基于多学科设计优化方法提高汽车后门性能

Improving the performance of automobile reardoor based on multidisciplinary design optimization method

在对某汽车后门有限元模型进行模态、扭转刚度和下垂刚度分析的过程中,发现汽车后门的扭转模态不满足目标值。通过灵敏度分析方法找出关键件,采用HyperStudy软件对其进行多学科设计优化并验证。结果表明:经过优化后,汽车后门扭转模态提高了2.03 Hz,扭转刚度的加载点位移从5.863 mm降低到了5.126 mm,下垂刚度的加载点位移的绝对值从2.588 mm降低到了2.534 mm,后门质量仅增加了0.02 kg。这说明多学科设计优化在同时优化模态、刚度和轻量化等多个目标时具有良好的效果。

In the process of the modal,torsional stiffness and sagging stiffness analysis of the finite element model of the automobile reardoor,it is found that the torsional modal of the automobile reardoor does not meet the target value.The key components are identified by sensitivity analysis method,and are optimized and verified the multidisciplinary by using the HyperStudy software.The results show that after optimization,the torsional modal of the automobile reardoor is increased by 2.03 Hz,the displacement of the torsional stiffness loading point is reduced from 5.863 mm to 5.126 mm,the absolute value of the displacement of the sagging stiffness loading point is reduced from 2.588 mm to 2.534 mm,and the reardoor quality is only increased by 0.02 kg.This shows that the multidisciplinary design optimization has a good effect when simultaneously optimizing multiple targets such as modality,stiffness and lightweight.