基于正交试验的汽车白车身优化

Optimization of BIP Based on Orthogonal Test

为了优化白车身低频频率特性,采用有限元软件对白车身进行模态分析,得到模态频率及振型,有限元结果显示白车身低频频率特性不足,需对其进行优化.优化过程中,采用试验设计软件进行全因子试验,以模态频率为约束条件,以白车身重量最低为目标,量化结构板件尺寸并进行试验验证.结果表明:在车身优化中采用全因子试验技术,可以综合考察板件性能,同时简化优化流程,最终白车身在满足低频模态要求的前提下减重7.8,kg.

Modal analysis of BIP was carried out by using finite element analysis software,and modal frequencies and shapes were obtained.According to the analysis result,the low frequency characteristics of BIP were not good and should be optimized.In the optimization process,full factorial experiments were carried out by using test design software.On the premise of low frequency characteristics,the BIP＇s mass was reduced,the plate size was determined,and the experimental verification was carried out.The final results show that the full factor test in the white body optimization process is useful in testing the performance of the plate,while simplifying the optimization process.Finally,the BIP＇s mass was reduced by7.8,kg,while meeting the low frequency characteristics.