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Multi-object Lightweight Design of BIWs Based on Response Surface Model

WANG Zhenhu;ZHOU Qiaoying;LIU Kaiyong;FANG Xiangdong;LI Luoxing;State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan University;College of Mechanical and Vehicle Engineering,Hunan University;Changan Oushang Automobile Institute;  
The finite element model of BIW of a MPV type vehicle was established based on MSC/NASTRAN software platform.The thicknesses of 19 BIW panels were selected as lightweight design variables by using relative sensibility analysis method.Then,the metamodels of five different performance indexes were established using Latin hypercube sampling method and one order response surface model.The models have high accuracy which the multiple correlation coefficients R2 of all the models are close to 1.0.Finally,taking the minimum mass and maximum torsional stiffness as the objective function,and the bending stiffness and first-order bending and torsion modes as the restraints,a multi-objective lightweight optimization on the BIW was conducted by using NSGA-Ⅱ algorithm.The optimization results indicate that the changes of body performances after lightweight are less than1.0%,and a weight reduction of 6.4 kg is achieved.
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