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Proceedings Paper

Light-weight telescope structure optimized by genetic algorithm
Author(s): Mikio Kurita; Hiroshi Ohmori; Masashi Kunda; Hiroaki Kawamura; Noriaki Noda; Takayuki Seki; Yuji Nishimura; Michitoshi Yoshida; Shuji Sato; Tetsuya Nagata
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Paper Abstract

We designed the optics supporting structure (OSS) of a 3.8 m segmented mirror telescope by applying genetic algorithm optimization. The telescope is the first segmented mirror telescope in Japan whose primary mirror consists of 18 petal shaped segment mirrors. The whole mirror is supported by 54 actuators (3 actuators per each segment). In order to realize light-weight and stiff telescope structure, we have adopted full truss structure as OSS of the telescope. We optimized its design by a newly developed software program incorporating genetic algorithm. The program automatically generates new OSS design step-by-step by optimizing the OSS parameters for realizing both light-weight structure and homologous deformation of the mirror surface supported by the OSS against the telescope elevation change simultaneously. The program successfully generated an ultra light-weight OSS design whose weight is only 8 tons including the optical elements and actuators (4 tons) with an eigen frequency of 9.5 Hz. The deviations of the 54 nodes from their original configuration of the designed OSS are less than 100 μm in the range of elevation angle 20 - 90 degrees. A real model of the OSS is under test construction. We also report the results of static test and deformation performance of this OSS model.

Paper Details

Date Published: 4 August 2010
PDF: 11 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77333E (4 August 2010); doi: 10.1117/12.856817
Show Author Affiliations
Mikio Kurita, Nagoya Univ. (Japan)
Hiroshi Ohmori, Nagoya Univ. (Japan)
Masashi Kunda, Sumitomo Mitsui Construction Co., Ltd. (Japan)
Hiroaki Kawamura, Toyota Technical Development Corp. (Japan)
Noriaki Noda, Taiyo Kogyo Corp. (Japan)
Takayuki Seki, Nishimura Co., Ltd. (Japan)
Yuji Nishimura, Nishimura Co., Ltd. (Japan)
Michitoshi Yoshida, Okayama Astronomical Observatory, National Astronomical Observatory of Japan (Japan)
Hiroshima Univ. (Japan)
Shuji Sato, Nagoya Univ. (Japan)
Tetsuya Nagata, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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