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2013年第44卷第3期共收录46篇 1. Accession number:20131416174950 Title:Effect of glycosylation reaction on gel rheological properties for soybean 7s globulin Authors:Chi, Yujie1 ; Jiang, Jian1 ; Zhao, Wei1 Author affiliation:1 College of Food Science, Northeast Agricultural University, Harbin 150030, China Corresponding author:Chi, Y. (yjchi@126.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:167-173 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Glucose was used as an agent to modify soybean 7s globulin, in order to prepare for three glycation products of soybean 7s globulin. Rotary rheometer, texture analyzer and scanning electron microscope were used to analyze rheology, texture and microstructure of soybean 7s globulin and its glycosylation product gel, in order to study the effect of glycosylation reaction on 7s globulin gel. Research results showed that glycosylation reaction could improve the thermal stability of soybean 7s globulin and move up the soybean 7s globulin gel point. The viscoelasticity of the soybean 7s globulin gel was increased. The sugar chains could promote the formation of the soybean 7s globulin gel network. Number of references:25 Main heading:Oilseeds Controlled terms: Elasticity - Esterification - Gels - Glycosylation - Rheology - Scanning electron microscopy - Textures Uncontrolled terms:Gel networks - Glycosylation reactions - Research results - Rheological property - Scanning Electron Microscope - Soybean 7s globulin - Texture analyzers - Texture and microstructures Classification code:933 Solid State Physics - 931.1 Mechanics - 821.4 Agricultural Products - 804 Chemical Products Generally - 802.2 Chemical Reactions - 741.1 Light/Optics - 461.9 Biology - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties DOI:10.6041/j.issn.1000-1298.2013.03.031 Database:Compendex 2. Accession number:20131416174940 Title:Effects of mixing ratio on hydrogen production from anaerobic co-fermentation of cattle manure and food waste Authors:Liu, Shuang1 ; Li, Wenzhe1 Author affiliation:1 College of Engineering, Northeast Agricultural University, Harbin 150030, China Corresponding author:Li, W. (liwenzhe9@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:114-118 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Evaluation of anaerobic co-fermentation of cattle manure (CM) and food waste (FW) was conducted in bath test at 35°C. Effects of mixing ratio on hydrogen yield, pH value, composition of dissolved fermentation products, and VS degradation rate were investigated. Results showed that a mixing ratio of 40:40 would significantly enhance the efficiency of hydrogen production, and the maximums of hydrogen yield and VS degradation rate (17 mL/g and 27.9%, respectively) were obtained. It is found that mixing ratios lead to different fermentation type. Mixing ratio of 40:40 achieved pH value of 5.5 and butyric acid type fermentation. At multi-FW case, phenomenon of no hydrogen production, ethanol as dominant dissolved fermentation products and pH value below 4.0 was observed. As far as case of multi-CM, low hydrogen production rate was achieved as well as acetic acid as dominant dissolved fermentation products and pH value above 6.0. Number of references:24 Main heading:Fermentation Controlled terms: Degradation - Dissolution - Hydrogen - Hydrogen production - Manures - Mixing - pH Uncontrolled terms:Anaerobic co fermentations - Cattle manures - Cofermentation - Degradation rate - Fermentation products - Fermentation type - Food waste - Hydrogen production rate Classification code:452.3 Industrial Wastes - 522 Gas Fuels - 801.1 Chemistry, General - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804 Chemical Products Generally DOI:10.6041/j.issn.1000-1298.2013.03.021 Database:Compendex 3. Accession number:20131416174924 Title:DOC assisted DPF regeneration under idle condition Authors:Zhang, Deman1 ; Wang, Zhengqing1 ; Ma, Shihu1 ; Li, Wei1 ; Bao, Xiaofeng2 ; Li, Kai2 Author affiliation:1 Wuhan Second Ship Design and Research Institute, Wuhan 430064, China 2 Chinese Research Academy of Environment Sciences, Beijing 100012, China Corresponding author:Zhang, D. (lin1985101@sina.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:24-27 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Diesel oxidation catalyst was installed in front of diesel particulate filter. The engine exhaust temperature was improved by insufflating diesel oil into vent-pipe upriver diesel oxidation catalyst. The engine exhaust flow was reduced to further improve the exhaust gas temperature and achieve the regeneration of diesel particulate filter. The system was consisted of fuel injector, diesel oxidation catalyst and diesel particulate filters. Study on regeneration characteristics of this system on engine test-bed, including the temperature characteristics of the diesel oxidation catalyst in regeneration, the relationship of injection flow rate and temperature, DPF regeneration process and the fuel economy and secondary pollution of regeneration. The results demonstrates that DOC assisted DPF regeneration can be successfully achieved under idle condition, diesel oil consumption under regeneration process is 120.5 g, emissions of CO and HC under regeneration process are 12.4 g and 1.1 g, respectively. Number of references:11 Main heading:Exhaust gases Controlled terms: Air filters - Diesel engines - Diesel fuels - Exhaust systems (engine) - Fuel economy - Fuel filters Uncontrolled terms:Diesel oxidation catalyst - Diesel particulate filters - Exhaust gas temperatures - Exhaust temperature - Regeneration - Regeneration process - Secondary pollution - Temperature characteristic Classification code:521 Fuel Combustion and Flame Research - 522 Gas Fuels - 523 Liquid Fuels - 612 Engines - 802.1 Chemical Plants and Equipment DOI:10.6041/j.issn.1000-1298.2013.03.005 Database:Compendex 4. Accession number:20131416174956 Title:Cucumber image segmentation based on weighted connection coefficient pulse coupled neural network Authors:Wang, Haiqing1 ; Ji, Changying1 ; Gu, Baoxing1 ; Tian, Guangzhao1 Author affiliation:1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, China Corresponding author:Ji, C. (chyji@njau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:204-208 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Parameters of pulse coupled neural network (PCNN) were simplified and adaptive to determine. Spatial information and gray information of image were coupled to the weighted connection coefficient for greenhouse cucumber segmentation by using the 2-D Tsallis entropy to select the best results of iteration. Experimental results showed that, methods of contrast and regional consistency were employed to evaluate effect of different segmentation. Segmentation results of prospered method was better than using Shannon entropy and minimum cross entropy to terminate iteration of standard pulse coupled neural network segmentation. Number of references:11 Main heading:Image segmentation Controlled terms: Computer vision - Iterative methods - Neural networks Uncontrolled terms:Connection coefficients - Cucumber - Greenhouse cucumbers - Minimum cross entropy - Pulse coupled neural network - Segmentation results - Self-adaptive - Spatial informations Classification code:723.4 Artificial Intelligence - 723.5 Computer Applications - 741.1 Light/Optics - 921.6 Numerical Methods DOI:10.6041/j.issn.1000-1298.2013.03.037 Database:Compendex 5. Accession number:20131416174947 Title:Variety identification of pears based on effective wavelengths in visible/near infrared region Authors:Li, Jiangbo1 ; Zhao, Chunjiang1 ; Chen, Liping1 ; Huang, Wenqian1 Author affiliation:1 Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China Corresponding author:Huang, W. (huangwq@nercita.org.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:153-157 179 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Based on least squares-support vector machine (LS-SVM), the effective wavelength (EW) in visible/near infrared (Vis/NIR) region was proposed as a new approach for the variety discrimination of pears. 210 pear samples were used for the calibration set, while 30 samples for the validation set. After partial least squares (PLS) analysis, the EWs were selected according to the X-loading weights and regression coefficients, and an EW-LS-SVM model was developed for the variety discrimination. This model was compared with EW-BP-ANN model by using back-propagation artificial neural network (BP-ANN). Results showed that the same recognition accuracies (100% for the calibration set, 93.3% for the validation set) were obtained for EW-LS-SVM and EW-BP-ANN models, respectively. Studies show that it is feasible to use EW-LS-SVM model for the variety discrimination of pears. Number of references:19 Main heading:Support vector machines Controlled terms: Calibration - Fruits - Loading - Neural networks Uncontrolled terms:Effective wavelength - Least squares support vector machines - Pears - Variety identification - Visible/near infrared Classification code:943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 821.4 Agricultural Products - 723 Computer Software, Data Handling and Applications - 672 Naval Vessels - 723.4 Artificial Intelligence DOI:10.6041/j.issn.1000-1298.2013.03.028 Database:Compendex 6. Accession number:20131416174928 Title:Shut-down transient of bulb tubular pumping station with VFD Authors:Zhang, Rentian1 ; Zhu, Honggeng1 ; Li, Cixiang2 ; Yao, Linbi3 Author affiliation:1 College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China 2 Nanjing Water Planning and Design Ins., Ltd., Nanjing 210006, China 3 Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou 225009, China Corresponding author:Zhang, R. (r_zhang@yzu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:45-49 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The shut-down process of bulb tubular pumping station with VFD will be a stabile and safe transient process through the speed lowing gradually. The features of normal shut-down process with VFD were analyzed. The flowing rate balance and torque dynamic balance equations were established. According to the characteristics of the VFD, the speed lowing law was designed and the main hydraulic parameters were simulated during the shut-down transient period by the numerical calculation, the optimal combination between the speed-lowing, the starting time point and closing time of the gate was discovered. The findings of the study provided various shut-down suggestions for safety and stability operation of bulb tubular pumping stations with VFD. Number of references:10 Main heading:Pumping plants Controlled terms: Computer simulation Uncontrolled terms:Dynamic balance - Hydraulic parameters - Numerical calculation - Optimal combination - Pumping stations - Safety and stabilities - Transient periods - Transient process Classification code:446 Waterworks - 723.5 Computer Applications DOI:10.6041/j.issn.1000-1298.2013.03.009 Database:Compendex 7.Accession number:20131416174920 Title:Backfire mechanism and control of PFI hydrogen internal combustion engine Authors:Duan, Junfa1 ; Liu, Fushui1 ; Sun, Baigang1 Author affiliation:1 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China Corresponding author:Sun, B. (sunbg@bit.