Experimental study on the damping of FAST cabin suspension system

Hui Li; Jing-hai Sun; Xin-yu Zhang; Wen-bai Zhu; Gao-feng Pan; Qing-ge Yang

doi:10.1117/12.930996

17 September 2012 Experimental study on the damping of FAST cabin suspension system

Hui Li, Jing-hai Sun, Xin-yu Zhang, Wen-bai Zhu, Gao-feng Pan, Qing-ge Yang

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 84445Y (2012) https://doi.org/10.1117/12.930996
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Hui Li, Jing-hai Sun, Xin-yu Zhang, Wen-bai Zhu, Gao-feng Pan, and Qing-ge Yang "Experimental study on the damping of FAST cabin suspension system", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84445Y (17 September 2012); https://doi.org/10.1117/12.930996

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available