Authors: Yu, Xingrui (1); Geng, Duanyang (1); Du, Ruicheng (1); Jin, Chengqian (1); Yang, Shandong (1); Lu, Xiufeng (2)

Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255049, China; (2) Shandong Polytechnic College, Jining; 272067, China

Corresponding author: Geng, Duanyang(dygxt@sdut.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 141-148

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: At present, the land management mode in Shandong has changed. The rotation system of wheat and corn is two ripe for one year. The situation causes wheat sowing time become tense, and the existing machinery is inefficient. In order to solve the above problems, a kind of wheat planter was developed by pneumatic conveying with no-tillage. The seeding machine can finish stubble, fertilizing, sowing, covering and pressing at one time. The pneumatic conveying seeds/fertilizers device was utilized in seeds and fertilizers discharging device of wheat planter, which used the same air duct to simultaneously transport the discharged seeds and fertilizers. The form of seeds/fertilizers transportation was the combination of mechanical trough wheel and pneumatic conveying. The diameter of the grooved wheel was 60 mm and its effective length was 1 100 mm. This kind of seeds metering device could improve the efficiency and uniformity of seeds/fertilizers at the same time, which ensured the synchronization of seeds/fertilizers. And the velocity of air flow was determined to be 24 m/s. The seeds and fertilizers settling chamber were designed according to the principle of cyclone separator. Their diameter was determined to be 102 mm, and the ratio of height to height was 3.5. According to the agricultural requirements of wide band seedling, the structure of wide mouth swallowtail type seeds arrangement device was adopted. The shape of the seeds outlet was “saddle” with high in the middle and low on both sides. The width of the seedling band could reach 12 cm. The soil covering device was counter rotating auger to cover the soil from both sides to the middle. It could effectively ensure the consistency of the covering depth and the smoothness of the surface after sowing, which laid the foundation for the uniformity of planting depth. The whole machine was tested in the field. The test results showed that the machine with good trafficability characteristic. The qualification rate of seeds depth was 93.0%, the qualified rate of fertilizers depth was 93.6% and the qualified rate of spacing between seeds and fertilizers was 85.4%. The coefficient of variation was 4.7%, 2.8% and 5.3%, respectively. The average width of the seedling belt was 11.83 cm. The qualified rate was 94.5% with the coefficient of variation of 4.2%. The indexes fully conformed to the requirements of the design and agronomy. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Seed

Controlled terms: Air? - ?Design? - ?Experiments? - ?Fertilizers? - ?Machinery? - ?Pneumatic conveyors? - ?Pneumatics? - ?Soil testing? - ?Storms? - ?Wheels

Uncontrolled terms: Coefficient of variation? - ?Counter rotating? - ?Land managements? - ?No tillage? - ?Planter? - ?Pneumatic conveying? - ?Settling chambers? - ?Wheat

Classification code: 443.3 Precipitation? - ?483.1 Soils and Soil Mechanics? - ?601.2 Machine Components? - ?632.3 Pneumatics? - ?632.4 Pneumatic Equipment and Machinery? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products? - ?901.3 Engineering Research

Numerical data indexing: Percentage 2.80e+00%, Percentage 4.20e+00%, Percentage 4.70e+00%, Percentage 5.30e+00%, Percentage 8.54e+01%, Percentage 9.30e+01%, Percentage 9.36e+01%, Percentage 9.45e+01%, Size 1.02e-01m, Size 1.10e+00m, Size 1.18e-01m, Size 1.20e-01m, Size 6.00e-02m, Velocity 2.40e+01m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.019

Compendex references: YES

Database: Compendex

65. Design and Experiment of Strip Cleaning Device of No and Minimum-tillage Corn Planter

Accession number: 20191406729514

Authors: Liu, Junxiao (1); Wang, Hao (1); Wang, Qingjie (1); Li, Shaohua (2); Li, Hongwen (1); He, Jin (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Inner Mongolia Changming Machinery Co., Ltd., Chifeng; 024200, China

Corresponding author: Wang, Qingjie(wangqingjie@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 132-140

