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Optimum design of flexible support structure for space mirror
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Paper Abstract

To minimize the assembly stress and thermal stress introduced by the support structure, and ensure the high surface accuracy and high thermal stability of space mirror. An ultra-lightweight design of secondary mirror was carried out for some space remote sensor, and three tangential bipods were used for quasi-kinematic support. Firstly, the design principle of quasi-kinematic support structure was investigated, and advantages of bipod kinematic support were analyzed from the angle of degree of freedom decoupling. Based on structure designed above, the finite element model was established. Taking surface accuracy of the mirror as optimization objectives, the integrated optimization method was adopted to extract the structural parameters with high sensitivity on the surface accuracy in the flexible support structure, and parameters optimization design was carried out. Finally, the static and dynamic characteristics of the optimized mirror assembly were analyzed. The analysis results showed that the surface shape accuracy (RMS) of the mirror assembly is better than 1 nm under a load case of 1g gravity when the optical axis is level. Surface accuracy (RMS) is better than 2 nm under the load case of 4℃ uniform temperature rise. The first-order natural frequency of the secondary mirror assembly is 587 Hz. The optimized mirror support structure can well unload the additional deformation caused by the support structure, and has good dynamic stiffness, which verifies that the designed mirror and its support structure are reasonable, and the optimization design method is reliable. This paper provides a reference and idea for the design of flexible support structure of space mirror.

Paper Details

Date Published: 18 December 2019
PDF: 9 pages
Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 113410X (18 December 2019); doi: 10.1117/12.2543127
Show Author Affiliations
Li Jun Sun, Xi’an Institute of Optics and Precision Mechanics (China)
Key Lab. of Spectral Imaging Technology (China)
Yuan Qing Zhang, Tianjin Medical Technology Development Co., Ltd. (China)
Si Yuan Li, Xi'an Institute of Optics and Precision Mechanics (China)
Key Lab. of Spectral Imaging Technology (China)
Zhao Hui Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Key Lab. of Spectral Imaging Technology (China)
Li Bo Li, Xi'an Institute of Optics and Precision Mechanics (China)
Key Lab. of Spectral Imaging Technology (China)


Published in SPIE Proceedings Vol. 11341:
AOPC 2019: Space Optics, Telescopes, and Instrumentation
Suijian Xue; Xuejun Zhang; Carl Anthony Nardell; Ziyang Zhang, Editor(s)

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