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:1-5 37 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:A 3-D simulation model including the inlet and the cylinder was built to study the backfire mechanism of PFI hydrogen internal combustion engines. A method controlling the backfire was put forward through optimizing the hydrogen injection angle. The low concentrated mixture gas was flow into the cylinder first after the intake valve opening, which can then lower the temperature of the exhaust gas and hot point inside the chamber. Based on the simulation model, the hydrogen injection angle influenced on the concentration and temperature of the mixture gas with the engine at different working speeds and conditions was investigated. The optimized hydrogen injection angle causing no backfire in all working conditions were found. It was proved by the experiment that the hydrogen internal combustion engine with the optimized hydrogen injection angle worked normally without backfire when the equivalent fuel air ratio of mixture gas reaching or even exceeding the stoichiometric fuel-air ratio within the speed range. Number of references:14 Main heading:Gases Controlled terms: Computer simulation - Fuel injection - Hydrogen - Intake valves - Internal combustion engines - Mixtures - Optimization - Three dimensional computer graphics Uncontrolled terms:3D simulations - Fuel-air ratios - Hydrogen injection - Hydrogen internal combustion engines - Ignition timing - Port fuel injections - Simulation model - Working speed Classification code:921.5 Optimization Techniques - 804 Chemical Products Generally - 802.3 Chemical Operations - 931.2 Physical Properties of Gases, Liquids and Solids - 723.5 Computer Applications - 612.1 Internal Combustion Engines, General - 521 Fuel Combustion and Flame Research - 631.1 Fluid Flow, General DOI:10.6041/j.issn.1000-1298.2013.03.001 Database:Compendex 8. Accession number:20131416174939 Title:Dry thermophilic anaerobic digestion performance test of dairy manure for biogas producing Authors:Li, Daoyi1 ; Li, Shujun2 ; Liu, Tianshu2 ; Huang, Xiguo2 ; Wu, Lili2 ; Jing, Quanrong2 Author affiliation:1 College of Engineering, China Agricultural University, Beijing 100083, China 2 Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China Corresponding author:Li, S. (lisj@caams.org.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:110-113 141 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Dry anaerobic digestion of dairy manure under thermophilic temperature (55°C) for biogas producing was investigated, including the effect of different inoculation ratios on biogas producing, and the changes of biogas and methane producing, pH value, concentrations of ammonia, volatile fatty acid and total alkalinity during digestion. Inoculated dairy manure (the ratio of inoculums and dairy manure was 3:10) was anaerobic digested 15 days under continuous mechanized mixing (8 r/min), and total solid biogas production, average daily biogas production, the maximum daily production and the average content of methane reached to 311 mL/g, 2.73 L/(L·d), 5.23 L/(L·d) (3rd day) and 57.1%, respectively. Number of references:14 Main heading:Biogas Controlled terms: Anaerobic digestion - Manures - Methane - pH - Volatile fatty acids Uncontrolled terms:Biogas and methanes - Biogas production - Dairy manures - Dry anaerobic digestions - Performance tests - Thermophilic anaerobic digestion - Thermophilic temperatures - Total alkalinities Classification code:452.3 Industrial Wastes - 452.4 Industrial Wastes Treatment and Disposal - 522 Gas Fuels - 801.1 Chemistry, General - 804.1 Organic Compounds DOI:10.6041/j.issn.1000-1298.2013.03.020 Database:Compendex 9. Accession number:20131416174964 Title:Finite element analysis and process optimization in closed precision-forging for shifting gear blank Authors:Zhou, Jie1 ; Zhang, Hui1 ; Zheng, Xiaokai1 ; Zeng, Detao1 Author affiliation:1 School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China Corresponding author:Zhou, J. (1755892083@qq.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:251-256 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Based on a rigid plastic finite element method, the surface defect of closed precision-forging process for shifting gear blank can be predicted. The metal forming process with different drafting angle and fillet radius in the die key part was simulated by using the orthogonal experimental method, and the initiation of surface defect was analyzed in detail. The reasonable forging critical diagram of shifting gear blank was given, which effectively eliminates fold and unfilled. Meanwhile, in view of the problems of the high position accuracy of ribs and the high forming load in actual practice, a new scheme of divided flow precision-forging was put forward, which can greatly improve rib position degree precision and reduce load. The accuracy of position degree was less than 0.08 mm, and the reduce load was reduced by 20%-40%. The new scheme was put into actual practice and the key problems of a closed precision-forging process for shifting gear were solved. The reliability of the numerical simulation was verified. Number of references:10 Main heading:Upsetting (forming) Controlled terms: Finite element method - Forgings - Optimization - Process control Uncontrolled terms:Closed precision-forging - Divided flow - Experimental methods - Fillet radius - Metal-forming process - Position accuracy - Rigid plastic finite element method - Shifting gear blank Classification code:535.2 Metal Forming - 731 Automatic Control Principles and Applications - 921.5 Optimization Techniques - 921.6 Numerical Methods DOI:10.6041/j.issn.1000-1298.2013.03.045 Database:Compendex 10.Accession number:20131416174937 Title:Spatial differences of soil resistivity and water moisture on grass slopes between Diedie and Yunwu Mountains Authors:Duan, Xu1 ; Li, Genqian1 ; Li, Lianfang1 ; Li, Xianzhong1 ; Wang, Yanhui2 Author affiliation:1 College of Forestry, Southwest Forestry University, Kunming 650224, China 2 Research Institute of Forestry Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China Corresponding author:Duan, X. (feixue20012360@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:97-103 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With the aim to understand the spatial distribution of soil moisture along slopes, the method of multi-electrode electrical resistivity tomography was used on two 400 m length grass slopes of Diedie and Yunwu Mountains as study area. Both the two longitudinal transect lines were set up to detect the soil resistivity and water moisture by more points simultaneously and continuously. Results showed that there was a good statistical correlation between soil resistivity and moisture content on Yunwu Mountain (R2=0.78), and this suggested that it was feasible to determine the spatial variation of soil moisture through measuring spatial distribution of soil resistivity on slope. On Yunwu Mountain, the soil electrical resistivity gradually increased from the top slope to the mid slope, and then decreased to the bottom. While, on Diedie Mountain, it decreased from the top slope to bottom gradually; the light, mild and severe dry layers occurred in 1-3 m, 3-4 m and 6-17 m soil layers on Yunwu Mountain respectively; While, on Diedie Mountain, the light and severe dry layers occurred in 3 m, 6 m and below 6 m soil layers respectively. Number of references:25 Main heading:Landforms Controlled terms: Electric conductivity - Moisture - Moisture determination - Soil moisture - Spatial distribution Uncontrolled terms:Electrical resistivity tomography - Loess Plateau - Slope - Soil electrical resistivities - Soil resistivity - Spatial differences - Spatial variations - Statistical correlation Classification code:481.1 Geology - 483.1 Soils and Soil Mechanics - 701.1 Electricity: Basic Concepts and Phenomena - 801.4 Physical Chemistry - 921 Mathematics - 944.2 Moisture Measurements DOI:10.6041/j.issn.1000-1298.2013.03.018 Database:Compendex 11. Accession number:20131416174925 Title:Particulate status of diesel engine fueled with ethanol/diesel blends Authors:Li, Mingdi1 ; Wang, Zhong1 ; Li, Lilin1, 2 ; Chen, Lin1 ; Li, Ruina1 Author affiliation:1 School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China 2 College of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 451191, China Corresponding author:Wang, Z. (wangzhong@ujs.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:28-32 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The particulate status characteristics of diesel engine particulate were studied by using thermo gravimetric analysis, scanning/transmission electron microscopy (SEM/TEM) and staged sampling particulate system methods. The variation of the composition, size distribution and microstructure of particulate with different ethanol ratios were studied. Results showed that soot accounted for about 75% of the total particulate mass. With the increase of ethanol ratios, the proportion of soluble organic fraction (SOF) increased and sulfate decreased. With the increase of ethanol ratios, the particulate of size range 0.78-1.4 μm decreased and the proportion of 0.25 μm increased. The distribution of particulate moved to small size. The particulate size decreased and agglomeration improved with the increase in the proportion of ethanol ratios. The microstructure of the particulate was polymerization, core-shell and disordered. Number of references:11 Main heading:Ethanol Controlled terms: Diesel engines - Electron microscopy - Microstructure - Particulate emissions - Thermogravimetric analysis Uncontrolled terms:Characteristic analysis - Diesel - Ethanol/diesel - Particulate mass - Particulate size - Particulate systems - Size ranges - Soluble organic fraction Classification code:451.1 Air Pollution Sources - 523 Liquid Fuels - 612.2 Diesel Engines - 801 Chemistry - 933 Solid State Physics - 951 Materials Science DOI:10.6041/j.issn.1000-1298.2013.03.006 Database:Compendex 12. Accession number:20131416174961 Title:Multi-objective optimization of hydrodynamic sliding bearing based on differential evolution algorithm Authors:Lu, Qingbo1, 2 ; Zhang, Xueliang1 ; Wen, Shuhua1 ; Lan, Guosheng1 ; Liu, Liqin1 Author affiliation:1 College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China 2 Zhengzhou Technical College, Zhengzhou 450121, China Corresponding author:Zhang, X. (zhang_xue_l@sina.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:230-236 245 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to solve multi-objective optimization problem of the hydrodynamic sliding bearing, a modified multi-objective differential evolution algorithm (MMODE) was proposed. The proposed algorithm provided a modified differential vector selection mechanism to improve the convergence speed and a population pruning strategy to maintain the population diversity. The vector selection mechanism compared two selected individuals and used the non-dominated individual minus the domination individual. Compared with several other evolutionary algorithms, the results showed that the proposed algorithm could overcome the premature convergence efficiently and had better convergence and diversity metrics. The results of engineering example showed the feasibility of the proposed algorithm. Number of references:17 Main heading:Evolutionary algorithms Controlled terms: Bearings (machine parts) - Hydrodynamics - Multiobjective optimization Uncontrolled terms:Differential evolution algorithms - Diversity metrics - Multi-objective differential evolution algorithms - Multi-objective optimization problem - Population diversity - Pre-mature convergences - Sliding bearing - Vector selections Classification code:601.2 Machine Components - 631.2 Hydrodynamics - 723 Computer Software, Data Handling and Applications - 921 Mathematics - 921.5 Optimization Techniques DOI:10.6041/j.issn.1000-1298.2013.03.042 Database:Compendex 13. Accession number:20131416174923 Title:Optimization match between IVCA and turbocharged system at middle load in diesel engines Authors:Han, Zhiqiang1 ; Zhan, Qiang1 ; Wu, Songlin1 ; Su, Wanhua1 Author affiliation:1 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China Corresponding author:Han, Z. (8312862@qq.