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Proceedings Paper

Experimental study on the damping of FAST cabin suspension system
Author(s): Hui Li; Jing-hai Sun; Xin-yu Zhang; Wen-bai Zhu; Gao-feng Pan; Qing-ge Yang
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Paper Abstract

The focus cabin suspension of the FAST telescope has structurally weak-stiffness dynamics with low damping performance, which makes it quite sensitive to wind-induced vibrations. A reasonable estimation about the damping is very important for the control performance evaluation of the prototype. It is a quite difficult task as the telescope is no at available yet. In the paper, a preliminary analysis is first made on the aerodynamic damping. Then a series of experimental models are tested for measuring the total damping. The scales of these models range from 10m to 50m in diameter while 6 test parameters are specially designed to check the damping sensitivity. The Ibrahim time domain (ITD) method is employed to identify the damping from the measured cabin response. The identification results indicate that the lowest damping ratio of the models is about 0.2%~0.4%. Friction-type cabin-cable joint seems to have main influence on the system damping.

Paper Details

Date Published: 17 September 2012
PDF: 15 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84445Y (17 September 2012); doi: 10.1117/12.930996
Show Author Affiliations
Hui Li, National Astronomical Observatories (China)
Jing-hai Sun, National Astronomical Observatories (China)
Xin-yu Zhang, National Astronomical Observatories (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Wen-bai Zhu, National Astronomical Observatories (China)
Gao-feng Pan, National Astronomical Observatories (China)
Qing-ge Yang, National Astronomical Observatories (China)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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