Optics and Precision Engineering, Volume. 27, Issue 5, 1138(2019)

Design and optimize of high tolerance support structure for large aperture space mirror

GUO Jiang1...2, ZHU Lei2, ZHAO Ji3 and GONG Da-peng2 |Show fewer author(s)
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  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
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    In a traditional space mirror, the stress of processing and assembling cannot be eliminated and this causes the surface accuracy of the mirror to degrade. In this study, an optimization method for a high-stability support structure for a space mirror was proposed to solve this problem. A 1.5-m aperture high-tolerance and high-accuracy space mirror for engineering applications was fabricated. First, the initial configuration of the mirror subassembly was designed based on theory and experience. The mirror was composed of reaction-bonded silicon carbide. A back-half open triangle was selected for the lightweight structure of the mirror, and a diaphragm-type flexure structure was used to support the mirror. The main dimensions of the supporting structure were then optimized using iSIGHT, and the minimum change of the root mean square (RMS) in nine situations with a 0.01-mm assembly error was chosen as the target. A mirror with a mass of 170.23 kg and lightweight ratio of 82.1% was obtained in 30 months. A series of tests revealed the following: The surface accuracy of the mirror was 0.016λ RMS(λ=632.8 nm) under 1 g of gravity, and a 0.02-mm forced displacement on the interface of the structure caused no changes. The change scope was 0.002λ(RMS) in a (20 ± 5 ℃ )temperature environment, and the first-order natural frequency of the subassembly was 101.3 Hz. The static stiffness, dynamic stiffness, accuracy of the surface, and environment adaptability of the subassembly were found to meet the requirements of commercial remote sensing.

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    GUO Jiang, ZHU Lei, ZHAO Ji, GONG Da-peng. Design and optimize of high tolerance support structure for large aperture space mirror[J]. Optics and Precision Engineering, 2019, 27(5): 1138

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    Paper Information

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    Received: Nov. 20, 2018

    Accepted: --

    Published Online: Sep. 2, 2019

    The Author Email:

    DOI:10.3788/ope.20192705.1138

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