摘要
针对皮带输送机运输小麦过程缺乏离散元仿真参数的问题,对小麦与皮带间碰撞恢复系数、滚动摩擦系数、静摩擦系数等3个接触参数进行了试验标定。采用高速摄像机并基于运动学原理的方法进行了碰撞恢复系数测定试验,发现该系数随着小麦下落高度的增加逐渐减小,小麦不同部位碰撞得到的结果具有差异性。结合皮带机实际工况最终选取碰撞恢复系数为0.418 5;依靠EDEM仿真与实际试验对照的方法,利用斜面滚动和滑移试验,得到了小麦-皮带滚动摩擦系数、静摩擦系数分别为0.137 1、0.503 0。设计了响应面试验对3个接触参数(小麦间动摩擦系数、小麦间静摩擦系数、小麦-皮带静摩擦系数)进行验证,以实际堆积角为目标找到了最优参数组合,并将该组合进行了EDEM仿真试验,得到堆积角与实际测量值误差为1.10%,表明小麦与皮带间3个接触参数是可靠的。参数标定可为皮带机倾斜输送小麦、提高产量等离散元仿真研究提供参考。
In order to study the contact parameters between wheat and conveyor belt used in belt conveyor, a high-speed camera was used to capture collision process, and according to the motion geometry principle, the motion posture of wheat after the collision with the belt was described. Based on the high frame number of the camera, the actual initial rebound velocity of wheat was obtained, and then the coefficient of restitution of wheat-belt was acquired. By placing 100 wheat grains in a fixed position on the inclination belt, the actual average rolling distance of wheat was obtained with image processing. Different coefficient of rolling frictions were input into EDEM to obtain different average rolling distances in the simulation process, and compared with the actual situation to obtain the coefficient of rolling friction of the wheat and belt. A total of four sets of inclination angles(30°-60°) were set in the experiment. The coefficient of static friction was determined by the slip experiment of wheat and the same inverse reasoning method. The inclination angle of the belt when 30 grains with a uniform size slipped on the inclined belt in the actual situation was recorded. In the EDEM environment, the simulation experiment was carried out, and the inverse tangent function fitting was carried out in the Origin software. The actual inclination angle of the belt when the wheat slipped was substituted into the function and the actual maximum static friction coefficient of the wheat belt were obtained. The Box-Behnken experiment was designed to verify the reliability of contact parameters based on wheat stacking angle as the response value. The actual measured value of the stacking angle was set as the target, the optimal parameter combination was established and compared with the 0 horizontal combination. Through the above experiment, the results showed that the coefficient of restitution decreased gradually with the increase of the falling height in the range of 300-600 mm, and the results obtained at different colli
作者
孙延新
王明旭
张超
SUN Yanxin;WANG Mingxu;ZHANG Chao(College of Mechanical and Electric Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2021年第6期113-120,共8页
Journal of Henan University of Technology：Natural Science Edition
基金
河南省高等学校青年骨干教师培养计划(2020GGJS088)。
关键词
小麦
橡胶皮带
参数标定
EDEM
碰撞恢复系数
wheat
rubber belt
parameters calibration
EDEM
coefficient of restitution
