Abstract:

This paper presented a multi-objective topology optimization method for bus chassis frame, in which both the compliance and eigenfrequencies were regarded as static and dynamic optimization objectives.Based on the SIMP(solid isotropic material with penalization) method,compromise programming method was adopted to define objectives of multi-objective topology optimization and multi-stiffness topology optimization,mean frequency method was adopted to settle eigenfrequencies of free vibration optimization.This approach overcomes the shortcoming of single-objective optimization methods which can not simultaneously consider other objectives and suits to multi-objective topology optimization of continuum.

Key words: chassis frame;multi-objective;topology optimization;compromise programming

摘要：

为了研究以静态多工况下刚度和动态振动频率为目标函数的车架拓扑结构，提出了一种结构的多目标拓扑优化研究方法。基于实体各向同性材料惩罚函数的拓扑优化方法，采用折衷规划法定义多目标拓扑优化和多刚度拓扑优化的目标函数，而振动固有频率拓扑优化的目标函数则采用平均频率法定义。通过优化得到了同时满足静态刚度和振动低阶频率要求的汽车车架结构拓扑。该方法避免了单目标拓扑优化无法考虑其他因素的缺点，适合连续体结构的多目标拓扑优化。

关键词: 车架；多目标；拓扑优化；折衷规划