基于DEM算法的多颗粒碰撞耗能机理分析与振动抑制研究

针对机械构件主系的封闭空间中填充微小颗粒,进行振动抑制问题,对填充颗粒的尺寸、数量以及材料特性因素对振动抑制效果的影响开展了研究。通过采用离散单元法(discrete element method,DEM),分析了颗粒与颗粒以及颗粒与主系统之间的运动学特性,建立了能够充分表达颗粒在相互碰撞摩擦过程中的受力、变形关系以及耗能计算模型,分析了多个颗粒之间的碰撞与耗能机理,确定了碰撞过程中颗粒的状态、受力及耗能大小的计算求解算法。在Matlab环境下,针对不同颗粒材质、数量及大小对系统振动抑制性能进行了仿真分析,得出了颗粒材质大小以及数量对减振性能的影响规律,并通过搭建的试验台,进行了试验数据采集和分析。试验结果与仿真结果相吻合,验证了算法的有效性,该算法为提高机械构件的减振性能设计提供了重要参考。

Analysis of energy dissipation mechanism and vibration restrain about particles damping based on DEM

Aiming at the Mechanism main system with closed space which was filled in with tiny particles;vibration control problem was studied by analyzing the vibration control effect which was impact by the particles size number and material characteristic.Discrete element method (DEM) was used to analyze the kinematics characteristic among particles and particles with main system.Calculation models which can represent particles forces distortion and energy dissipation during impact collision and friction were established.The mechanism of collision and energy dissipation among particles was studied.The method which can determine the magnitude of particles state,force and energy dissipation during collision were found.The vibration property which is influenced by the particles material numbers and sizes was demonstrated by using Matlab.The vibration restrains rule was shown which was influenced by size number and material of particles.A test-bed was established.The testing result were identical with the simulation result,which shows that the algorithm is validity,this algorithm can provide an important reference for promoting vibration restrain design of the mechanism.