多目标稳健优化设计方法在车身设计制造中的应用研究

APPLICATION RESEARCH OF MULTI-OBJECTIVE ROBUST OPTIMIZATION FOR DESIGH AND MANUFACTURE IN VEHICLE BODY

传统的稳健优化设计方法只是针对单目标响应进行的优化设计.然而,评价一个产品的质量特性应该是多方面的并且各个质量特性之间可能会发生相互冲突,因此,研究实用和高效的多目标稳健优化设计方法具有非常重要的现实意义.论文提出了采用双响应面思想分别构造出每个产品特性和约束条件的均值和方差的响应面模型,在此基础上,将质量工程中的6σ理念与双响应面相结合,构造出了基于6σ质量工程的多目标稳健优化设计方法.将该方法分别应用到了汽车碰撞和板料成形优化设计中,优化设计的结果显著提高了汽车碰撞和板料成形质量的稳健性.算例表明,该方法具有较高的精度和较强的工程实用性.

Conventional robust optimization design methodology is only concerned with optimization of a single response or quality characteristic.However,products are typically characterized by numerous quality characteristics and quality characteristics are often conflicted each other.Therefore,it is very important to develop a efficient and effective multi-objective robust optimization methodology.In this paper,we present that the mean and variance of product characteristics and constraints are constructed to use dual response surface methodology.At the foundation of that,integrating 6σ with dual response surface methodology,we establish a multi-objective robust optimization methodology based 6σ.The method is applied to optimize vehicle crashworthiness and sheet metal forming.The optimal result significantly improves robust of vehicle crashworthiness and sheet metal forming.Numeral example has indicated that this method has higher precision and stronger project practicability.