基于刚度性能优化的比例灵敏度方法研究

Study on proportional sensitivity method based on stiffness optimization

文章针对某款微型纯电动汽车扭转刚度不足的问题,在详细参数设计阶段提出了用比例灵敏度方法为基础对白车身结构件进行尺寸优化。首先利用Hyper Mesh软件建立正确的白车身有限元模型,并对其刚度性能进行分析;基于扭转刚度性能提升的需求,在已有灵敏度方法研究的基础上,提出了比例灵敏度变量优选方法;最后建立优化数学模型,以车身质量最小化为目标、扭转刚度性能要求为约束,通过优化白车身薄板件厚度,得到满足性能要求的车身结构。优化后扭转刚度提升了24.56%,验证了比例灵敏度变量优选方法对结构刚度性能提升的有效性。

In order to solve the problem of insufficient torsional stiffness of a Micropure electric vehicle,this paper proposes to optimize the size of BIW structural parts based on proportional sensitivity method in the stage of detailed parameter design.Firstly,a correct finite element model of BIW is built in Hyper Mesh and the stiffness performance is analyzed.In order to improve the torsional stiffness of BIW,this paper presents a method of proportional sensitivity variable optimization based on the existing sensitivity methods.Finally,a mathematical optimization model is established to optimize the thickness of body panels which is conducted with an objective of minimizing the mass of the BIW and a consideration of the requirements of torsional stiffness.The results show that the torsional stiffness is improved by 24.56%,verifying that it is feasible to use the proportional sensitivity method to improve the structural stiffness performance.