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:17-23 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:A Weichai-WP12 heavy-duty diesel was taken as the research object and the influence on two-stage turbocharged system was researched, according to contrasting the two states of the IVCA which control mode was open or close. It was also analyzed that the effect on combustion process by key gas path parameters of diesel engines under each speed and middle load condition. The results show that the NOx and soot compromise exhaust emission was significantly declined by IVCA when the injection timing was delayed further after top dead center. At the same time, it was found that IVCA could decrease air intake flow and backpressure, and then it was considered as a useful way to improve the effective thermal efficiency when engines ran under high backpressure condition. The optimization matching process between boost system and IVCA under middle load working condition could come true if the influences of IVCA on operating principle of boost system were found , while the key air path parameters and fuel parameters was collaborated and controlled precisely. Number of references:11 Main heading:Diesel engines Controlled terms: Intake valves - Optimization Uncontrolled terms:Combustion pro-cess - Exhaust emission - Heavy-duty diesel - Match - Operating principles - Optimization matching - Thermal efficiency - Two stage turbocharged system Classification code:612.2 Diesel Engines - 631.1 Fluid Flow, General - 921.5 Optimization Techniques DOI:10.6041/j.issn.1000-1298.2013.03.004 Database:Compendex 14. Accession number:20131416174953 Title:Multi-index GA optimal control of greenhouse temperature based on CFD model Authors:Li, Yongbo1 ; Sun, Guoxiang1 ; Lou, Enping1, 2 ; Wang, Xiaochan3 ; Ding, Weimin3 Author affiliation:1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, China 2 College of Mathematics and Physics, Zhejiang Normal University, Jinhua 321004, China 3 Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province, Nanjing Agricultural University, Nanjing 210031, China Corresponding author:Li, Y. (bewit@njau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:186-191 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Closed-loop control system of greenhouse temperature was established for multi-index optimization by CFD modeling. In the system, multi-index including average temperature, temperature distributed and control cost, and control scene was natural ventilation. In order to minimize these indexes under the control mode, the GA optimization algorithm was adopted to obtain the optimal control outputs (entrances and skylights amplitudes). Simulation experiment shows that the technique of CFD for model can hold whole greenhouse environment into one system to improve control accuracy, and the control objective by CFD model is a "field", not a "point" as tradition. Meanwhile, using GA algorithm can get the optimal control inputs in multi-index system for reducing regional difference and energy consumption synchronous, so this design technique can richen the technology in greenhouse control system. Number of references:23 Main heading:Genetic algorithms Controlled terms: Computational fluid dynamics - Computer simulation - Control systems - Energy utilization - Gallium - Greenhouses - Temperature - Ventilation Uncontrolled terms:Control objectives - Greenhouse controls - Greenhouse environment - Greenhouse temperature - Multi-index - Natural ventilation - Optimal controls - Regional differences Classification code:921 Mathematics - 731.1 Control Systems - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 643.5 Ventilation - 641.1 Thermodynamics - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 525.3 Energy Utilization - 402.1 Industrial and Agricultural Buildings DOI:10.6041/j.issn.1000-1298.2013.03.034 Database:Compendex 15.Accession number:20131416174929 Title:Model predictive control of energy efficiency of an intake pump station Authors:Tang, Yuling1, 2 ; Zhang, Shirong1 Author affiliation:1 School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China 2 College of Computer Science, South-Central University for Nationalities, Wuhan 430074, China Corresponding author:Zhang, S. (srzhang@whu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:50-54 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The energy model of an intake pump station was firstly introduced. Then, an open loop optimal control approach and a model predictive control (MPC) approach were introduced to improve the operational efficiency of intake pump stations. They lump time-of-use (TOU) tariff and intake level into their objective functions, and take total water consumption and the low and high limit of the clean water reservoir as constraints as well. An intake pump station, equipped with three constant speed pumps, was taken as a case study. The conventional optimal control and the MPC approach were investigated, respectively. The advantage of the MPC approach was convinced by the simulation results. Further, the load shifting of intake pump stations was also achieved through the proposed control approaches. Number of references:16 Main heading:Predictive control systems Controlled terms: Control - Energy efficiency - Model predictive control - Pumps - Water supply Uncontrolled terms:Constant speed pumps - Load shifting - Model predictive - Objective functions - Open loop optimal control - Operational efficiencies - Pump station - Water consumption Classification code:446.1 Water Supply Systems - 525.2 Energy Conservation - 618.2 Pumps - 731 Automatic Control Principles and Applications - 731.1 Control Systems - 732 Control Devices DOI:10.6041/j.issn.1000-1298.2013.03.010 Database:Compendex 16.Accession number:20131416174957 Title:Growth modelling and visualization simulation of lily bulblet Authors:Ge, Zhenyang1 ; Jiang, Limin1 ; Yu, Yingjie1 ; Li, Peng1 ; Yi, Huaifeng1 ; Li, Licheng1 Author affiliation:1 Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China Corresponding author:Ge, Z. (ge.27@kmust.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:209-214 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Growth mechanism and visualization model of lily scale was developed. According to growth mechanism of scales whirling and packing, the system of bulblet growth and visualization was constituted. The scales' growth was regarded as linear growth trend, when growing a little elements, the scale deflected a certain angle to center-stem. Scales' visualization model was developed by employing quadrilateral picture element drawing double-semi-elliptical truncated cone. The section drawing of scale was crescent, which was composed of two semi-ellipses of identical semi-major axis and unequal semi-minor axis. The result shows that this system can simulate livingly lily bulblet vegetation process of whirling and packing. Number of references:17 Main heading:Visualization Controlled terms: Flow visualization - Rotation Uncontrolled terms:Growth mechanisms - Growth modelling - Lily bulblet - Scale - Semimajor axis - Truncated cone - Visualization models - Visualization simulations Classification code:601.1 Mechanical Devices - 631.1 Fluid Flow, General - 902.1 Engineering Graphics DOI:10.6041/j.issn.1000-1298.2013.03.038 Database:Compendex 17. Accession number:20131416174942 Title:Biodegradable polyurethane foam with liquefied product from corn stover Authors:Xiao, Weihua1 ; Li, Zhenning1 ; Niu, Wenjuan1 ; Han, Lujia1 Author affiliation:1 College of Engineering, China Agricultural University, Beijing 100083, China Corresponding author:Han, L. (hanlj@cau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:124-128 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With the aim to explore the efficient application of microwave liquefied product, experiment on the synthesis of polyurethane (PU) with microwave liquefied product from corn stover instead of petrochemical polyol was carried out. The optimized synthetic process of PU was 0.30 g foam blowing agent and isocyanate index 1.0. The biodegradable property of the composites was investigated by means of bury test which showed 18.71% degradation rate in six months. The thermal gravimetric analysis indicated four phases in the thermal pyrolysis of PU. All the results indicated microwave liquefied product from corn stover could be used for the production of PU foam while the material property was to be characterized and improved. Number of references:14 Main heading:Microwaves Controlled terms: Biodegradability - Biodegradation - Blowing agents - Degradation - Liquefaction - Polyurethanes - Thermogravimetric analysis Uncontrolled terms:Biodegradable polyurethanes - Corn stover - Foam blowing agent - Isocyanate indices - Material property - Petrochemical polyol - Thermal gravimetric analysis - Thermal pyrolysis Classification code:803 Chemical Agents and Basic Industrial Chemicals - 802.3 Chemical Operations - 802.2 Chemical Reactions - 815.1.1 Organic Polymers - 801.2 Biochemistry - 711 Electromagnetic Waves - 454 Environmental Engineering - 801 Chemistry DOI:10.6041/j.issn.1000-1298.2013.03.023 Database:Compendex 18. Accession number:20131416174926 Title:Multidisciplinary collaborative design optimization of diesel engine motion mechanism Authors:Li, Lei1, 2 ; Zhang, Jianrun1 ; Chen, Lin2 Author affiliation:1 School of Mechanical Engineering, Southeast University, Nanjing 211189, China 2 College of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China Corresponding author:Zhang, J. (zhangjr@seu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:33-37 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Multidisciplinary coupling rapid design and optimization of mechanical structure was researched, and multidisciplinary design optimization of diesel engine motion mechanism was proposed. The comprehensive performance of lightweight, thermal, vibration and kinematic were considered in optimizing the diesel engine motion mechanism. Aimed of lightweight, 3-D parametric model of crankshaft-connecting rod-piston were founded, and the performances of lightweight, vibration, thermal and kinematic was set as constraint. Based the theory of collaborative optimization, multidisciplinary design optimization of the diesel engine motion mechanism performed good results. Number of references:10 Main heading:Distributed computer systems Controlled terms: Crankshafts - Design aids - Diesel engines - Kinematics - Structural optimization Uncontrolled terms:Collaborative optimization - Comprehensive performance - Mechanical structures - Motion mechanisms - Multi-disciplinary collaborative designs - Multi-disciplinary optimizations - Multidisciplinary coupling - Multidisciplinary design optimization Classification code:601.2 Machine Components - 612.2 Diesel Engines - 722.4 Digital Computers and Systems - 902.1 Engineering Graphics - 921.5 Optimization Techniques - 931.1 Mechanics DOI:10.6041/j.issn.1000-1298.2013.03.007 Database:Compendex 19.Accession number:20131416174948 Title:Design and performance test of low-temperature pasteurization equipment for experiment Authors:Liu, Wenying1 ; Wang, Fei1 ; Guo, Lihua1 ; Huang, Liyan1 ; Zhao, Weigao1 ; Lu, Xiaoming1 Author affiliation:1 Beijing DQY Agriculture Technology Co., Ltd., Beijing 100081, China Corresponding author:Lu, X. (luxiaoming@dqy.com.