多工况下某火炮摇架拓扑优化设计

摘要

In order to improve structure property of the artillery cradle, satisfy the requirement of the structure lightweight design, and reduce the development cycle and development costs, a topology optimization design for the cradle structure is conducted in this article. Through choosing two of the most terrible sub cases which the artillery cradle bears, according to the force of the cradle, the finite element model based on Hypermesh-OptiStruct software can be obtained. By using topology optimization based on artificial material method, the geometric model of cradle can be obtained of which low density area is removed. Then in order to obtain the final optimization results, a Boolean sum operation is applied to the geometric model from two sub cases. Analysis results show that after the topology optimization, the stiffness of the cradle is higher than the one without optimization and the weight has some reduction. The result can satisfy the requirement of the artillery overall dynamic and static response.%为提高某火炮摇架的结构性能，满足结构的轻量化设计要求，减少研发周期和降低研发成本，对该摇架的结构进行拓扑优化设计。通过选取某火炮摇架承载最恶劣的2个工况，根据摇架的受力情况，基于Hypermesh-OptiStruct软件平台建立其有限元模型，采用变密度方法的拓扑优化技术，对摇架的拓扑优化获得去除低密度材料区域后的几何模型，并对2个工况下得到的几何模型进行布尔和操作以获得最终的优化结果。分析结果表明：经过拓扑优化后，模型质量减轻，刚强度与优化前相比有所提升，能够满足火炮总体的动/静态响应特性要求。