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| Structure design and optimization of M3 in large-aperture telescope |
| ZHU Bo1,2, YANG Hong-Bo1, ZHANG Jing-Xu1, ZHANG Li-Min1 |
1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China；
2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract As one vital part of the large-aperture ground-based electro-optical telescope (LGEOT),surface quality of the tertiary mirror M3 directly affects the imaging quality of telescope optical system. The geometrical dimension, material, structure of lightweight holes, support methods were analyzed to achieve more accurate M3 structure. The support points, thickness of hole, plane, rib, rim and rim-chamfer of M3 were optimized by means of finite element software ANSYS, MSC.Patran/Nastran to get optimal structure parameters. The optimized M3 structure makes the surface figure deformation PV value 38.03 nm, RMS value 8.98 nm and both meet the optical requirement. The results may offer some reference to the design in this area．
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Published: 28 December 2010
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大口径望远镜三镜结构设计及优化
第三反射镜(简称三镜)在大口径地基光电望远镜系统中作为关键部件之一,其面形精度直接影响着望远镜光学系统成像质量.为准确设计出符合工程实际的三镜结构,从三镜镜体几何尺寸、镜坯材料、轻量化孔结构形式、支撑方式等方面进行分析，并借助于有限元工程分析软件ANSYS,MSC.Patran/Nastran对三镜的支撑点位置、支撑孔壁厚度、镜面面板厚度、镜子外边框厚度、背部肋板厚度以及镜子外边缘倒角尺寸等镜体结构参数进行优化分析,得到了使镜面面形最优的镜体各结构参数.优化后三镜镜面变形RMS值为8.98 nm、PV值为38.03 nm,均满足光学设计要求.研究成果可为同类光机系统设计提供参考.
关键词：
三镜,
有限元分析,
参数优化,
大口径望远镜
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