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Under the conditions of straw mulching in the northeast of China, straw plugging problem often occurs when sowing corn. After the strip-rotating anti-blocking operation, soil and stalks mixing generate some seeds landed on the straw, which reduced seeding quality. Combined with the agronomic and operational requirements for corn planting in the one-year-old ripe area in Northeast China, a device for eliminating stubbles and cleaning seed bed was designed, which was suitable for seeding corn under no-tillage condition. The device was mainly composed of a cutter head, a stubble cutter, a planting-strip cleaning knife and a spring assembly. Force and side-cutting edge curve analysis were performed and the main technical parameters of the two cutting tools were designed. The force model was established for cleaning straws or weeds with planting-strip cleaning knife, and different bending angles were simulated by EDEM discrete element simulation. Using cutting resistance as the optimization indicator, it was confirmed that the optimum bending angle of the planting-strip cleaning knife was determined to be 150°. The cleanliness and soil disturbance after the operation of the two devices were analyzed and compared. The results showed that the average cleanliness of the strips after operation was 86.59%, which was 26.89% higher than that of the traditional strip annihilation device and the soil disturbance quantity was reduced by 2/3, and average torque was reduced by 33.19%. The test and simulation results were basically the same, verifying the reliability of the simulation. In order to study the influence of various factors on the operation performance of the stripping and cleaning device, a three-factor and three-level orthogonal test was designed to determine the factors that had significant impact on the cleanliness of the strip were the working speed and amount of straw mulching, and those on the soil disturbance were the working speed and depth of soil. Field experiments showed that the equipment had good passability and significant anti-blocking effect when straw cover rate was in range of 0.4~1.4 kg/m2. The seed bed cleanliness was all above 80%. The research provided the theoretical and technological support for the development of seed bed cleaning devices under the condition of no and minimum-tillage planting. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Cleaning

Controlled terms: Cutting? - ?Cutting tools? - ?Plants (botany)? - ?Seed? - ?Soils

Uncontrolled terms: Discrete element simulation? - ?EDEM? - ?Main technical parameters? - ?Maize? - ?Minimum tillage? - ?Operation performance? - ?Operational requirements? - ?Technological supports

Classification code: 483.1 Soils and Soil Mechanics? - ?603.2 Machine Tool Accessories? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products

Numerical data indexing: Percentage 2.69e+01%, Percentage 3.32e+01%, Percentage 8.00e+01%, Percentage 8.66e+01%, Surface_Density 4.00e-01kg/m2 to 1.40e+00kg/m2

DOI: 10.6041/j.issn.1000-1298.2018.S0.018

Compendex references: YES

Database: Compendex

66. Optimization of Parameters for Stalk Chopper of Corn Harvester for Reaping both Corn Stalk and Spike

Accession number: 20191406729531

Authors: Zhang, Zongling (1); Han, Zengde (2); Li, Xiaodong (3); Hao, Fuping (3); Han, Keli (3); Han, Lujia (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (3) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China

Corresponding author: Han, Zengde(jszx000@sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 266-274

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: As a corn harvester for reaping both corn stalk and spike needs high efficiency and performance to harvest corn cob and corn stalk, a stalk chopper (SC) in horizontal roller type was designed. Aiming at studying the effect of parameters of chopper on picking and smashing performance, the working principle of SC was analyzed. Box-Benhnken Design(BBD)response surface method was used to design the field experience. An orthogonal rotary combination experiment was conducted with the working speed of corn harvester, the fixed angle of cutting knives and rotating speed of SC as three independent factors, as well as broken rate and loss rate of corn kernels, average length and geometric standard deviation of smashed corn stalk as four dependent indices, while using corn named Zhengdan as the test materials. Corn cobs, kernels and stalks were collected manually and calculated to get the results after every experiment. Design-Expert software was employed to analyze the test data, and mathematical equations between independent and dependent factors were gained. The results indicated that the independent factors had a second nonlinear relationship with dependent indices, while only working speed of corn harvester and rotating speed of SC had significant effects on loss rate of corn kernels. Three factors all had significant effects on other dependent indices. The interaction between working speed of corn harvester and rotating speed of SC had a significant effect on broken rate of corn kernels and average length of corn stalk. Parameters optimization showed that when working speed of corn harvester was 1.35 m/s, the fixed angle of cutting knives was 52°, rotating speed of SC was 1 350 r/min, the device had optimal performance with loss rate of corn ear of 1.1%, broken rate of corn kernels of 0.23%, loss rate of corn kernels of 0.74%, average length of broken stem of 30.73 mm, and geometric deviation of 1.28. Compared with field test results, it was showed that the regression equation had a good prediction. In contract to the test with working speed of 1.11 m/s, fixed angle of 53°, rotating speed of 1 657 r/min, the results showed that under optimal conditions loss rate of corn ear, broken rate of corn kernels, loss rate of corn kernels, average length of broken stem and geometric deviation were reduced by 0.4%, 0.784%, 1.318%, 12.20 mm and 0.34, respectively. The research result provided a basis for the stalk chopper of corn harvester for reaping both corn stalk and spike. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Harvesters

