空间太阳望远镜主构架的力学分析与优化

Mechanical analysis and optimization of the main truss in Space Solar Telescope

基于航天器结构设计的特殊性,用有限元软件MSC.NASTRAN对空间太阳望远镜主构架进行了力学分析。根据敏度分析方法和优化计算要求,建立了满足结构频率和振型条件、追求重量最轻的优化模型。结合工程优化的特点,提出多种拓扑结构方案,并对主构架进行了拓扑型式比较与选优、形状优化和尺寸优化,最后对多变量优化设计的初值问题进行了探讨。经优化计算及工程处理,使主构架的总重量减少了36%,力学校验和热分析表明优化结构满足整星设计要求。

Based on the extraordinary demands of the space solar telescope, mechanical analysis of the main truss by MSC. NASTRAN software is presented. According to sensitivity analysis and optimization design, the optimization model with the constrained conditions of normal modes and the objective function of total weight is established. Considering the characteristics of engineering optimization, various topology structures are put forward and compared, and then their shape optimization and size optimization are implemented. The issues on initial value of multivariable optimization are also discussed. Determined structure has been reduced by 36% in weight after processed in terms of engineering application. Mechanical verification and thermal analysis show that final structure can satisfy the demands of satellite.