基于简化碰撞仿真模型的概念汽车部件布局优化

Optimization of the layout of concept vehicle key parts based on simplified auto crash simulation model

提出了基于被动安全的概念车简化模型下的主要部件布局的多目标优化设计方法。首先用多质量弹簧系统等效成整车模型,再用弹簧刚度折线表示各个主要部件的受力关系,用最大相对位移量描述各个主要部件的相对位置关系,即整车结构布局参数,最后使用多目标优化方法以加速度峰值等为目标、整车结构布局参数为参数迭代计算得到优化解。最后通过仿真算例验证了本文方法的有效性。

The power assembly acceleration,the maximum car-body acceleration and power acceleration stiffness are the most important factors in vehicle passive safety.Therefore,in concept auto design these factors must be considered.In this paper a layout optimization method of the key parts of simplified model of concept auto,equivalent to a mass-spring system,is proposed.In the system,the forces among the parts are transformed to spring stiffness broken lines,and relative positions of the key parts are described by the relative maximum displacements,which are taken as the parameters in the optimization.Multi-objective optimization is applied in the concept car layout,and the objectives are the acceleration and so on.The overall optimal lay out of the vehicle structure is obtained by parameter iteration.The feasibility of the proposed optimization method is proved by simulation of a concept vehicle lay out example.