基于EDEMpy的枸杞离散元仿真参数标定与试验  

Discrete Element Simulation Parameters Calibration and Experimentation of Lycium Barbarum Based on EDEMpy

作　　者：虎小雅 高垚垚 王昱潭[1] 曲爱丽[1] 李乾峰 魏迟 Hu Xiaoya;Gao Yaoyao;Wang Yutan;Qu Aili;Li Qianfeng;Wei Chi(School of Mechanical Engineering,Ningxia University,Yinchuan 750021,China;Shizuishan Vocational College of Industry and Trade,Shizuishan 753000,China;School of Technology,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]宁夏大学机械工程学院,银川750021 [2]石嘴山工贸职业技术学院,宁夏石嘴山753000 [3]北京林业大学工学院,北京100083

出　　处：《农机化研究》2024年第9期30-38,共9页Journal of Agricultural Mechanization Research

基　　金：宁夏回族自治区重点研发计划“揭榜挂帅”项目(2022-2024)。

摘　　要：为探究枸杞离散元仿真边界参数的最优组合,提高离散单元仿真方法研究枸杞与采收机械作用机理的准确性,提升后续枸杞机械采收设备的研发效率及机械作业性能,选取EDEM中“Hertz-Mindlin with Johnson-Kendall-Roberts”凝聚力接触模型,通过物理试验测量枸杞堆积角、枸杞-钢板静摩擦因数、枸杞-钢板碰撞恢复系数。在物理试验的基础上,采用基于EDEMpy的仿真试验方法对枸杞的接触参数进行试验研究,以枸杞颗粒的静摩擦因数、滚动摩擦因数、碰撞恢复系数、表面能JKR为影响因素,以堆积角为目标进行多因素试验,并建立回归模型。试验结果表明:对枸杞仿真堆积角影响显著的参数为枸杞-枸杞静摩擦因数、枸杞-枸杞滚动摩擦因数、表面能JKR。以实际堆积角为目标值,对回归模型进行优化分析,得到显著性参数最优组合值分别为:枸杞-枸杞静摩擦因数0.506,枸杞-枸杞滚动摩擦因数0.064,表面能JKR0.048,该组合下的仿真堆积角平均值为28.82°,与实际堆积角的偏差小于4%,边界参数标定结果可靠。研究结果可为枸杞离散元模型边界参数的选取提供参考。In order to explore the optimal combination of discrete element simulation boundary parameters of Lycium barbarum(L.B.),improve the accuracy of the discrete element simulation method to study the mechanism of action between L.B.and harvesting machinery,and enhance the research efficiency and mechanical performance of the subsequent mechanical harvesting equipment of L.B.,this study selected the EDEM Hertz-Mindlin with Johnson-Kendall-Roberts cohesive contact model,and measured the stacking angle,the static friction coefficient between L.B.and steel plate,and the collision recovery coefficient between L.B.and steel plate through physical tests.Based on the physical test,the contact parameters of L.B.were investigated using EDEMpy-based simulation test method,with the static friction coefficient,rolling friction coefficient,collision recovery coefficient,and surface energy JKR of L.B.particles as the influencing factors,and the stacking angle as the target for the multi-factor test,and the regression model was established.The test results show that the parameters that have a significant effect on the simulated stacking angle of L.B.are the coefficient of static friction between L.B.,the coefficient of rolling friction between L.B.and the surface energy JKR.Using the actual stacking angle as the target value,the regression model was optimized and the optimal combination of the significant parameters was obtained as follows:the coefficient of static friction between L.B.is 0.506,the coefficient of rolling friction between L.B.is 0.064,and the surface energy JKR is 0.048.The mean value of the simulated stacking angle under this combination is 28.82°,and the deviation from the actual stacking angle is less than 4%,and the calibration results of the boundary parameters are reliable.The study can provide a reference for the selection of the boundary parameters of the discrete element model of L.B..

关 键 词：枸杞 离散元 EDEMpy 凝聚力 参数标定 堆积角 

分 类 号：S663.9[农业科学—果树学] S233.74[农业科学—园艺学]