冬小麦种子颗粒离散元仿真参数标定  

Determination the intrinsic parameters and calibration of contact parameters for wheat seed particles

作　　者：马永超 王尊 石林榕 赵武云 孙步功 戴飞 李辉 MA Yongchao;WANG Zun;SHI Linrong;ZHAO Wuyun;SUN Bugong;DAI Fei;LI Hui(School of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学机电工程学院,兰州730070

出　　处：《中国农业大学学报》2025年第3期175-184,共10页Journal of China Agricultural University

基　　金：国家自然科学基金项目(52065004,52365030);兰州市青年人才创新项目(2023-QN-146);甘肃省教育厅高校科研创新平台重大培育项目(2024CXPT-15);甘肃省科技专员专项(23CXGA0066);2023年甘肃省农机研发制造推广应用一体化试点项目(3-3)。

摘　　要：甘肃省冬小麦相较其他品种小麦形态差异较大,针对其他品种小麦离散元仿真参数应用于甘肃省冬小麦播种机械设计与优化误差较大的问题,以‘甘农2号’种子为研究对象,采用物理试验测定种子本征参数及与PLA塑料、软胶和树脂间的静摩擦因数和碰撞恢复系数。基于离散元法(Discrete element method,DEM),利用EDEM软件结合斜面滚动试验,标定种子与PLA塑料、软胶和树脂间的滚动摩擦因数。采用圆筒提升法进行物理堆积试验,将试验所得堆积图像经MATLAB软件处理后得到种子物理堆积角,通过Design-Expert 8.06软件对多元二次方程进行多目标优化,获得种子颗粒间离散元模型接触参数较优组合,并利用EDEM软件进行验证。结果表明:小麦种子与PLA塑料、软胶和树脂的静摩擦因数分别为0.543、0.645和0.425;碰撞恢复系数分别为0.471、0.351和0.497;滚动摩擦因数分别为0.087、0.096和0.098。种子颗粒间静摩擦因数、碰撞恢复系数和滚动摩擦因数分别为0.43、0.50和0.07。物理堆积角为32.95°,仿真堆积角与物理堆积角相对误差为0.3%。本研究标定的冬小麦颗粒离散元仿真参数可为甘肃省小麦精量播种机械的设计优化提供参考。Winter wheat varieties in Gansu Province is morphologically more different to other wheat varieties.Given the problem that the discrete element simulation parameters of other varieties of wheat applied to the design and optimisation of winter wheat sowing machinery in Gansu Province caused larger errors,the wheat seeds of wheat variety,‘Gan Nong no 2’,were taken as the research object.The physical test was used to determine the intrinsic parameters of the seeds and the static friction factor and collision recovery coefficient between seeds and PLA plastics,and soft glues and resins.The physical test was used to determine the seed's intrinsic parameters and the static friction factor and collision recovery coefficient between the seed and PLA plastic,soft rubber and resin.The rolling friction factors between seeds and PLA plastic,soft rubber and resin were calibrated by combining EDEM software simulation test with an inclined rolling test.The physical stacking test was carried out by the cylinder lifting method,and the stacking images obtained from the test were processed by MATLAB software to obtain the physical stacking angle of the seeds.The multi-objective optimization of the multivariate quadratic equations was carried out by Design-Expert 8.06 software to obtain a better combination of the contact parameters of the discrete element model between the seed particles,and it was verified by EDEM software.The results showed that:The static friction factors of‘Gan Nong no 2’with PLA plastic,soft rubber and resin were 0.543,0.645 and 0.425,respectively;The coefficients of recovery of the collision were 0.471,0.351 and 0.497,respectively;And the rolling friction factors were 0.087,0.096 and 0.098,respectively.The inter particle static friction factor,collision recovery coefficient,and rolling friction factor were 0.43,0.50 and 0.07,respectively.The physical stacking angle was 32.95°,and the relative error between the stacking angle of the simulation test and the physical stacking angle was 0.3%.In conclusio

关 键 词：冬小麦种子颗粒 离散元法 接触参数 标定 播种机械 

分 类 号：S223.2[农业科学—农业机械化工程]