空间相机主支撑结构拓扑优化设计

针对目前空间相机主支撑结构设计中难于同时保证重量轻且刚度高的问题,提出了采用拓扑优化方法对空间相机光学系统主支撑结构进行优化设计的方案,并采用有限元分析法对两种空间相机主支撑结构优化设计的结果进行了检验。对卡塞格林光学系统和TMA光学系统主支撑结构进行拓扑优化后做了比较,卡塞格林光学系统主支撑结构一阶固有频率从41 Hz提高到72 Hz,重量降低了15%;TMA光学系统主支撑结构在一阶固有频率不降低的情况下,重量降低了35% 。结果表明,采用拓扑优化设计方法缩短了设计周期,提高了空间相机主支撑结构的性能,有效降低了支撑结构重量,满足了系统设计要求。

Topologic optimization design for main supporting structure of space camera

In order to obtain a lightweight and high-stiffness main supporting structure of space camera, a topologic optimization design method of space camera was presented. Based on the method, two kinds of main supporting structures of space camera with Cassegrain and TMA optical systems were optimized using Finite Element Method(FEM). Compared with before optimization, the first -order natural frequency of the main supporting structure of Cassegrain optical system raises from 41 Hz to 72 Hz with 15 percent weight lost,and the main supporting structure of TMA optical system loses 35 percent weight without changing the first-order natural frequency. The numerical results indicate that after adopting the topologic optimization design method, not only the design period is shortened, but also the supporting structure weight is effectively reduced and the capability of the main supporting structure is enhanced also,Which shows that optimized support structures can meet the system design requirements.