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:158-160 185 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to promote the application of low-temperature pasteurization in the heat thermosensitive materials, the equipment was designed. The design principle, its structural characteristics and processes were proposed, and the thermal power, heat transfer and flow resistance were analyzed. The maximum processing capacity was 13800 mL/h with 230 mL/min of maximum flow velocity. Taking water as treatment material, the temperature of water can reach to 52°C from 4°C in 4.5 s, and reduce to 20°C from 52°C in 3 s or 10°C in 6 s. And the bacterium concentration of liquid egg white could lessen to 100 CFU/mL in 2.5 min at 55°C. The performance test shows that the system possesses a good heat-transfer capability, and a high sterilizing effect. Results provide the technical basis for the design and manufacture of low-temperature pasteurization equipment. Number of references:10 Main heading:Heating equipment Controlled terms: Heat transfer - Pasteurization - Temperature - Water treatment Uncontrolled terms:Design and manufactures - Heat transfer and flows - Low temperatures - Maximum flow velocities - Performance tests - Processing capacities - Structural characteristics - Thermo-sensitive materials Classification code:445.1 Water Treatment Techniques - 641.1 Thermodynamics - 641.2 Heat Transfer - 642.2 Industrial Furnaces and Components - 822.2 Food Processing Operations DOI:10.6041/j.issn.1000-1298.2013.03.029 Database:Compendex 20. Accession number:20131416174934 Title:Fast measurement and advanced sensors of soil parameters with NIR spectroscopy Authors:Li, Minzan1 ; Zheng, Lihua1 ; An, Xiaofei1 ; Sun, Hong1 Author affiliation:1 Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China Corresponding author:Li, M. (pact@cau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:73-87 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Near infrared spectroscopy (NIRS) is a powerful tool in the analysis of the soil compositions as well as soil physical and chemical properties. Artificial neural networks (ANN), genetic algorithm (GA), wavelet transform, support vector machine (SVM) and other modern data processing algorithms have made estimation and analysis of the soil parameters more accurate and stable since they can eliminate spectral error caused by outside interference and efficiently extract spectral information. It is still necessary to eliminate the impact of soil moisture and particle size on soil spectra in the in-site measurement. Development of the portable and vehicle-mounted real-time soil spectral analyzer is an important measure to promote the practice of precision agriculture. The developed vehicle-mounted soil on-line spectrophotometers have realized the analysis of several soil parameters, and reached a very high accuracy. It is a trend to develop multifunctional vehicle-mounted real-time soil spectral analyzer in the future by which the correction of the spectra can be performed with the data fusing of the spectral data and other dielectric or mechanical properties. The modern spectroscopies, photoacoustic spectroscopy (PAS), laser induced breakdown spectroscopy (LIBA), and terahertz (THz), have shown the great potential in the analysis of soil compositions and parameters. It is needed to carry out basic researches to reveal the spectroscopy characteristics of soil samples in different types and conditions. Number of references:96 Main heading:Soil surveys Controlled terms: Agriculture - Chemical properties - Data processing - Genetic algorithms - Mechanical properties - Near infrared spectroscopy - Neural networks - Parameter estimation - Particle size - Photoacoustic spectroscopy - Soil moisture - Soils - Spectrum analyzers - Support vector machines - Terahertz spectroscopy Uncontrolled terms:Analysis of soils - Data processing algorithms - Fast measurement - NIR spectroscopy - Precision Agriculture - Soil sensors - Spectral analyzers - Spectral information Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943.2 Mechanical Variables Measurements - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 931.2 Physical Properties of Gases, Liquids and Solids - 931.1 Mechanics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 801 Chemistry - 731.1 Control Systems - 723 Computer Software, Data Handling and Applications - 483.1 Soils and Soil Mechanics - 423 Non Mechanical Properties and Tests of Building Materials DOI:10.6041/j.issn.1000-1298.2013.03.015 Database:Compendex 21. Accession number:20131416174951 Title:Optimization of extraction technology of rice bran polysaccharide by extrusion in conjunction with ultrasound Authors:Li, Jie1 ; Luo, Zhigang2 ; Xiao, Zhigang1 ; Wang, Limin1 ; Zhu, Xiuqing1 ; Sun, Shukun1 Author affiliation:1 College of Food Science, Northeast Agricultural University, Harbin 150030, China 2 School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510006, China Corresponding author:Xiao, Z. (zhigangx@sina.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:174-179 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With the aim to improve the yield of rice bran polysaccharide, the method of extrusion in conjunction with ultrasound was used. On the basis of single factor experimental results, the combination design of quadratic orthogonal rotation was adopted to analyze the conditions of extrusion process and ultrasonic treatment condition, and then the mathematical model of ultrasonic treatment was constructed. The test results show that the rice bran is acquired under the condition of moisture content 20%, extrusion temperature 115°C and screw speed 120 r/min, the yield of rice bran polysaccharide can reach to 7.18% under the optimized conditions of ultrasonic time 21 min, ultrasonic power 117 W, ultrasonic temperature 72°C and liquid-solid ratio 8.7 mL/g. Number of references:17 Main heading:Extrusion Controlled terms: Mathematical models - Optimization - Ultrasonic equipment - Ultrasonics Uncontrolled terms:Combination design - Extraction technology - Extrusion temperatures - Optimized conditions - Quadratic orthogonal rotation - Rice brans - Technology optimization - Ultrasonic treatments Classification code:535.2.2 Metal Forming Practice - 753.1 Ultrasonic Waves - 753.2 Ultrasonic Devices - 921 Mathematics - 921.5 Optimization Techniques DOI:10.6041/j.issn.1000-1298.2013.03.032 Database:Compendex 22. Accession number:20131416174921 Title:Numerical simulation of nozzle flow in GDI multi-hole injector Authors:Ding, Hongyuan1 ; Liu, Fen1 ; Huang, Ronghua1 ; Wang, Zhaowen1 ; Li, Zhi1 Author affiliation:1 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China Corresponding author:Huang, R. (rhhuang@mail.hust.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:6-11 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The two-fluid method using linear cavitation model was utilized to simulate GDI multi-hole injector nozzle flow. The evolutionary law of the cavitation flow pattern was analyzed. Cavitation criterions were summarized and compared. Results showed that cavitation was formed at the hole corner and the gap between the moving needle and valve seat. Cavitation flow pattern was unstable and changed with time. Nozzle flow rate decreased and while exit velocity increased due to the cavitation. Also each hole flow rate was different. The critical cavitation number was efficient to predict the cavitation. The non-cavitation flow of GDI multi-hole injector could only be appeared when the injector worked in low injection pressure and high ambient pressure for stratified combustion applications. Number of references:10 Main heading:Cavitation Controlled terms: Computer simulation - Direct injection - Flow patterns - Flow rate - Gasoline - Jet pumps - Nozzles Uncontrolled terms:Cavitation flow - Cavitation model - Cavitation number - High ambient pressure - Low injection pressure - Multi-hole injectors - Stratified combustion - Two-fluid methods Classification code:521 Fuel Combustion and Flame Research - 523 Liquid Fuels - 618.2 Pumps - 631 Fluid Flow - 723.5 Computer Applications DOI:10.6041/j.issn.1000-1298.2013.03.002 Database:Compendex 23. Accession number:20131416174959 Title:Schemes evaluation of product design for energy optimization Authors:He, Ping1, 2 ; Liu, Guangfu1 ; Zhou, Dan1 ; Song, Shouxu1 ; Wu, Zhongwei1 Author affiliation:1 School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China 2 School of Mechanical and Electrical Engineering, Anhui University of Architecture, Hefei 230601, China Corresponding author:He, P. (peace1823@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:219-224 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Based on the evaluation analysis of the energy characteristics of products, an energy optimization performance assessment model was presented taking into account economical effectiveness, environmental performance and uncertainty of energy consumption factors of use phase. In accordance with using process of energy optimization, the economy analysis model and environment analysis model were established. Uncertainty factors influencing energy optimization were analyzed and modeled during the usage stage. Therefore the evaluation value of energy optimization performance was obtained. Then the product design scheme was evaluated by applying fuzzy information axiom method, and the optimal design scheme was acquired. At last, a product case was given to verify the assessment method. Number of references:14 Main heading:Uncertainty analysis Controlled terms: Energy utilization - Environmental management - Optimization - Product design Uncontrolled terms:Economical effectiveness - Energy characteristics - Energy optimization - Environment analysis - Environmental performance - Evaluation method - Fuzzy information axioms - Performance assessment models Classification code:454.1 Environmental Engineering, General - 525.3 Energy Utilization - 913.1 Production Engineering - 921.5 Optimization Techniques - 922.1 Probability Theory DOI:10.6041/j.issn.1000-1298.2013.03.040 Database:Compendex 24.Accession number:20131416174960 Title:Dynamic modeling and characteristic analysis of compliant mechanisms based on PR pseudo-rigid-body model Authors:Yu, Yueqing1 ; Xu, Qiping1 Author affiliation:1 College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China Corresponding author:Yu, Y. (yqyu@bjut.