鹿芳媛,马旭,谭穗妍,陈林涛,曾令超,安沛.水稻芽种离散元主要接触参数仿真标定与试验[J].农业机械学报,2018,49(2):93-99.
LU Fangyuan,MA Xu,TAN Suiyan,CHEN Lintao,ZENG Lingchao,AN Pei.Simulative Calibration and Experiment on Main Contact Parameters of Discrete Elements for Rice Bud Seeds[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(2):93-99.
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水稻芽种离散元主要接触参数仿真标定与试验   [下载全文]
Simulative Calibration and Experiment on Main Contact Parameters of Discrete Elements for Rice Bud Seeds   [Download Pdf][in English]
投稿时间:2017-06-27  
DOI:10.6041/j.issn.1000-1298.2018.02.012
中文关键词:  芽种  休止角  离散元法  接触参数  标定
基金项目:国家重点研发计划项目(2017YFD0700802)、国家自然科学基金项目(51675188)、广东省科技计划项目(2014B020207002)、现代农业产业技术体系建设专项资金项目(CARS-01-33)和广东省公益研究与能力建设项目(2014A020208112)
作者单位
鹿芳媛 华南农业大学 
马旭 华南农业大学 
谭穗妍 华南农业大学 
陈林涛 华南农业大学 
曾令超 华南农业大学 
安沛 华南农业大学 
中文摘要:水稻播种时芽种含水率高、种芽长度差异大,表现出与其他作物种子不同的物理特性。为减小仿真分析时芽种参数设置不准确而形成的模拟系统误差,本文基于水稻芽种摩擦角的试验与仿真测定,标定出不同含水率下的水稻芽种离散元主要接触参数。通过芽种的摩擦角(两种休止角及滑动摩擦角)离散元仿真试验,建立了芽种-不锈钢板静摩擦因数、芽种-芽种静摩擦因数、芽种-芽种滚动摩擦因数与3个摩擦角之间的三元回归方程。以芽种的3个摩擦角试验结果作为修正指标,对回归方程数值求解,得到当仿真结果与试验结果的拟合误差达到允许范围内的3个主要接触参数。将标定后的参数进行试验验证,分别对不同含水率下的芽种摩擦角的仿真测定与实测结果进行对比分析,相对误差均小于2.75%,表明水稻芽种离散元模型与实际颗粒物料体现出相同的摩擦特性,建立的回归模型满足不同含水率芽种参数的标定要求。对其他5个品种的水稻芽种摩擦角实测值与仿真结果进行对比分析,相对误差均在5.54%以内。该水稻芽种的离散元模型及接触参数可为水稻精密播种装置的动态仿真提供参考。
LU Fangyuan  MA Xu  TAN Suiyan  CHEN Lintao  ZENG Lingchao  AN Pei
South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University and South China Agricultural University
Key Words:bud seeds  repose angle  discrete element method  contact parameters  calibration
Abstract:Rice bud seeds exhibit different physical properties from other crop seeds as high moisture content and large length difference of rice buds. Therefore, it is essential to calibrate the main discrete elements contact parameters of rice bud seeds with different moisture contents, and reduce the simulation system error that caused by inaccurate parameters of rice bud seeds. Three main contact parameters were calibrated, including coefficient of static friction between bud seeds and stainless plate (X1), coefficient of static friction between bud seeds (X2) and coefficient of rolling friction between bud seeds (X3), through experimental determination combined with simulation test of rice bud seeds friction angle. Two dynamic repose angles α and β and slipping friction angle γ were formed with three devices, and measured with the software In Sight Explorer based on image processing technology. Then through discrete element simulation test of bud seeds frictions with EDEM, the ternary regression equation between the three coefficients X1, X2 and X3 and the three friction angles was established. The experimental results of the three frictions were the correction index, and the regression equation was numerically solved to obtain the three main content parameters. The verification test of the calibration parameters showed that the relative error between simulation and experiment results of the bud seeds friction angles with different moisture contents was less than 2.75%. So the discrete element model of rice bud seeds and the actual particle material reflected the same friction characteristics, and the regression model satisfied the calibration requirements for bud seeds parameters with different moisture contents. Furthermore, the relative error of the other variety rice bud seeds was less than 5.54%, which indicated that the calibrated discrete element model and contact parameters of the bud seeds can be applied to the dynamic simulation of the precision sowing device.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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