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支撑方式对大型光学元件的镜面变形及应力集中具有重要影响。以大口径、非均匀质量分布、二维旋转棱镜为研究对象,综述了多点支撑和面支撑方式,提出了可调分段面支撑方法,并给出具体的方案设计。系统地分析了面支撑方式下棱镜的运动过程,得到最危工况。采用两步优化方法对该工况下的支撑夹角进行优化,优化后棱镜运动过程中的最大变形峰谷值与最大等效应力值相比优化前分别减小了7.40%和11.45%,支撑效果得到了明显改善,验证了该支撑方式的合理性及可行性。
The way of support has important influence on the mirror deformation and stress concentration of large optical components. With large caliber, inhomogeneous mass distribution and two-dimensional rotating prism as the research object, the multi-point support and the surface support method are summarized. The adjustable segmented surface support method is proposed and the specific scheme design is given. This paper systematically analyzes the movement process of the prism under the surface support mode and obtains the most dangerous condition. The two-step optimization method was adopted to optimize the included angle of the support. The maximum peak-to-valley deformation in the prism movement was reduced by 7.40% and 11.45% respectively compared with the maximum equivalent stress before optimization, The effect has been significantly improved to verify the rationality of the support and feasibility.