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:225-229 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Based on the pseudo-rigid-body model (PRBM), a PR pseudo-rigid-body dynamic model (PRBDM) subjected to a force at the end was developed considering the effects of transverse deformation and axial deformation of flexible elements in compliant mechanisms comprehensively. The dynamic equation of the PR PRBDM was derived by using the Lagrange equation. The changes of performances of the PR PRBDM were showed in the equation feature and dynamic responses. The numerical analysis results indicate that the PR PRBDM proposed can be used to show the real dynamic characteristic of compliant mechanisms by introducing a prismatic pair to simulate the axial movement of flexible elements in compliant mechanisms and was suitable for the dynamics analysis and design of compliant mechanisms. Number of references:16 Main heading:Compliant mechanisms Controlled terms: Deformation - Dynamic models - Dynamic response - Equations of motion - Mechanical engineering - Mechanisms Uncontrolled terms:Axial deformations - Characteristic analysis - Dynamic characteristics - Dynamic equations - Lagrange equation - Pseudo-rigid-body - Pseudo-rigid-body models - Transverse deformation Classification code:931.1 Mechanics - 921 Mathematics - 608 Mechanical Engineering, General - 601.3 Mechanisms - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties - 408.1 Structural Design, General DOI:10.6041/j.issn.1000-1298.2013.03.041 Database:Compendex 25. Accession number:20131416174935 Title:Near-infrared spectroscopy determination of soil available N and available K based on MC-UVE method Authors:Liu, Xuemei1, 2 ; Liu, Jianshe1 Author affiliation:1 College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China 2 School of Civil Engineering, East China Jiaotong University, Nanchang 330013, China Corresponding author:Liu, J. (liujianshe@dhu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:88-91 136 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Visible/near-infrared spectroscopy (Vis/NIRS) was investigated for determination of soil properties, namely, available nitrogen (N) and available potassium (K). In order to improve the predictive precision and eliminate the influence of uninformative variables for model robustness, Monte Carlo uninformative variables elimination (MC-UVE) methods were proposed for variable selection in available N and available K NIR spectral modeling. Partial least squares (PLS) models analysis was implemented for calibration models. The modeling variable number was reduced to 210 from 751 for available N calibration model and 150 for available K calibration model. The performance of the model was evaluated by the correlation coefficient (R), RMSEP. The optimal MC-UVE PLS models were achieved, and R, RMSEP were 0.84, 17.1 mg/kg for N and 0.76, 15.4 mg/kg for K, respectively. Number of references:17 Main heading:Monte Carlo methods Controlled terms: Calibration - Infrared spectroscopy - Soils Uncontrolled terms:Available nitrogen - Available potassiums - Correlation coefficient - MONTE CARLO - Partial least squares models - Predictive precision - Variable selection - Visible/near-infrared spectroscopies Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941.4 Optical Variables Measurements - 941 Acoustical and Optical Measuring Instruments - 922.2 Mathematical Statistics - 483.1 Soils and Soil Mechanics DOI:10.6041/j.issn.1000-1298.2013.03.016 Database:Compendex 26. Accession number:20131416174927 Title:Pump operation optimization and projection pursuit evaluation strategy based on ant colony optimization Authors:Yuan, Yao1 ; Liu, Chao1 Author affiliation:1 School of Water Conservancy Science and Engineering, Yangzhou University, Yangzhou 225009, China Corresponding author:Liu, C. (liuchao@yzu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:38-44 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Usually the evaluation index of optimal pump operation solution is single. An optimal pump operation model which contained the constraint of start-stop pump unit was developed, and projection pursuit evaluation method for scheme optimization was proposed. The ant colony optimization algorithm was used to calculate the model. The heuristic information and the pheromone trail update method were improved by analyzing characters of the model for better performances. A calculation example for the No.4 Jiangdu pumping station was conducted. The results from ant colony optimization algorithm showed that 29.2% of energy fee could be saved under the designed operation condition, which was compared with the result from dynamic programming with successive approximation algorithm under the same discrete condition, and was better with 2.8% of the result from dynamic programming. The results from ant colony optimization algorithm had less times of the blade adjusting, and shorter operating time of the pumps. Projection pursuit evaluation could give consideration to multiple evaluation indexes. The evaluation result of projection pursuit not only has low electric fee, but also suitable for practical operation, which indicates that ant colony optimization algorithm combined with projection pursuit evaluation method can provide a high application value to the field of optimal operation of pumping stations and related fields. Number of references:15 Main heading:Pumps Controlled terms: Approximation algorithms - Dynamic programming - Heuristic methods - Optimization - Pumping plants Uncontrolled terms:Ant colony algorithms - Ant Colony Optimization algorithms - Evaluation strategies - High application value - Projection pursuits - Pump operation - Pumping stations - Successive approximations Classification code:446 Waterworks - 618.2 Pumps - 921 Mathematics - 921.5 Optimization Techniques DOI:10.6041/j.issn.1000-1298.2013.03.008 Database:Compendex 27. Accession number:20131416174943 Title:Simulation of bio-syngas production from biomass gasification via pressurized interconnected fluidized beds Authors:Feng, Fei1, 2 ; Song, Guohui1 ; Shen, Laihong1 ; Xiao, Jun1 ; Zhang, Lei2 Author affiliation:1 School of Energy and Environment, Southeast University, Nanjing 210096, China 2 Department of Mechanical Technology, Nanjing College of Chemical Technology, Nanjing 210048, China Corresponding author:Shen, L. (lhshen@seu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:129-136 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With Aspen Plus software, the simulation of the whole process of bio-syngas production from gasification via pressurized interconnected fluidized beds was carried out, and the model was validated by the comparison of simulation results and experimental results. The effects of gasification temperature (Tg), gasification pressure (pg) and steam to biomass ratio (S/B) on bio-syngas composition, H2/CO ratio, gasification proportion, bio-syngas yield, and carbon conversion were studied. The results showed that gasification temperature, gasification pressure and S/B had great influences on the biomass gasification process and the suitable gasification temperature and pressure was around 800°C and 0.4 MPa. Number of references:16 Main heading:Gasification Controlled terms: Biomass - Computer simulation - Computer software - Pressurization - Synthesis gas Uncontrolled terms:Aspen Plus software - Bio-syngas - Biomass Gasification - Carbon conversions - Gasification pressure - Gasification temperatures - Interconnected fluidized bed - Simulation Classification code:803 Chemical Agents and Basic Industrial Chemicals - 802.3 Chemical Operations - 723.5 Computer Applications - 804 Chemical Products Generally - 723 Computer Software, Data Handling and Applications - 525.1 Energy Resources and Renewable Energy Issues - 522 Gas Fuels - 614 Steam Power Plants DOI:10.6041/j.issn.1000-1298.2013.03.024 Database:Compendex 28. Accession number:20131416174938 Title:Effects of irrigation on soil temperature and soil freeze-thaw characteristics during seasonal freeze-thaw period Authors:Chen, Junfeng1 ; Zheng, Xiuqing1 ; Zang, Hongfei1 ; Liu, Ping1 ; Ren, Xia1 ; Sun, Ming2 Author affiliation:1 College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 Taigu Water Balance Experimental Field, Bureau of Hydrology and Water Resources Survey of Shanxi Province, Taigu 030800, China Corresponding author:Zheng, X. (zxq6818@sina.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:104-109 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:A series of field irrigation experiments of bare plot (BP), plastic film mulched plot (PFP) and corn straw mulched plot (CSP) were conducted during the seasonal freeze-thaw period. The effects of irrigation at different stages on soil temperature and soil freeze-thaw characteristics were analyzed. The results showed that the soil temperatures of plots irrigated earlier in freezing period were lower during the freeze-thaw period. The irrigation had a little effect on the soil temperature of BP and PFP in the thawing period, and the irrigation accelerated the thawing of the surface frozen layer. The soil temperatures of CSP irrigated at thawing period were lower and had a smaller variation. The mulching of corn straw went against soil thawing. The irrigation had a great effect on maximum soil freezing depth in the rapid increasing stage of accumulated negative soil temperature at the depth of 5 cm. Number of references:22 Main heading:Freezing Controlled terms: Irrigation - Soil mechanics - Temperature - Thawing Uncontrolled terms:Corn straws - Different stages - Freeze-thaw - Frozen layer - Soil freezing - Soil temperature - Soil thawing - Thawing period Classification code:483.1 Soils and Soil Mechanics - 641.1 Thermodynamics - 821.3 Agricultural Methods - 822.2 Food Processing Operations DOI:10.6041/j.issn.1000-1298.2013.03.019 Database:Compendex 29. Accession number:20131416174936 Title:Aftereffects of water-nitrogen interaction on rice at jointing stage Authors:Hao, Shurong1 ; Zheng, Ji1 ; Feng, Yuanzhou1 ; Huang, Congbo1 ; Ma, Danping1 Author affiliation:1 College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China Corresponding author:Hao, S. (srhao@hhu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:92-96 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to reveal the aftereffects of different nitrogen and water regulation levels on rice, pot experiments were carried out to study the aftereffects of short-term and long-term physiological indexes in different water-nitrogen interaction models at jointing stage. The results showed that optimal combination of water and nitrogen had compensation effect on physiological activity in a short-term after rewatering, while long-term aftereffect of delaying senescence was found at late growth stage. The single factor of water and nitrogen had significant influence on chlorophylls, fluorescence parameters, MDA, etc. in the short term after rewatering, and the collaborative interaction of water and nitrogen had reached to significant level in 15 d after rewatering. The interaction effect of water and nitrogen is different for different water stress level. The yields of heavy-drought treatments increased with the improvement of nitrogen supply, but were lower than other treatments. Accordingly, the heavy-drought should be avoided in rice jointing stage, and soil moisture content can't hold less than 70% soil water rate. The yields of sufficient irrigation and slight-drought treatments reduced with the increasing of nitrogen supply. Therefore, high level of water and fertilizer at jointing stage did not assure high yield. The treatment of rewatering combined with lower nitrogen supply after slight-drought can obtain the best effect on water saving and yield guarantee. Number of references:22 Main heading:Nitrogen Controlled terms: Drought - Physiological models - Physiology - Plants (botany) - Soil moisture - Water conservation Uncontrolled terms:Aftereffect - Collaborative interaction - Fluorescence parameters - Physiological activity - Physiological indices - Re-watering - Rice - Water-nitrogen interaction Classification code:444 Water Resources - 461.1 Biomedical Engineering - 461.9 Biology - 483.1 Soils and Soil Mechanics - 804 Chemical Products Generally DOI:10.6041/j.issn.1000-1298.2013.03.017 Database:Compendex 30. Accession number:20131416174922 Title:Spray break-up model establishment and experiment of multi-hole injector on gasoline direct injection engine Authors:Wang, Yanhua1, 2 ; Yang, Shichun2 ; Gao, Feng2 ; Su, Tiexiong1 ; Dong, Xiaorui1 Author affiliation:1 College of Mechatronic Engineering, North University of China, Taiyuan 030051, China 2 School of Transportation Science and Engineering, Beihang University, Beijing 100191, China Corresponding author:Yang, S. (yangshichun@buaa.