机械基础结构多目标拓扑优化设计方法

Multi-objective Topology Optimal Design of Mechanical Infrastructure

机械的基础结构在保证具有足够的刚度、强度和稳定性的条件下,经济性也必须要好,因此机械基础结构常采用内部布置有加筋板的箱体结构。以某机械基础结构为例,分别用基于经验设计的内部筋板布置方法和多目标拓扑优化方法进行优化设计,得到了2种设计方案;比较了2种方案的动静态力学性能。结果表明,多目标拓扑优化设计的基础结构比一般经验设计的结构,刚度有所提高,而结构质量减小11.21%,一阶固有频率提高25.07%。

Mechanical infrastructure should have good economic efficiency under the condition of sufficient rigidity, strength, and stability. Therefore, box structure with inner stiffener plates is usually applied for mechanical infrastruc- ture. Empirical design method and multi-objective topology optimal design were carried out respectively on layout of in- ner stiffener plates of a sample mechanical infrastructure, and two design schemes were obtained. The static and dy- namic mechanical properties by the two design schemes were compared. The result showed that multi-objective topology optimal design is much better, by which the rigidity of the optimized structure is improved, the weight of the optimized structure is reduced by 11.21% , and the first natural frequency is increased by 25.07% by compared with that of the empirical design method.