碰撞安全性, 拓扑, 尺寸优化, 等效碰撞力

In order to improve the performance of vehicle’s passive safety and other performance,engine compartment of a domestic car was optimized.According to the original geometric model,a finite element analysis model was established and the static,modal and 100%RB(rigid barrier) collision analysis were executed.Considering the general arrangement and the joint position of the car,the solid element model was established and the multi-case topology optimization was carried out.Size optimization was implemented for the original design under the integrated case which includes static,modal and equivalent-static 100% RB case.According to the results of topology optimization and size optimization,the FEM was modified and validation was carried out. The results indicate that the performance of 100%RB impact has been improved and the first order bending mode, bending stiffness, torsion stiffness of the front end are increased nearly by 10%, respectively.

crashworthiness, topology, size optimization, equivalent impact force