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:12-16 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to establish spray break-up model of multi-hole injection on gasoline direct injection engine, Huh Gosman model was analyzed and evaluated. The primary break-up particle size distribution formula was built based on injection pressure. The spray break-up model was built for gasoline direct injection in cylinder. Finally, by establishing the capacity spray experiments, gasoline free spray experiments were carried out to verify the rationality of the model. It is found that estimating initial droplet size by experience formula to evaluate second break-up model, the spray penetration calculated with Huh Gosman model is smaller than experimental results. Through establishing primary break-up particle size distribution formula and modifying Huh Gosman model, the simulation results and the practical results are close to each other. At last, free spray under different injection pressure were simulated with above established models. Results matches well with the experimental results and the maximum average error is less than 5%. Number of references:11 Main heading:Gasoline Controlled terms: Computer simulation - Direct injection - Engines - Experiments - Jet pumps - Particle size analysis Uncontrolled terms:Average errors - Droplet sizes - Gasoline direct injection - Gasoline direct injection engines - Injection pressures - Multi holes - Multi-hole injectors - Spray penetration Classification code:951 Materials Science - 901.3 Engineering Research - 723.5 Computer Applications - 618.2 Pumps - 612 Engines - 523 Liquid Fuels - 521 Fuel Combustion and Flame Research DOI:10.6041/j.issn.1000-1298.2013.03.003 Database:Compendex 31. Accession number:20131416174949 Title:Effect of ultra high pressure on conformation and functional properties of S-ovalbumin Authors:Huang, Qun1, 2 ; Jin, Yongguo1 ; Ma, Meihu1 ; Zhang, Xiaowei1 ; Geng, Fang1 ; Sun, Shuguo1, 2 Author affiliation:1 College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China 2 Institute of Food Science, Jishou University, Jishou 416000, China Corresponding author:Ma, M. (mameihuhn@yahoo.com.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:161-166 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The effect of ultra high pressure (UHP) treatment on conformation of S-ovalbumin was studied with Raman spectra and fluorescence spectra analysis. The effect of UHP on some functional properties of S-ovalbumin, such as solubility, emulsibility and foamability, were also investigated. It was showed that no significant changed in the molecular weight distribution of S-ovalbumin after UHP. Along with the increase of pressure, the content of random coil of S-ovalbumin was increasing gradually, the stability decreasing owing to the conformation change of disulfide bonds, and tyrosine was buried in the side chain, accordingly the compactly plate sheet structure was to become loose. The fluorescence intensity showed a slight increase after UHP under 100 MPa, but then a sharp decline with the increase of pressure, no shift of the fluorescence emission peak happening, so it was pointed out that UHP induced conformational change. The solubility, emulsibility and foamability properties of S-ovalbumin had been improved significantly with the increase of pressure, and achieved the best effect at 300 MPa. Then, there was a drop down when the pressure was 500 MPa. Number of references:23 Main heading:Fluorescence Controlled terms: Amino acids - Covalent bonds - Emulsification - Molecular weight distribution - Raman scattering - Solubility Uncontrolled terms:Conformational change - Fluorescence emission peaks - Fluorescence intensities - Functional properties - Protein conformation - S-ovalbumin - Ultra high pressure (UHP) - Ultrahigh pressure Classification code:461 Bioengineering and Biology - 741.1 Light/Optics - 801 Chemistry - 801.4 Physical Chemistry - 802.3 Chemical Operations DOI:10.6041/j.issn.1000-1298.2013.03.030 Database:Compendex 32.Accession number:20131416174945 Title:GPS-based origin positioning and identification system for agricultural products Authors:Xie, Jing1 ; Sun, Chuanheng1 ; Zhou, Chao1 ; Li, Wenyong1 ; Wu, Xiaoming1 ; Yang, Xinting1 Author affiliation:1 Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China Corresponding author:Yang, X. (yangxt@nercita.org.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:142-146 152 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With the aim to ensure the integrity and objectivity of agricultural products traceability chain and provide agricultural information to consumers, a GPS-based origin positioning and identification system was designed for agricultural products, especially for the regional agricultural products and products labelled with protected destination of origin. The GPS model was integrated with electronic scales with the information of agricultural products. The practical application shows that the system can effectively verify the labeled information with GPS information to realize the origin positioning and identification for agricultural products. Number of references:18 Main heading:Global positioning system Controlled terms: Agricultural products - Electronic scales Uncontrolled terms:Agricultural informations Classification code:715 Electronic Equipment, General Purpose and Industrial - 716.3 Radio Systems and Equipment - 821.4 Agricultural Products DOI:10.6041/j.issn.1000-1298.2013.03.026 Database:Compendex 33. Accession number:20131416174930 Title:Flow field analysis of inlet sump in vertical circulation pump Authors:Ou, Mingxiong1 ; Shi, Weidong1 ; Tian, Fei1 ; Zhang, Desheng1 ; Lu, Xining1 Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China Corresponding author:Shi, W. (wdshi@ujs.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:55-58 63 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The design of inlet sump is an important part in whole project-design. With the aim to investigate the change of inlet chamber affected from impeller under different flows, an inlet sump model with and without impeller was analyzed with numerical simulation method. The results revealed that the fluid field of inlet sump without impeller almost had no change in different flows. The situation in the one with impeller was complicated. The inlet recirculation effect of impeller in part-load had a main influence on the outlet of inlet sump which grew with decreased flow. The distribution uniformity and velocity-weighted suction angle changed down with decreased flow rate. Tangent velocity appeared obviously in the outer of sump outlet at the flow rate of 0.4Q0. It had similar distribution with tangent velocity curve in the vortex and upstream developed in sump. All of these can provide an important reference for design and optimization of large vertical pump unit. Number of references:11 Main heading:Inlet flow Controlled terms: Computer simulation - Design - Flow control - Flow rate - Impellers - Pumps Uncontrolled terms:Design and optimization - Distribution uniformity - Inlet sump - Numerical simulation method - Suction angle - Uniformity - Vertical circulation - Vertical pumps Classification code:408 Structural Design - 601.2 Machine Components - 618.2 Pumps - 631 Fluid Flow - 631.1 Fluid Flow, General - 723.5 Computer Applications DOI:10.6041/j.issn.1000-1298.2013.03.011 Database:Compendex 34. Accession number:20131416174933 Title:Research on different specific speed pumps used as turbines Authors:Yang, Sunsheng1 ; Li, Qiang2 ; Huang, Zhipan1 ; Kong, Fanyu1 ; Shi, Haixia2 Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China 2 Institute of Chemical Machinery Engineering, Hefei University of Technology, Hefei 230009, China Corresponding author:Kong, F. (kongm@ujs.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:69-72 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:With the aim to investigate the difference of different specific speed pumps used as turbines, numerical simulation of different specific speed pump was performed. The efficiency between its two modes and the variations of flow rate and pressure head conversion factors of pump as turbine (PAT) with different specific speed pumps were analyzed. Meanwhile, the power loss distribution within different specific speed PATs were presented. Results showed that the flow rate and pressure head were increased when a pump was operated as a turbine. The efficiency of PAT was no more than its pump mode. The flow rate and head conversion factors decreased with the increase of specific speed. Power loss distribution within each hydraulic part showed that it was the power loss within impeller that took up the majority of the total power loss and this tendency grew with the growth of specific speed. Therefore, the optimization design of PAT should focus on impeller research. Number of references:12 Main heading:Pumps Controlled terms: Centrifugal pumps - Flow rate - Hydraulic motors - Impellers - Numerical analysis - Speed - Turbines Uncontrolled terms:Conversion factor - Hydraulic parts - Optimization design - Power loss distributions - Power-losses - Pressure heads - Pump as turbine (PAT) - Specific speed Classification code:931.1 Mechanics - 921.6 Numerical Methods - 632.2 Hydraulic Equipment and Machinery - 631 Fluid Flow - 618.2 Pumps - 612.3 Gas Turbines and Engines - 601.2 Machine Components DOI:10.6041/j.issn.1000-1298.2013.03.014 Database:Compendex 35.Accession number:20131416174955 Title:Multi-source images registration for harvesting robot to recognize fruits Authors:Feng, Juan1, 2 ; Liu, Gang1 ; Wang, Shengwei1 ; Ma, Xiaodan1 ; Zhou, Wei1 Author affiliation:1 Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China 2 College of Information Science and Technology, Agricultural University of Hebei, Baoding 071001, China Corresponding author:Liu, G. (pac@cau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:197-203 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to improve the accuracy rates and lower the impact on fruit recognition in unstructured environment, a combination of PMD camera and color camera was used to capture multi-source images of orchard scenes, SURF algorithm was used for extracting scale invariant features, Euclidean distance was regarded as a measure for judging the similarity of features, the ratio of distance from the closest neighbor to the distance of the second closest was utilized for initially matching feature vectors, BBF algorithm was devoted to speed up the closest neighbor's query, a kind of iterative method between picking out outlier points and optimization of model was applied to purify results, the performance of image registration was evaluated according to the MSE, NMI and COEF. The different experimental results show that the amount of information locking to object are enriched by the combination of cameras, the hybrid algorithm is real-time, robust and has ideal precision, which meets the need of orchard test. Number of references:25 Main heading:Algorithms Controlled terms: Cameras - Color matching - Fruits - Image registration - Orchards Uncontrolled terms:Amount of information - Euclidean distance - Fruit recognition - Harvesting robot - Hybrid algorithms - Multi-source images - Scale invariant features - Unstructured environments Classification code:821.4 Agricultural Products - 821.3 Agricultural Methods - 803 Chemical Agents and Basic Industrial Chemicals - 921 Mathematics - 801 Chemistry - 723.2 Data Processing and Image Processing - 723 Computer Software, Data Handling and Applications - 742.2 Photographic Equipment DOI:10.6041/j.issn.1000-1298.2013.03.036 Database:Compendex 36.Accession number:20131416174952 Title:Self-adaptive calibration of acoustic waves in controlled greenhouse Authors:Zhu, Songming1 ; Cai, Weiming1, 2 ; Wang, Ning2 ; He, Huinong1 Author affiliation:1 Key Laboratory of Equipment and Informatization in Environment Controlled Agriculture, Ministry of Agriculture, Zhejiang University, Hangzhou 310058, China 2 Oklahoma State University, Stillwater, OK 74078, United States Corresponding author:He, H. (nnhe@mail.hz.zj.