摘要
为提高离散元方法模拟玉米秸秆揉碎过程的准确性,试验测定玉米秸秆与揉碎机锤片、玉米秸秆与玉米秸秆的接触参数。以径向堆积角相对误差值为评价指标,应用正交方法标定玉米秸秆离散元仿真需要输入的接触参数。结果表明:玉米秸秆与揉碎机锤片碰撞恢复系数、静摩擦因数、滚动摩擦因数分别设置为0.663、0.226、0.119;玉米秸秆与玉米秸秆碰撞恢复系数、静摩擦因数、滚动摩擦因数分别设置为0.485、0.142、0.078,此参数组合为玉米秸秆离散元仿真接触参数的最优方案,仿真结果与试验结果的相对误差为8.127%。
To improve the accuracy of the discrete element method simulation of corn stalk, the contact parameters tests of corn stalk and the hammer of tearing choppers,corn straw and corn straw were conducted in this study. By using the average value of the radial stacking angle as evaluation index, the orthogonal method was used to calibrate the contact parameters of the corn stalk discrete element simulation input. The coefficient of restitution, coefficient of static friction and coefficient of rolling friction with corn straw and hammer were calibrated by discrete element simulation. The results of the optimal scheme were 0. 663,0. 226, and 0. 119, respectively. In addition, the coefficient of restitution, coefficient of static friction and coefficient of rolling friction with corn stalk and corn stalk were set to 0.485, 0. 142 and 0. 078, respectively. The mean error value of discrete element simulation using this parameter combination was 8. 127%.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2018年第4期120-127,共8页
Journal of China Agricultural University
基金
国家自然科学基金项目(51665047)
内蒙古自治区自然科学基金项目(2016BS0516)
关键词
揉碎机
玉米秸秆
离散元
参数标定
恢复系数
摩擦因数
rubbing machine
corn straw
Discrete Element Method
parameter calibration
coefficient of restitution
coefficient of friction
