小麦籽粒碰撞模型中恢复系数的测定

为了建立小麦颗粒在清选振动筛和播种器中的碰撞模型,该文基于运动学方程原理构建了小麦恢复系数测试装置,对小麦的弹性特性进行了测定。试验选择江浙皖地区推广使用的扬麦17号小麦品种,采用混合正交试验设计方法,研究了碰撞材料、板材厚度、下落高度和小麦含水率对小麦恢复系数的影响。结果表明影响小麦恢复系数的因素主次顺序为:碰撞材料、下落高度、材料厚度和小麦含水率。小麦恢复系数随着下落高度的增大而减小,随着材料厚度的增加而增大,小麦含水率对其恢复系数的影响很小。该文的研究结果可为联合收割机清选振动筛和精密播种机的数值模拟和产品设计提供依据。

Experimental study on measurement of restitution coefficient of wheat seeds in collision models

To establish collision models of wheat seeds that on cleaning screen or seeds sower, a wheat restitution coefficient test device was build based on principle of kinematics equation in the paper, which was used to test the elastic properties of wheat seeds. Yangmai No.17 which is widely cultivated in Jiangsu, Zhejiang, Anhui province was chosen in the test and the mixed orthogonal design was used to investigate the factors that influencing the restitution coefficient of wheat such as collision material, sheet thickness, drop height and moisture content of wheat. Results indicate that the primary and secondary order of factors affecting restitution coefficient of wheat are impact material, drop height, sheet thickness and moisture content of wheat. The restitution coefficient of wheat decreases with the falling height increasing, but increases with the sheet thickness increasing. Wheat moisture content has little influence on the restitution coefficient. The results can provide a reference for the simulation and product design of cleaning screen in combined harvesters and precision seeds sower machine.