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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Multiscale Modeling on Contact Dynamics of Multibody Systems
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Multiscale Modeling on Contact Dynamics of Multibody Systems

机译：多体系统接触动力学的多尺度建模

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摘要

In actual joints, clearance, friction and impact forces will play an important role and can have a significant effect on the dynamic response of multibody system. In this study, the kinematic and dynamic force variables are considered in running molecular dynamics simulations, finite element simulations and macroscale system motion. To support the molecular dynamics results, finite element simulations and multibody dynamics simulations are also used to help to elucidate the size scale effects on the kinematics and dynamics between bodies. As an example, a two-linkage system was considered. A comprehensive approach to the modeling of joints with clearance in multibody systems has been presented. The problem was formulated within the framework of multibody dynamics, the finite element method and molecular dynamics approach. The impact of the rough surfaces and microscopic level contact is at least as important as the effect of joint clearance. Considering the effect of the rough surface contact and microscopic level contact in the systems dramatically increases the computational cost, and generates large amounts of "numerical noise". Time step size is an important part of the computational strategy. In the presence of clearance, the effects of dynamic behavior of microscopic level contact were found to be rather small in the sense that they had little impact on the overall dynamic response of the system if the number of microscopic contact peaks is not enough to describe the real surface of the contact areas in the macroscopic level.
机译：在实际的关节中，间隙，摩擦力和冲击力将发挥重要作用，并且可能对多体系统的动力响应产生重大影响。在这项研究中，运动和动力学力变量在运行分子动力学模拟，有限元模拟和宏观系统运动中被考虑。为了支持分子动力学结果，还使用了有限元模拟和多体动力学模拟来帮助阐明尺寸尺度对运动学和体间动力学的影响。例如，考虑了两个链接系统。提出了一种在多体系统中具有间隙的关节建模的综合方法。该问题是在多体动力学，有限元方法和分子动力学方法的框架内提出的。粗糙表面和微观水平接触的影响至少与接头间隙的影响一样重要。考虑到系统中粗糙表面接触和微观水平接触的影响，极大地增加了计算成本，并产生了大量的“数值噪声”。时间步长是计算策略的重要组成部分。在存在间隙的情况下，发现微观水平接触的动态行为的影响很小，这是因为如果微观接触峰的数量不足以描述系统的整体动态响应，则它们对系统的总体动态响应几乎没有影响。宏观水平上接触区域的真实表面。

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