YUAN Huan quan, CHEN Dong, ZHANG Qi, LIU Xiang zheng

 

(Automotive Engineering Institute, Guangzhou Automobile Group Co., Ltd, Guangzhou 511434, China)

 

 

Abstract: Aiming at the problem that CAE analysis always falls behind the product development and can′t support the car body stiffness modal performance to reach the target value during the prime of platform modular modeling, a research on one B platform model sedan of GAC was made. Firstly , before the detailed engineer data is published mesh morph method was used to convert a B platform sedan to a C platform sedan. Secondly, sensitivity analysis method and multi objects optimization method were used to optimize the stiffness modal performance of the new born sedan. Thirdly, sensitivity analysis method and performance optimization method were applied to make a weight lighting analysis. Fourthly, stiffness mode experiment was used to test the body detailed engineer data and a comparison between the experiment result and the analysis result was made. The results indicate that the car body modeling time which used to be more than two weeks by several persons in traditional way ,can be reduced to one hour by one person ,and the car body stiffness modal performance is increased by 6% , at the same time the weight is reduced by 8.9kg, all of these guarantee the car performance in the later product detailed design process ,thus CAE analysis will play a more important role in the automobile platform modular development.

 

Key words: modularization; finite elements morph; sensitivity; multiobjects; the previous optimization; CAE