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Proceedings Paper

Thermal calculation and structure analysis of space Main Optical Telescope
Author(s): Zhiping Chen; Zhiyuan Chen; Shimo Yang; Huli Shi
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Paper Abstract

Primary mirror with Φ 1m and f 3.5m is the most important optical part in the space Main Optical Telescope (MOT). Since its required surface error is less than λ/40(rms.), where λ is about 0.6μm, the mirror deformation induced by space heat and gravity must be within 0.015μm, it's necessary to make thermal calculation and structural analysis to improve its structure. In this paper, the MOT structure and its finite element model is described. The mechanical properties are then analyzed in order to verify whether this structure can meet the optical requirements of sufficient strength, stiffness, and thermal stability. Mechanical analysis is carried out with MSC.Nastran software under 3 different load cases: gravity influence on-ground, dynamic impact during launching, weightlessness and heat environment in-orbit. Space thermal analyses are also done to simulate the space environment. The coupled deformation of heat and structure is finally analyzed. Calculation results show that different support ways and support forces will be the keys to determine the surface precision of primary mirror. The structure can meet the optical demands, but the thermal deformation can not, especially in an asymmetric temperature distribution, which should be tested and controlled by some strict methods.

Paper Details

Date Published: 20 September 2007
PDF: 9 pages
Proc. SPIE 6687, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III, 66870Y (20 September 2007); doi: 10.1117/12.734287
Show Author Affiliations
Zhiping Chen, Hangzhou Dianzi Univ. (China)
National Astronomical Observatories (China)
Zhiyuan Chen, National Astronomical Observatories (China)
Shimo Yang, National Astronomical Observatories (China)
Huli Shi, Hangzhou Dianzi Univ. (China)
National Astronomical Observatories (China)

Published in SPIE Proceedings Vol. 6687:
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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