基于Hypermesh和灵敏度分析的某车型车门轻量化设计

Lightweight design of a vehicle door based on Hypermesh and sensitivity analysis

为改善某车型车门结构的动、静态性能,通过建立车门的有限元模型,进行了有限元模态分析和试验模态分析,并将有限元计算模态与试验模态进行对比以验证有限元模型的正确性;进而采用灵敏度分析方法筛选出影响车门性能的主要部件,使用最优拉丁超立方设计方法对其厚度进行采样,然后以车门刚度和模态频率为约束条件,以车门总质量极小化为目标函数,构建响应面数学模型,最后选用二次序列规划法对车门结构进行优化,结果表明,优化后车门质量降低的情况下,刚度和动态性能均得到了有效改善和提高。

In order to improve the dynamic and static performance of a vehicle door structure,a finite element model of the door was established.And,finite element modal analysis and test modal analysis were carried out.The accuracy of the finite element model was verified by comparing the finite element calculation modal with the experimental modal.Firstly,the main components that affect the performance of the door were screened out by sensitivity analysis.The Optimal Latin hypercube design method was used to sample the sample space.Secondly,an mathematical model of the response surface was constructed,which takes the rigidity and modal frequency of the door as the constraint condition and takes the goal function of improving the total mass of the door as the objective function.Then,the secondary sequence planning method was adopted to optimize the door structure.Finally,the result of calculation show that the door stiffness and dynamic performance have been improved effectively when the quality of the optimized door is reduced.