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.
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