Controlled terms: Choppers (circuits)? - ?Geometry? - ?Rotating machinery? - ?Software testing? - ?Speed

Uncontrolled terms: Chopping device? - ?Corn harvesters? - ?Field test? - ?Parameter optimization? - ?Reaping stalk and spike

Classification code: 601.1 Mechanical Devices? - ?723.5 Computer Applications? - ?821.1 Agricultural Machinery and Equipment? - ?921 Mathematics

Numerical data indexing: Percentage 1.10e+00%, Percentage 1.32e+00%, Percentage 2.30e-01%, Percentage 4.00e-01%, Percentage 7.40e-01%, Percentage 7.84e-01%, Rotational_Speed 1.35e+03RPM, Rotational_Speed 1.66e+03RPM, Size 1.22e-02m, Size 3.07e-02m, Velocity 1.11e+00m/s, Velocity 1.35e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.S0.035

Compendex references: YES

Database: Compendex

67. FMECA Method Based on Fuzzy Comprehensive Evaluation

Accession number: 20191406729540

Authors: Hu, Wenze (1); He, Ke (1); Jin, Chengqian (1); Geng, Duanyang (1); Zhang, Guohai (1); Lu, Xiufeng (2)

Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255049, China; (2) Shandong Polytechnic College, Jining; 272000, China

Corresponding author: Geng, Duanyang(dygxt@sdut.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue date: November 16, 2018

Publication year: 2018

Pages: 332-337

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The enhanced functions and complex structure of agricultural machinery lead to serious consequences of failure. During reliability analysis of products, many evaluation elements are involved and failure information and evaluation indexes are fuzzy, so it is difficult to give credible and accurate analysis results. In view of these problems, the fuzzy comprehensive evaluation was introduced into the traditional method of failure mode effect and criticality analysis (FMECA), and the new FMECA analysis method based on fuzzy comprehensive evaluation was formed. Factors set, evaluation set, judgement matrix for fuzzy factors and weights set were established to quantify the qualitative evaluation index. Taking the vertical corn threshing test bed as a case, analysis table for failure modes and effects analysis (FMEA) was established and criticalities of failure modes in the table were evaluated. According to the criticality, failure modes were ranked and emphases of reliability improvement were found. The analysis procedure and method were verified. The result showed that the method had obvious accuracy and comparability, which provided scientific and accurate decision basis for the structural optimization and formulation of maintenance program of agricultural machinery. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Reliability analysis

Controlled terms: Agricultural machinery? - ?Agriculture? - ?Criticality (nuclear fission)? - ?Failure modes? - ?Fuzzy set theory? - ?Reliability? - ?Safety factor? - ?Structural optimization

Uncontrolled terms: Evaluation elements? - ?Failure information? - ?Failure mode , effect and criticality analysis? - ?Failure modes and effects analysis? - ?Fuzzy comprehensive evaluation? - ?Maintenance programs? - ?Qualitative evaluations? - ?Reliability improvement

Classification code: 621 Nuclear Reactors? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.1 Agricultural Machinery and Equipment? - ?914.1 Accidents and Accident Prevention? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory? - ?921.5 Optimization Techniques

DOI: 10.6041/j.issn.1000-1298.2018.S0.044

Compendex references: YES

Database: Compendex