基于OptiStruct的望远镜主框架拓扑优化设计

Topologic Optimization Design of Telescope Main Frame Based on Optistruct

针对某航空望远镜主结构的重量过高的问题,提出了对航空相机望远镜主框架进行拓扑优化设计的方法。基于拓扑优化理论,在重力过载的工况下对望远镜主框架拓扑优化,以整个框架作为设计变量,以框架的体积分数和固有频率作为约束条件,选结构的柔度最小化为目标函数,建立拓扑优化模型。采用MSC.PATRAN/NASTRAN软件对航空望远镜拓扑优化结果进行仿真,分析结果表明,结构的重量减少了77%,结构静态刚度提高,动态刚度符合要求,温度变化环境下光学成像条件改善。

In order to reduce the weight of an aerial telescope main structure, a topologic optimization design method of the aerial telescope main frame was presented. The telescope main frame with overloaded gravity was optimized based on topologic theory. The topologic optimization model takes the whole frame as variation, takes volume fraction and natural frequency as computing constrains, takes the maximal structure stiffness as the objective function. The resulted model was analyzed with MSC.PATRAN/NASTRAN software. The result indicated that the structure＇s total weight was reduced 77%, the structure＇s static stiffness increased, the dynamic stiffness was suitable and the optical imaging condition was improved.