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:180-185 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Some kind of audible sound can help plants or animals to grow healthily and faster. However, the acoustic waves was hard to be produced accurately as they would be absorbed or reflected back and forth in controlled environments such as greenhouse, plant factory, or aquaculture factory. A solution for improving audible sound output based on a closed-loop feed-forward control method was proposed. The output sound can be corrected by updating the transfer function of sound generation system. Proof tests were conducted in an artificial climate cabinet with 1.2 m×0.53 m×0.9 m. The results showed that pure tones, combination sound of pure tones, and normal music can be produced with over 98% output accuracy. Number of references:13 Main heading:Bioacoustics Controlled terms: Acoustic waves - Acoustics - Greenhouses Uncontrolled terms:Artificial climate - Closed-loop control - Controlled environment - Output accuracy - Plant factory - Protected agricultures - Self-adaptive - Sound generation Classification code:402.1 Industrial and Agricultural Buildings - 751 Acoustics, Noise. Sound - 751.1 Acoustic Waves - 931 Classical Physics; Quantum Theory; Relativity DOI:10.6041/j.issn.1000-1298.2013.03.033 Database:Compendex 37. Accession number:20131416174962 Title:Thorough solution of the minimum size of disc cam mechanism with oscillating follower Authors:Chang, Yong1, 2 ; Yang, Fufu3 ; Li, Yanping1 Author affiliation:1 School of Mechanical Engineering, Jimei University, Xiamen 361021, China 2 Engineering Training Center, Jimei University, Xiamen 361021, China 3 Xiamen Bely Communication Equipment Co., Ltd., Xiamen 361015, China Corresponding author:Li, Y. (ypli@jmu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:237-245 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The synthesis of mechanism the disc cam mechanism with oscillating follower has not been completed satisfactorily. The synthesis was solved completely by introducing a concept of auxiliary parallel line family based on the principle of analogous velocity chart. The left and right end points of intersection of the auxiliary parallel lines and the lines which limited the axis position of cam were solved. Through this method, the boundary points and lines of the axis position of cam were achieved in theory. Then the accurate analytical solution and the numerical discretization method for solving the points and lines were presented. According to this method, the minimum sizes of the base circle radius and the length of pendulum can be derived directly and the allowable selected area of the axis position of cam can be presented. The synthesis of the disc cam mechanism with oscillating follower is completed satisfactorily. The mechanism design example shows that this method is corrected and effective. Number of references:25 Main heading:Cams Controlled terms: Discrete event simulation - Machine design Uncontrolled terms:Analogous velocity chart - Disc cam - Equidistance/discretization - Oscillating follower - Parallel line Classification code:601 Mechanical Design - 601.3 Mechanisms - 723.5 Computer Applications DOI:10.6041/j.issn.1000-1298.2013.03.043 Database:Compendex 38. Accession number:20131416174944 Title:Influence of sodium cation on characteristics of CO2 gasification of lignin from reed kraft black liquor Authors:Yang, Qing1 ; Yin, Xiuli1 ; Wu, Chuangzhi1 ; Wu, Shubin2 ; Guo, Daliang2 Author affiliation:1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China 2 State Key Lab. of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China Corresponding author:Yin, X. (xlyin@ms.giec.ac.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:137-141 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The water-insoluble lignin (WIL), water-soluble lignin (WSL) and kraft black liquor (KBL) were performed on a thermogravimetry coupled with Fourier transform infrared spectrometry (TG-FTIR) to study the impact of sodium cation on lignin CO2 gasification, respectively. The TG profiles of the WSL and KBL were analogical during the whole reaction owing to the presence of sodium cation. The WIL and WSL had similar chemical structure, but there were different reactivity of CO2 gasification. Sodium cation on lignin structure had a control effect on the formation of CO in the CO2 gasification of WSL. Number of references:16 Main heading:Carbon dioxide Controlled terms: Fourier transform infrared spectroscopy - Gasification - Kraft process - Lignin - Positive ions - Thermogravimetric analysis Uncontrolled terms:Fourier transform infrared spectrometry - Kraft black liquor - Lignin structure - Sodium cations - TG-FT-IR Classification code:801 Chemistry - 802.3 Chemical Operations - 804.2 Inorganic Compounds - 811.1.1 Papermaking Processes - 811.3 Cellulose, Lignin and Derivatives DOI:10.6041/j.issn.1000-1298.2013.03.025 Database:Compendex 39. Accession number:20131416174932 Title:Pressure fluctuation of interior flow in mixed-flow pump Authors:Jin, Shuanbao1 ; Wang, Yongsheng1 ; Chang, Shuping1 ; Su, Yongsheng1 Author affiliation:1 College of Power Engineering, Naval University of Engineering, Wuhan 430033, China Corresponding author:Wang, Y. (yongshengwang666@126.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:64-68 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:The unsteady flow in a mixed-flow pump was simulated based on RANS solver embedded with SST turbulence model and SIMPLEC algorithm. The time-domain and frequency-domain of pressure fluctuations at four representative monitoring surfaces under different flow rate and rotational speed conditions were analyzed. Comparison between averaged calculated power and test data verified that interior flow simulated by this numerical model was relatively accurate. The numerical results showed that the maximum pressure fluctuation appeared at impeller inlet where the pressure fluctuation amplitude increased from hub to shroud. The dominant frequency at impeller inlet and impeller outlet was the impeller blade passing frequency, but the dominant frequency at middle and outlet of the stator was correlative with the flow rate. The pressure fluctuation became stronger as deviating from the optimum flow rate, especially at impeller inlet when small flow rate conditions. The optimum flow rate conditions of different rotational speed had a similar dominant frequency of pressure fluctuation, the pressure fluctuation amplitude increased with the rotational speed increasing. Number of references:10 Main heading:Impellers Controlled terms: Computer simulation - Flow rate - Unsteady flow Uncontrolled terms:Dominant frequency - Frequency domains - Mixed flow pump - Numerical results - Pressure fluctuation - Rotational speed - SIMPLEC algorithm - SST turbulence models Classification code:601.2 Machine Components - 631 Fluid Flow - 631.1 Fluid Flow, General - 723.5 Computer Applications DOI:10.6041/j.issn.1000-1298.2013.03.013 Database:Compendex 40. Accession number:20131416174963 Title:Establishment of autoregressive distributed lag model in thermal error compensation of CNC machine tools Authors:Yao, Huanxin1 ; Niu, Pengcheng2 ; Gong, Yayun2 ; Shao, Shanmin2 ; Miao, Enming2 Author affiliation:1 School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315211, China 2 School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei 230009, China Corresponding author:Yao, H. (hljmdjyhx@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:246-250 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Due to the problems of temperature-sensitive point selection and model establishment in the modeling of CNC machine tools thermal error compensation, the method was presented by combined with fuzzy clustering and grey correlation to select temperature-sensitive points and the autoregressive distributed lag was used to establish model. According to the experimental data of machine temperature and thermal error, multiple regression model and autoregressive distributed lag model were built respectively. The modeling test of thermal error was designed on the Leaderway V-450 CNC machining center, the thermal error and temperature data were measured on the conditions of the spindle speed in 2000, 4000 and 6000 r/min. The result showed that fitting accuracy of distributed lag mode was better than that of multiple regression model, robustness of distributed lag mode was lower than that of multiple regression model when experimental data of any spindle speed was used to modeling, but the robustness of distributed lag mode was prior to multiple regression model when experimental data of any two spindle speeds were used to modeling. Application of autoregressive distributed lag model for CNC machine tools thermal error prediction can be useful. Number of references:13 Main heading:Clustering algorithms Controlled terms: Computer control systems - Machine tools - Regression analysis - Robustness (control systems) Uncontrolled terms:Autoregressive distributed lag models - CNC machine tools - CNC machining centers - Experimental datum - Multiple regression model - Temperature-Sensitive - Thermal error - Thermal error compensation Classification code:603.1 Machine Tools, General - 721 Computer Circuits and Logic Elements - 731.1 Control Systems - 922.2 Mathematical Statistics DOI:10.6041/j.issn.1000-1298.2013.03.044 Database:Compendex 41. Accession number:20131416174958 Title:Linear laser detecting method of white foreign fibers in cotton based on sample cross-section imaging Authors:Liu, Feng1 ; Su, Zhenwei1 ; Qiao, Li1 Author affiliation:1 School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China Corresponding author:Su, Z. (zhenweisu99@hotmail.