针对平行光管主镜应用真空垂直状态的特点, 从主镜的支撑方式入手, 推导了适用于 whiffle tree结构的支撑点的位置公式, 设计了空间曲线切口式柔性铰链, 分析了不同结构形式的主镜室的变形。建立主镜室支撑系统的有限元模型, 分析计算了系统的静力学变形和谐振频率, 分析的结果表明在支撑结构的作用下, 主镜镜面的面形 RMS优于 0.05λ, 一阶谐振频率达到 65.9 Hz, 完全达到了设计要求。

Based on the collimator primary mirror in vertical and vacuum, the primary mirror axial support is determined, and the support point position formula is deduced for whiffle tree structure, the flexure hinges with space curve notches is designed, and the deformation of two different primary mirror cell is analysed. The whole primary mirror component system finite element model is built, the system statics deformation and harmonic frequency is calculated. The result indicates that the primary mirror surface figure RMS is less than 0.05λ with the support structure, and the first-order harmonic frequency is reached 65.9 Hz, and all the design requirements are met.