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为探索大口径超轻高精度可展开光学系统的可行性,对5 m全口径空间可展开主镜的2 m离轴分块镜进行了研究。首先通过分析和比较,确定了分块镜的材料、轻量化结构型式和支撑点的位置;然后,通过有限元建模和分析,得到面密度小于40 kg/m2的超轻量化分块镜初始结构;最后,在分块镜3D板壳模型的基础上建立了带三个定位孔的3D实体模型。分析结果显示,分块镜在支撑条件下自重变形误差为7.93 nm RMS/46.9 nm PV,优于面形精度λ/50 RMS的要求,实现了超轻量化和高精度,且分块镜能承受发射状态下的力学环境。该研究为大口径超轻高精度可展开光学系统的工程应用提供了一种技术方案,具有工程实用价值。
In order to explore the feasibility of a large-diameter, ultra-light, high-precision expandable optical system, a 2 m off-axis block mirror with a 5 m full-aperture spatially expandable primary mirror was studied. Firstly, the material, the structure of light weight and the position of the support points were determined by analysis and comparison. Then, the initial stage of the ultra-light weight segment mirror with the areal density less than 40 kg / m2 was obtained by finite element analysis and modeling Structure. Finally, a 3D solid model with three positioning holes was established based on the 3D shell model of the segmented mirror. The analysis results show that the self-weight deformation error of the segmented mirror under the supporting condition is 7.93 nm RMS / 46.9 nm PV, which is superior to the requirement of the surface shape accuracy of λ / 50 RMS, achieving ultra-light weight and high precision, and the segmented mirror can withstand Mechanical environment under launch. The research provides a technical solution for engineering applications of large-caliber ultra-light and high-precision expandable optical system and has practical value in engineering.