Control of Self-Excited Vibration of a Rotor System With Active Gas Bearings

[+] Author and Article Information
Jinhao Qiu, Junji Tani, Taekyu Kwon

Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan

J. Vib. Acoust 125(3), 328-334 (Jun 18, 2003) (7 pages) doi:10.1115/1.1576423 History: Received March 01, 2002; Revised March 01, 2003; Online June 18, 2003
Copyright © 2003 by ASME
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Configuration of the rotor-bearing system
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Configuration of the high-expansion-ratio expander (a) Longitudinal cross-section (b) Transverse cross-section
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Configuration of the tilting-pad journal gas bearings
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Configuration of the externally-pressurized thrust gas bearings (a) Distribution of nozzles (b) Upper and lower clearances
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Waterfall chart of the frequency response of the rotor at the LL gap sensor (experimental result)
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Bias displacement of the shaft versus DC voltage applied to the UR actuator  
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Schematic diagram of the active control system
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Block diagram of the control system
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Power spectra of the shaft at the LR sensor position (Rotation speed: 10,000 rpm, PID gain: Kp of UL act.=10,Kp of UR act.=10)  
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Power spectra of the shaft at different sensor positions (Rotation speed: 11,600 rpm, PID gain: Kp of UL act.=150,Kp of UR act.=100) (a) UL sensor position (b) LL sensor position (c) UR sensor position (d) LR sensor position
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Power spectra of the shaft at the UL sensor position (Rotation speed: 11,600 rpm, PID gain: Kp of UL act.=200,Kp of UR act.=200)
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Power spectra of the shaft at the UR sensor position (Rotation speed: 11,600 rpm, (a) PID control: Kd of UL Act.=0.2,Kp of UL act.=10, (b) Kd of UR act.=0.01,Kp of UR act.=10)




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