摘要
利用离散元软件模拟气吸式排种器内食葵种群运动,为提高仿真试验的准确度,需对仿真参数进行标定。为此,通过物理试验和仿真试验相结合的方法对仿真参数进行标定。标定时利用物理试验测量了食葵种子的本征参数(几何尺寸、含水率、密度、千粒质量、休止角、泊松比、剪切模量)和接触力学参数(碰撞恢复系数、静摩擦因数、动摩擦因数),选用响应面法标定种子接触力学参数,仿真试验参数取值参考物理试验结果。对试验结果进行方差分析,得出静摩擦因数的影响极显著。以实测食葵种子休止角24.33°为优化目标,获得最优参数组合种间碰撞恢复系数0.42、静摩擦因数0.34、动摩擦因数0.12。以优化后的接触力学参数进行休止角仿真试验,得到仿真试验休止角24.52°,与实测休止角24.33°的相对误差为0.78%。由此表明该食葵种子离散元模型和接触力学参数可用于气吸式排种器内种群运动仿真试验。
In order to improve the accuracy of the simulation experiment when discrete element software is used to simulate the movement of sunflower population in the air suction seed metering device,the simulation parameters need to be calibrated.In this paper,the simulation parameters are calibrated through the combination of physical test and simulation test.The intrinsic parameters(geometric size,moisture content,density,1000 grain weight,angle of repose,Poisson's ratio,shear modulus)and contact mechanics parameters(collision recovery coefficient,static friction coefficient,dynamic friction coefficient)of sunflower seeds were measured by physical experiments.The response surface method is used to calibrate the seed contact mechanical parameters,and the simulation test parameters refer to the physical test results.The analysis of variance of the test results shows that the influence of static friction coefficient is very significant.Taking the measured repose angle of sunflower seeds of 24.33°as the optimization objective,the optimal parameter combinations of interspecific collision recovery coefficient of 0.42,static friction coefficient of 0.34 and dynamic friction coefficient of 0.12 were obtained.The simulation test of repose angle is carried out with the optimized contact mechanics parameters,and the relative error between the simulation test repose angle of 24.52°and the measured repose angle of 24.33°is 0.78%.It shows that the discrete element model and contact mechanics parameters of sunflower seeds can be used in the simulation experiment of population movement in air suction seed metering device.
作者
李凤丽
陶彦辉
陈江辉
Li Fengli;Tao Yanhui;Chen Jianghui(College of Mechanical and Electrical Engineering,Xinjiang Institute of Engineering,Urumqi 830023,China)
出处
《农机化研究》
北大核心
2024年第9期209-215,共7页
Journal of Agricultural Mechanization Research
基金
新疆维吾尔自治区自然科学基金项目(2022D01B19)
新疆工程学院博士科研启动基金项目(2020xgy042302)
新疆工程学院科研育人项目(2019xgy182112)。
关键词
食葵
接触参数标定
离散元仿真
种群运动
edible sunflower
calibration of contact parameters
discrete element simulation
population movement
