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Proceedings Paper

Vibration properties of hard x-ray telescope on board satellite
Author(s): Tatsuro Kosaka; Takeyuki Igarashi; Hisamitsu Awaki; Keiji Ogi; Keitaro Itoh; Yoshitomo Maeda; Manabu Ichida; Akihiro Furuzawa; Takuya Miyazawa; Hideyo Kunieda
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Paper Abstract

ASTRO-H is the new Japanese X-ray astronomy satellite for launch in 2013. HXT on board the satellite has a mirror housing which is a cylindrical case and contains reflection mirror foils, which are constrained by alignment bars. In order to investigate vibration properties of HXT on board the satellite, vibration tests and FEM analyses were conducted. From the results of x-vibration test, it was found that there were no resonant frequencies at frequency less than 120 Hz. It also appeared that foils move along grooves of alignment bars when the housing was vibrated because kinetic connection between foils and alignment bars is only friction force. From the simulated results, this loose connection used in the actual HXT housing is useful to suppress a strong resonance at 51Hz predicted by supposing tight connections such as adhesiveness. As for z-vibration properties, vibration property of the housing was complicated since foils leap when zacceleration becomes larger than 1G. However it could be confirmed that the distinct resonant peaks did not appear at frequency less than 200 Hz. From these results, it was found that HXT housing had not any resonant frequencies less than 120 Hz, which is the maximum frequency of sinusoidal vibrations applied when launched.

Paper Details

Date Published: 29 July 2010
PDF: 9 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323G (29 July 2010); doi: 10.1117/12.856846
Show Author Affiliations
Tatsuro Kosaka, Kochi Univ. of Technology (Japan)
Takeyuki Igarashi, Osaka City Univ. (Japan)
Hisamitsu Awaki, Ehime Univ. (Japan)
Keiji Ogi, Ehime Univ. (Japan)
Keitaro Itoh, Ehime Univ. (Japan)
Yoshitomo Maeda, Japan Aerospace Exploration Agency (Japan)
Manabu Ichida, Japan Aerospace Exploration Agency (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Takuya Miyazawa, Nagoya Univ. (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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