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:215-218 256 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Machine vision inspection of white foreign fibers in cotton is a research hotspot in China and aboard. Based on the fact that there are flosses and free filaments on the surface of a cotton layer, and most of the white foreign fiber surfaces are smooth, without any floss, an image acquisition method of the cross-section of the samples under the illumination of linear laser was proposed, which showed the differences of the microstructure characteristic of their surface from the reflection and transmission of the linear laser. Then, according to the features of the distribution and density of the flosses around the white spots in the images, an algorithm for identification of cotton and white foreign fibers was suggested. The experimental results indicated that, by the new method, the detecting rate of the white foreign fibers in cotton was up to 86.9%. Number of references:14 Main heading:Fibers Controlled terms: Computer vision - Cotton Uncontrolled terms:Detecting methods - Foreign fiber - Linear lasers - Machine vision inspection - Microstructure characteristics - Reflection and transmission - Surface from - White spots Classification code:723.5 Computer Applications - 812 Ceramics, Refractories and Glass - 817 Plastics and Other Polymers: Products and Applications - 819.1 Natural Fibers DOI:10.6041/j.issn.1000-1298.2013.03.039 Database:Compendex 42.Accession number:20131416174954 Title:Acquisition and analysis of sows' behavior before farrowing based on acceleration sensor Authors:Liu, Longshen1 ; Shen, Mingxia1 ; Yao, Wen2 ; Lu, Mingzhou1 ; Yang, Xiaojing3 ; Bo, Guangyu1 Author affiliation:1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, China 2 College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China 3 Key Lab. of Animal Physiology and Biochemistry, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China Corresponding author:Shen, M. (mingxia@njau.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:192-196 191 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:According to the existing problem of breeder continuous observing sows' behavior for sow farrowing judgment, working hard, piglet death due to negligence, monitoring system of sows' behavior before farrowing based on three axis acceleration sensor and WSN was designed. Sows' activities information was collected by using wireless acceleration sensor node. According to different acceleration curve volatility, behavior type was classified by K-means clustering algorithm, displayed real time and wireless transferred by 3G. The experiments showed that the system could acquire and transfer sows' activities information in no time, and the typical behaviors consist of lying, standing, eating and nesting were detected correctly. The accuracy was 87.93%. The system worked stably. Number of references:12 Main heading:Acceleration Controlled terms: Clustering algorithms - Sensor nodes - Sensors Uncontrolled terms:Acceleration curve - Acceleration sensors - Existing problems - K-Means clustering algorithm - Monitoring system - Sows' behavior - Three-axis acceleration sensor - WSN Classification code:721 Computer Circuits and Logic Elements - 722 Computer Systems and Equipment - 801 Chemistry - 931.1 Mechanics DOI:10.6041/j.issn.1000-1298.2013.03.035 Database:Compendex 43. Accession number:20131416174941 Title:Purification of CH4 from CH4/CO2 mixture by pressure swing adsorption Authors:Yang, Haiyan1, 2 ; Li, Wenzhe2 ; Zhang, Hongqiong2 Author affiliation:1 College of Science, Northeast Agricultural University, Harbin 150030, China 2 College of Engineering, Northeast Agricultural University, Harbin 150030, China Corresponding author:Li, W. (liwenzhe9@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:119-123 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Selective adsorption of CO2 from its mixture with CH4 on several commercial molecular sieves was studied at ambient temperature (25°C) and low pressure (0.2 MPa). The behaviours of the molecular sieves were compared by using three basic parameters: selectivity, adsorption capacity and regenerability. The results indicate 3A and 4A molecular sieves have low CO2 adsorption capacity. However 5A and 13X molecular sieves show high efficiency in dynamic separation of CH4 and CO2 when the adsorbents are used for the first time. The separation coefficient between CH4 and CO2 on 13X molecular sieve is higher than 5A, which proves 13X molecular sieve show better performance in separating CO2 from its mixture with CH4. But 5A and 13X molecular sieve could not be regenerated completely by vacuuming and the adsorption/regeneration performance became stable from their second use. The reason why separation performance of 5A and 13X molecular sieves decrease is explained by FTIR spectroscopy that the partial poisoning of the molecular sieves happened. That is to say the regenerability of the two molecular sieves need improve. Number of references:16 Main heading:Carbon dioxide Controlled terms: Adsorption - Biogas - Fourier transform infrared spectroscopy - Mixtures - Molecular sieves - Separation Uncontrolled terms:13X molecular sieve - Adsorption capacities - Dynamic separation - Pressure swing adsorption - Regeneration - Selective adsorption - Separation coefficients - Separation performance Classification code:522 Gas Fuels - 801 Chemistry - 802.3 Chemical Operations - 804.2 Inorganic Compounds DOI:10.6041/j.issn.1000-1298.2013.03.022 Database:Compendex 44. Accession number:20131416174946 Title:Automation evaluation of corn juices taste based on fuzzy information Authors:Liu, Jingjing1 ; Sun, Yonghai1 ; Chen, Li1 ; Sun, Zhonglei2 ; Wang, Xiaodan1 ; Fu, Tianyu1 Author affiliation:1 College of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China 2 College of Life Science and Technology, Yangtze Normal University, Chongqing 408100, China Corresponding author:Sun, Y. (sunyh@jlu.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:147-152 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:Fuzzy information of corn juices was automatically evaluated based on a sensor array. The concept of weights was introduced for different taste sensory evaluation aspects of corn juices. The conversion of the qualitative and quantitative information was achieved. At the same time, adjustment of a comprehensive cloud model was completed based on the difference of weight. According to the requirements of the different evaluation aspects of corn juices including sweetness, soursweet and flavor, sensor array were analyzed and combination of different sensor array signals were obtained. Fuzzy neural networks were built for prediction of corn juices taste fuzzy information. The information for different aspects collected from sensor array was input. The information from cloud model according to sensory evaluation was output. With training fuzzy neural network, fuzzy layer center value, the fuzzification layer node width values and fuzzy decision-making regulation parameters were obtained to determine the network structure. The forecast analysis showed that the system allowed good effect with 0.00243-0.09177 error rate in the process of automation evaluation of fuzzy information for corn juices. Number of references:12 Main heading:Fuzzy neural networks Controlled terms: Sensors Uncontrolled terms:Cloud models - Corn juices - Evaluation - Fuzzification layer - Fuzzy decision-making - Network structures - Quantitative information - Taste Classification code:723.4 Artificial Intelligence - 801 Chemistry DOI:10.6041/j.issn.1000-1298.2013.03.027 Database:Compendex 45. Accession number:20131416174965 Title:Improved model of tangential stiffness for joint interface using anisotropic fractal theory Authors:Tian, Hongliang1 ; Zhao, Chunhua1 ; Fang, Zifan1 ; Zhu, Dalin1 ; Li, Xiang2 ; Mao, Kuanmin3 Author affiliation:1 College of Mechanical and Material Engineering, China Three Gorges University, Yichang 443002, China 2 Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance, China Three Gorges University, Yichang 443002, China 3 School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China Corresponding author:Tian, H. (thl19732003@yahoo.com.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:257-266 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:An improved model of tangential contact stiffness for joint interface was put forward by using anisotropic fractal geometric theory. Numerical simulation was executed to visually attain the complex nonlinear relationships between joint interface tangential contact stiffness and normal load, tangential load, fractal dimension D, fractal roughness G, relating factor K and material property φ. The numerical simulation results indicate that the joint interface tangential contact stiffness increases with increasing normal load, relating factor K or material property φ, but decreases with increasing tangential load or fractal roughness. When fractal dimension is smaller, the joint interface tangential contact stiffness increases as fractal dimension increases. However, when fractal dimension becomes larger, the joint interface tangential contact stiffness decreases as fractal dimension increases. Number of references:21 Main heading:Interfaces (materials) Controlled terms: Anisotropy - Computer simulation - Fractal dimension Uncontrolled terms:Geometric theory - Joint interfaces - Material property - Non-linear relationships - Normal contacts - Tangential contact stiffness - Tangential load - Tangential stiffness Classification code:723.5 Computer Applications - 921 Mathematics - 931.2 Physical Properties of Gases, Liquids and Solids DOI:10.6041/j.issn.1000-1298.2013.03.046 Database:Compendex 46. Accession number:20131416174931 Title:Experiment of constant pressure control characteristics for centrifugal pump Authors:Tang, Yue1 ; Huang, Zhipan1 ; Tang, Lingdi1 ; Mei, Xingxin1 Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China Corresponding author:Tang, Y. (tomt@ujs.edu.cn) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:44 Issue:3 Issue date:March 2013 Publication year:2013 Pages:59-63 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:In order to investigate the constant pressure control characteristics of centrifugal pump, a testing system on constant pressure closed-loop control of centrifugal pump water-supply system, which was based on internal PID controller of frequency converter was set up by using the virtual instrument. An innovative form of the outlet of the pump system composed of three ball valves was remodeled. It could change working condition quantitatively and rapidly. The outlet could create similar step disturbance. A LabVIEW test program was compiled to do research on control characteristics of constant pressure centrifugal pump system. The set range of the given pressure of the constant pressure control system was concluded. Contrasting the control characteristics of the fixed parameter PID regulator under different working conditions, it is showed that the control characteristics of the fixed parameter PID regulator are not good under the working conditions that changes quickly and extensively. Analyzing the control characteristics of the fixed parameter PID regulator and the variable parameter PID regulator under the same working condition, it is discovered that the variable parameter PID regulator is more applicable for the constant pressure control system. Number of references:11 Main heading:Pressure control Controlled terms: Centrifugal pumps - Proportional control systems - Step response - Water supply Uncontrolled terms:Closed-loop control - Constant pressure controls - Constant pressures - Control characteristics - PID controllers - Step disturbances - Variable parameter PID - Virtual instrument Classification code:446.1 Water Supply Systems - 618.2 Pumps - 731.1 Control Systems - 731.3 Specific Variables Control DOI:10.6041/j.issn.1000-1298.2013.03.012 Database:Compendex
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