校车底盘车架结构静动态特性拓扑优化设计研究  

The Research on Static-Dynamic Combined Topology Optimization Technique of School-Bus Chassis Frame

作　　者：李礼夫[1] 许树龙[1] 

机构地区：[1]华南理工大学机械与汽车学院广东省汽车工程重点实验室,广东广州510640

出　　处：《机械设计与制造》2016年第5期9-13,共5页Machinery Design & Manufacture

基　　金：广州市科技计划项目(11G0068)

摘　　要：针对一款城市专用校车底盘车架结构一阶固有频率偏低的问题,研究了其拓扑结构与静动态特性之间的关系,提出了基于静动态特性的校车底盘车架结构多目标拓扑优化设计方法,即以多工况下的底盘车架结构静态刚度和一阶固有频率最大为目标函数,以拓扑区域体积比为约束函数,建立其结构拓扑优化模型,利用Hyper Works的Optistruct软件对底盘车架结构进行多目标拓扑优化设计,结果表明,优化设计的底盘车架结构在静态刚度保持不变的前提下,其动态一阶固有频率提高了34.6%,较好地解决了校车底盘车架动态特性较差的问题。In order to enhance the dynamic characteristic of a school-bus chassis frame,which has low 1st model frequency and would cause poor NVH performance,a study on the relationship between structural topology and static-dynamic characteristic is constructed. In order to maximize both static stiffness and 1st model frequency of the chassis frame,the compromise programming technique has been applied. By establishing the corresponding mathematical model and being solved by Optistruct solver,the school-bus chassis frame is optimized,and the topology structure which satisfies static-dynamic combined characteristic is obtained. Based on the material density nephogram of optimized structure,the chassis frame is modified. The results show a 34.6% increase of the 1st model frequency,and the static characteristic also meets the correlative technique requirement,which demonstrates the correctness and effectiveness of the optimization method and the problem of the poor dynamic characteristic is solved.

关 键 词：校车 底盘车架 静动态特性 拓扑优化 

分 类 号：TH16[机械工程—机械制造及自动化]