基于模态贡献量诊断法提高副车架结构动刚度方法研究

Research on the Dynamic Stiffness Improvement of the Subframe Based on Modal Participation Diagnosis Method

针对某型车底盘开发设计过程中副车架与摆臂前安装点动刚度偏低的问题,建立以副车架为主体的有限元模型,运用模态贡献量诊断方法研究了影响副车架动刚度的主要模态成分,并通过模态分析根据主要模态成分的应变能分布判断影响副车架动刚度的主要区域。通过优化这些区域的结构,最终实现了副车架动刚度的提高,从而达到了目标的要求。

Considering the problem of the lower dynamic stiffness of the connection between the subframe and control arm in the developing process of the vehicle chassis,the finite element model of the the subframe was constructed,and the method of the modal participation diagnosis was applied to research the main mode composition which influenced the dynamic stiffness of the subframe. And then according to the strain energy distribution of the main mode composition,the main areas which influenced the dynamic stiffness of the subframe were researched. By means of optimizing the structure of these areas,the dynamic stiffness of the subframe is improved to the target request.