Model smoothing method of contact-impact dynamics in flexible multibody systems

Model smoothing method of contact-impact dynamics in flexible multibody systems
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柔性多体系统接触碰撞动力学模型平滑方法

DOI:
10.1016/j.mechmachtheory.2019.03.039
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发表时间:
2019-08
影响因子:
5.2
通讯作者:
Guo Shudong
Guo Shudong
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhang Xingang;Qi Zhaohui;Wang Gang;Guo Shudong

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本文提出了一种柔性多体系统中接触碰撞动力学的原始模型平滑方法。首先,采用模型平滑方法提高计算效率,在建模阶段将柔性体的瞬时应力替换为短时间内的时间平均应力,得到的运动方程不包含高频分量。下面讨论连续接触力模型的基本问题。提出了一种用于柔性多体系统动力学分析的线性互补问题(LCP)建模的平滑方法。这种方法考虑了永久接触和冲击,其最大优点是可以直接使用,无需切换接触模型。数值结果表明,模型平滑方法是柔性多体系统接触碰撞问题数值分析的一种新的有效方法。
An original model smoothing method for contact-impact dynamics in flexible multibody system is proposed in this work. First, the model smoothing method is applied to improve the computational efficiency, in which the instant stresses of flexible bodies are replaced by the time-averaged stresses in a short time during the modeling stage, the resulting equations of motion do not contain high frequency components. In the following, the fundamental issues of continuous contact force models are discussed. A smoothing method of modeling linear complementarity problem (LCP) is proposed for the dynamic analysis of flexible multibody system. This approach takes into account the permanent contact and impact, which has the great merit that can be used straightforward without switching contact models. Numerical results show that the model smoothing method is a new effective approach for the numerical analysis of contact-impact problems in flexible multibody system.
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发表时间: 2009
期刊: --
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