白车身轻量化的一种混合优化策略  

BIW weight reduction by hybrid optimization strategy

作　　者：吴作伟[1] 方立桥[1] 申辰威 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《北京交通大学学报》2014年第1期136-140,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"863"计划项目资助(2011AA11A263)

摘　　要：以某轿车白车身为研究对象,综合考虑弯曲、扭转刚度和模态指标的性能要求,提出一种基于近似模型寻优和灵敏度分析统筹协调变量的混合优化策略.算法同时考虑构造近似模型与灵敏度,对模型进行全局最优化搜索及仿真验证,并根据灵敏度分析所得贡献率,适当调整变量取值,最终使白车身结构的轻量化达到7.51%.结果表明,混合优化策略能够明显提高白车身轻量化设计的效率.Taking a BIW weight reduction as optimization object,the hybrid optimization strategy is proposed based on optimized by approximation model and sensitivity analysis after comprehensively consider three performance requirements about bending stiffness,torsion stiffness and modal.This strategy considers building approximation model and sensitivity analysis proceed at the same time,taking a simulation validation about the optimization design based on the approximation model.According to the sensitivity and the validation results,we adjust the variable values so that BIW weight reduction can reach 7.51％ finally.The result shows that the hybrid optimization strategy can improve the optimization speed effectively.

关 键 词：白车身 轻量化 混合优化 试验设计 近似模型 

分 类 号：U462.34[机械工程—车辆工程]