| 1.2m SiC主镜轻量化设计与分析 |
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| 引用本文： | 王富国,杨洪波,赵文兴,杨飞.1.2m SiC主镜轻量化设计与分析[J].光学精密工程,2009,17(1). |
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| 作者姓名： | 王富国 杨洪波 赵文兴 杨飞 |
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| 作者单位： | 1. 中国科学院,长春光学精密机械与物理研究所,吉林,长春,130033;中国科学院,研究生院,北京,100039
2. 中国科学院,长春光学精密机械与物理研究所,吉林,长春,130033 |
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| 基金项目： | 中国科学院三期创新基金 |
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| 摘 要： | 为了探索研究大口径轻量化SiC主镜的可行性,对比分析了各种主镜轻量化形式的优缺点,确定了主镜的支撑方式;然后,从理论上计算了轻量化镜体结构参数,设计了采用夹心三明治结构扇形轻量化孔形式的1.23 m SiC轻量化主镜.利用有限元方法分析了轻量化主镜在浮动支撑下的自重变形,两种工况下的面形分别为:PV=9.43 nm,RMS=2.5 nm;PV=16.7 nm,RMS=3.2 nm.分析结果表明,镜体的自重变形影响较小,可以满足要求.而由于SiC的热膨胀系数较大,热变形影响较大,在稳态温度场下,温度每相差1 ℃,镜面面形变化约为PV=40 nm,RMS=4.8 nm,说明为了达到了设计要求,必须对镜体采取热控措施.
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| 关 键 词： | 望远镜 主镜 轻量化 有限元法 |
Lightweight design and analysis of a 1.2m SiC primary mirror |
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| WANG Fu-guo,YANG Hong-bo,ZHAO Wen-xing,YANG Fei.Lightweight design and analysis of a 1.2m SiC primary mirror[J].Optics and Precision Engineering,2009,17(1). |
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| Authors: | WANG Fu-guo YANG Hong-bo ZHAO Wen-xing YANG Fei |
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| Affiliation: | 1.Changchun Institute of Optics;Fine Mechanics and Physics;Chinese Academy of Sciences;Changchun 130033;China;2.Graduate University of Chinese Academy of Sciences;Beijing 100039;China |
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| Abstract: | In order to explore the feasibility of the large lightweight SiC primary mirror,the different lightweight forms were compared and a supporting way for the primary mirror was determined.After theoretically calculating the light weighted structure parameters,a sandwich structure SiC primary mirror with sector holes was designed.With the finite element method,the self-weight deformation for the lightweight mirror upholded by a float support was analyzed.Under the two different conditions,the mirror surface fig... |
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| Keywords: | telescope primary mirror lightweight finite element method |
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