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文章针对轻量化程度较高的SiC空间反射镜,探讨了其在重力环境下反射镜面形检测所需要的卸载支撑方法。为了使重力对反射镜面形精度的影响降低到可接受范围内,在光轴竖直时,将支撑结构对反射镜的作用简化为卸载力,优化力的数量、位置及大小,使反射镜面形精度达到近似零重力情形,并分析了反射镜水平倾斜0.5°、1°时,反射镜面形对位置误差的敏感程度;光轴水平时,在对反射镜设计支撑结构的同时,加入3点、6点辅助卸载力来降低残余重力影响,使反射镜面形接近无重力情形。通过Patran/Nastran软件建立反射镜模型并进行仿真计算,输出反射面各结点坐标值及变化量,用Matlab程序计算出反射镜面形精度,结果表明优化后的设计结果满足指标要求。
In this paper, aiming at the low-weight SiC space mirror, the disassembly and support methods required for mirror surface detection in gravity environment are discussed. In order to reduce the influence of gravity on the mirror surface accuracy to an acceptable range, the effect of the support structure on the mirror is simplified to the unloading force while the optical axis is vertical, and the quantity, position and size of the force are optimized so that the mirror surface The accuracy of which reaches the approximate zero gravity situation and the sensitivity of the mirror shape to the position error when the mirror is tilted horizontally by 0.5 ° and 1 ° is analyzed. When the optical axis is horizontal, three points are added to the design of the support structure for the mirror, Auxiliary unloading force of 6 points to reduce residual gravity effect, so that mirror surface shape without gravity. The mirror model was established by Patran / Nastran software and simulated. The coordinate values and variation of the reflector surface were output. The precision of reflector surface shape was calculated by Matlab program. The results showed that the optimized design results meet the index requirements.