某SUV车架多目标拓扑优化设计  

Multi-objective topology optimization design on SUV frame

作　　者：向湘林[1] 左孔天[1] 向宇[1] 曾昭贤[1] 

机构地区：[1]广西科技大学汽车与交通学院,广西柳州545006

出　　处：《计算机辅助工程》2012年第5期20-24,共5页Computer Aided Engineering

摘　　要：为得到同时满足刚度和动态要求的SUV车架,基于SIMP材料插值方法,分别以刚度最大和低阶模态固有频率最大作为优化目标建立拓扑优化模型,利用折中规划法建立多工况下刚度和低阶固有频率多目标优化模型,通过拓扑优化迭代得到新的SUV车架;对新车架进行仿真分析,得到其位移和应力分布及前4阶固有频率.其静态特性满足材料要求且有很大提高,第1阶固有频率提高到30.3 Hz,新车架质量减轻到193.3 kg.计算结果表明该方法能够很好地解决多目标下的结构优化问题。To design a SUV frame which meets stiffness and dynamic requirements, based on the SIMP material interpolation method, the topology optimization models are built of which the target functions are the maximization of stiffness and natural frequency of low-order mode. Then the compromise programming method is used to establish a multi-objective optimization model considering stiffness and natural frequency of low-order under multiple working conditions. A new SUV frame is obtained through the topology optimization iteration. By the simulation analysis on the new frame, the displacement and stress distribution, and the natural frequency of first four orders are obtained. The static characteristics can meet the material requirements and are greatly improved; the first order natural frequency is increased to 30.3 Hz, and the mass of the new frame is also reduced to 193.3 kg. The calculation results show that the method can solve the structure optimization problem under multiple objects.

关 键 词：SUV车架 刚度 动态特性 静态特性 SIMP材料插值 固有频率 折中规划 拓扑优化 

分 类 号：U463.32[机械工程—车辆工程]