振动平面上粒群运动的离散元模拟

Simulation of Discrete Element of Particles Motion on the Vibration Plane

粒群在振动平面上的运动在各种工业过程中广泛存在.为深入认识其复杂的类流体力学特性,对一个矩形振动盒内粒群的运动状态进行了离散元模拟,借助高速动态分析系统进行了同等条件下的电动振动试验台物理试验.通过模拟再现了“巴西果”现象.为考察粒群的松散度,定义了“膨胀系数”指标,通过试验得到了不同料层厚度下“膨胀系数”同振动盒的振幅及振动频率之间的数学关系式.模拟结果证实了计算参数对离散元法模拟结果的影响,通过选择合理的计算参数,模拟结果同试验结果能够很好地吻合.

The motion of particles on the vibration plate exist widely in all kinds of industrial processes. To further study their complex characteristics of analogical hydromechanics, a simulation of discrete element of the motion state of particles in a rectangular vibration box was carried out. Using a MEMRECAM Ci3 advanced high-speed dynamic analyzing system, some experiments were completed on a dynamoelectric vibration bed under the same conditions. The simulation truly exhibited the Brazil Nut Effect. For evaluating the loose degree of particles, an index of expansion coefficient was introduced, and a relation model between expansion coefficient and amplitude and frequency of vibration box under the different height of bed. The results validate that parameters have effect on the simulation results, and by selecting rational parameters, the simulation results are in good accordant with the experimental ones.