某轿车白车身结构的灵敏度分析及结构优化  

Sensitivity Analysis and Structure Optimization of Cars with White Body

作　　者：朱茂桃[1] 王中[1] 秦少隽[1] 李凤[1] 范俊[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《重庆交通大学学报（自然科学版）》2011年第2期315-318,共4页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：对某轿车白车身建立有限元模型,进行了理论模态分析,并通过模态试验对有限元模型进行了验证。针对白车身在常用车速下的共振问题,分析了白车身固有频率对各结构板厚度的灵敏度,找出了灵敏度较大的构件。在此基础之上,以低阶模态频率为状态变量,以相对灵敏度较大的板件厚度为设计变量进行优化,取得了较好的效果。In this paper,finite element model of Body-In-White（BIW） of a car was established;theoretical modal analyses were conducted;finite element model was verified by modal tests of BIW ware.Based on the heavy vibration of the white body at normal speed,the inherent frequency and sensitivity of each structural panel were analyzed;components with greater sensitivity were found out.By comparing the relative sensitivities,the influence degree of the different area of the structure was clear;based on some model optimization and modification,a more suitable structure was obtained when taking low-rank modal frequency as state variables and plate thickness with relavitvely greater sensivitiy as variables.

关 键 词：白车身 模态分析 灵敏度分析 优化设计 

分 类 号：U46[机械工程—车辆工程]