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Proceedings Paper

Design of bipod flexures for space mirror
Author(s): Chang-bo Chu; Ying-cai Li; Wen-yi Chai; Xue-wu Fan
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Paper Abstract

Bipod flexures are used in many high-precision space mirror mount applications. The flexures are used to provide moment isolation for the mirror to minimize surface figure distortion resulting from mount assembly error or distortion of the mount temperature-change-induced. In this paper, we developed a bipod flexure for the Zerodur primary mirror with diameter 520 mm and thickness 70 mm. The characteristic of the bipod flexure is the two-strip flexure on the top and bottom of each leg. By those, the bending stress in mirror resulting from the mount assembly is remarkably reduced. Thanking to a semi-open structure with small mouth and big stomach in the back and a six parts symmetrical honeycomb structure for the primary mirror, using the FEA (Finite Element Analysis) method we analyze that how the axial and circumferential locations of the three bipod flexures impact mirror surface figure and gain the better result after optimization. In the design of the detail bipod flexures, thickness of the blade is analyzed and compared; also we achieve an optimization design. The two results demonstrate that the bipod flexures could keep the precision of the mirror surface figure under the load of external force and thermal constraints and meanwhile they could keep stability of structure.

Paper Details

Date Published: 15 August 2011
PDF: 11 pages
Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 819620 (15 August 2011); doi: 10.1117/12.902227
Show Author Affiliations
Chang-bo Chu, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate School of CAS (China)
Ying-cai Li, Xi'an Institute of Optics and Precision Mechanics (China)
Wen-yi Chai, Xi'an Institute of Optics and Precision Mechanics (China)
Xue-wu Fan, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 8196:
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications
John C. Zarnecki; Carl A. Nardell; Rong Shu; Jianfeng Yang; Yunhua Zhang, Editor(s)

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