| 空间引力波望远镜主镜组件的结构设计 |
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| 引用本文： | 李钰鹏,王智,沙巍,吴清文,赵亚.空间引力波望远镜主镜组件的结构设计[J].红外与激光工程,2018,47(8):818004-0818004(7). |
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| 作者姓名： | 李钰鹏 王智 沙巍 吴清文 赵亚 |
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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; |
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| 基金项目： | 中国科学院战略性先导科技专项（B）（XDB23030000） |
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| 摘 要： | 针对空间引力波望远镜皮米量级的极高光程稳定性需求，对系统中主镜组件进行了优化设计。采用微晶玻璃（Zerodur）作为反射镜材料，支撑结构材料为铟钢（4J36）。首先，通过对反射镜参数的优化，使其在保证面形精度的同时镜体轻量化率达到了72%。然后，设计了一种双轴联杆型Bipod柔性反射镜支撑结构，并采用了侧面三点支撑的形式。以保证有效的支撑刚度及卸载效果为目的，建立了柔性铰链的数学模型，并基于Matlab对其尺寸参数进行了优化。最后，对优化设计后主镜组件进行了模态分析及振动试验，并完成了在轨分析与波前质量计算。结果显示，主镜组件的一阶固有频率为373 Hz，与试验结果的相对误差为3.5%；在轨环境下主镜面形精度达到8.9 nm（RMS）；波前精度为/5（=1 064 nm）。表明该反射镜组件满足设计指标要求。
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| 关 键 词： | 引力波望远镜 主镜组件 优化 波前 |
| 收稿时间： | 2018-03-21 |
Structural design of primary mirror subassembly for spatial gravitational wave telescope |
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| Affiliation: | 1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academic of Sciences,Changchun 130033,China;2.University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | Aiming at the extremely high optical path stability requirements of the spatial gravitational wave telescope in the order of picometer, the main mirror components in the system were optimized. Zerodur was chosen as the material of the primary mirror, the support structure was Invar. Firstly, through the optimization of the parameters of the mirror analysis, while ensuring the accuracy of the surface, the mirror light weight rate reached 72%. Then a biaxial joint Bipod flexible mirror support structure was designed, using the side of the three-point support form. In order to ensure the effective support stiffness and unloading effect, the mathematical model of the mechanism was established, and its size parameters were optimized based on Matlab. Finally, the modal analysis and vibration test of the primary mirror components were optimized, and the on-orbit analysis and wavefront quality calculation were completed. The results show that the first-order natural frequency of the primary mirror component is 373 Hz, and the relative error of the test result is 3.5%. The main mirror accuracy is 8.9 nm(RMS); wavefront accuracy is /5(=1 064 nm). The analysis results show that the reflector assembly meets the design requirements. |
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