土壤碰撞问题的刚-散耦合动力学分析

Rigid-Discrete Coupling Dynamic Analysis of Soil Contact/Impact Problem

本文以探测器着陆行星土壤为背景,对土壤碰撞问题进行刚-散耦合动力学建模与仿真分析研究.结合离散元方法和多体动力学方法,对半球壳装置土壤跌落问题进行耦合动力学仿真.通过与实验结果及有限元仿真结果对比,验证所采用离散元方法的有效性.分析了颗粒场中颗粒尺寸、恢复系数、静摩擦系数等参数,对碰撞中物体和颗粒场的碰撞加速度、碰撞持续时间、振动波形等动力学响应的影响.本研究将拓展对刚-散耦合动力学问题的理论认识,为探测器着陆系统的设计提供技术支持.

In this paper,based on the background of the landing soil of the probe,the coupling dynamics modeling and simulation analysis of the soil contact problem are carried out.Combined with the discrete element method and the multibody dynamics method,the coupling dynamics simulation of the soil drop problem of the hemispherical shell device is carried out.By comparing with the experimental results and finite element simulation results,the validity of the discrete element method is verified.The effects of particle size,recovery coefficient,static friction coefficient and other parameters on the collision acceleration,collision duration,vibration waveform and other dynamic responses of the object and particle field in the collision are analyzed.This study will expand the theoretical understanding of the rigid-discrete coupling dynamics and provide technical support for the design of the landing system of the problem.