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A magnetic bearing exciter is attached to the rotor-bearing system, to exert an asynchronously rotating force on the rotor to excite the first forward mode. And the half-power point method is developed on the basis of displacement response function, where displacement response data is needed only to identify the frequency and damping. The simulation results show that the method can effectively identify the damping with speed and white noise interference. The experiment results show that the damping radio decreases with increasing rotational speed. It has a good engineering application prospects.

Identification of Damping Ratio for a Rotor-Bearing System Using a Magnetic Bearing Exciter