多柔体系统动力学建模理论及其应用

以往对机械系统进行动力学分析 ,要么将其抽象为集中质量—弹簧—阻尼系统 ,要么将其中的每个物体都看作是不变形的刚性体 ,但如果系统中有一些物体必须计及其变形 ,就必须对机械系统建立多柔体模型。本文阐述了柔性体建模理论 ,并用汽车前悬架多柔体模型进行举例说明。结果表明多柔体模型的仿真结果较多刚体动力学模型的仿真结果更接近道路试验数据结果 ,充分验证了多柔体建模的必要性和有效性。

Dynamic Modeling of Multi-Flexible System--Theory and Application

In dynamic analyses of a mechanical system, it is often abstracted as a centralized mass spring damper system, or every part in the system is regarded as a rigid body. However, if some parts deform obviously and their deformation must be taken into consideration, the mechanical system must be modeled as a multi flexible body. In this paper, the flexible body modeling theory is demonstrated firstly. Then, an example of modeling a kind of automobile's front suspension as a multi flexible system is shown. Finally, it is shown that the simulation results of multi flexible dynamic model agree with the road test data more than those of multi rigid dynamic model do. Thus, it is fully testified that using multi flexible body theory to model is necessary and effective.