关键词: 全框式副车架, 方差分析, 近似模型, 优化设计

Abstract:

In order to optimize design of a whole box-type sub-frame side rails in terms of structural parameters to meet the requirements for light weight and crashworthiness in front impact,an optimization mathematical model was established in terms of design variables of the sub frame side rails. First, analysis of variance was carried out to choose the factors that had significant influences on the light weight and crashworthiness of sub-frame side rails as the main design variables. Secondly, a design test was conducted by using orthogonal experimental design method. Then, the Ls-dyna program was utilized for crash simulations. A response surface approximation model was built up according to the simulation results, and the approximate model was validated to solve the reliability problem. The results show that the model established by the response surface is suitable for solving the combined optimization problem in this study. The optimized sub-frame side rails can improve crashworthiness performance while maintain a good light-weight level.

Key words: whole box-type sub-frame side rail, analysis of variance, approximation model, optimization design