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TECHNICAL PAPERS

Experimental Investigation into the Instability of an Over-Hung Rigid Centrifuge Rotor Partially Filled With Fluid

[+] Author and Article Information
Zhu Changsheng

Department of Electrical Engineering, Zhejiang University, 310027, Hangzhou, Zhejiang, The People’s Republic of Chinae-mail: cszhu@hotmail.com

J. Vib. Acoust 124(4), 483-491 (Sep 20, 2002) (9 pages) doi:10.1115/1.1505027 History: Received June 01, 2001; Revised January 01, 2002; Online September 20, 2002
Copyright © 2002 by ASME
Topics: Fluids , Rotors , Whirls , Motion , Vibration
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References

Figures

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Cross-section and photograph of the rotor test rig
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Unbalance response curves of empty rotor in increasing and decreasing rotational speed operations
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Rotor motion orbit and power spectra of vibration signal while the safety bearing was working
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Unbalance response and the power spectra of vibration signal during instability developing with small fluid-fill ratio H=0.06—where 0 stands for synchronous motion in sub-critical speed region; 1 for synchronous motion near the resonant region; 2 for synchronous motion in super-critical speed region; 3 for steady synchronous motion when a sub-synchronous frequency just occurs; 4 for steady sub-synchronous motion before the rotor vibration sharply increases; 5 for nonsynchronous motion in the unstable region before the fluid free-surface break-down occurs.
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Unbalance response and the power spectra of vibration signal during instability developing with larger fluid-fill ratio H=0.41—where 0 stands for synchronous motion in sub-critical speed region; 1 for synchronous motion near the resonant region; 2 for synchronous motion in super-critical speed region; 3 for steady synchronous motion when the first sub-synchronous frequency just occurs; 4 for steady sub-synchronous motion with two sub-synchronous frequencies; 5 for nonsynchronous motion in the unstable region before the fluid free-surface break-down occurs.
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Motion orbits, power spectra and time histories of the rotor system with small fluid-fill ratio H=0.06 before (a, b and c) and after (d, e and f ) the safety bearing was working
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Whirl frequency ratio versus fluid-fill ratio H
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Instantaneous fluid free surface profile during fluid break-down
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Typical rotor orbit, power spectra and time history of vibration signal in unstable region at a speed of 515 RPM with small fluid-fill ratio H=0.06
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Rotor unstable region versus fluid-fill ratio H • determined by sudden increase in vibration amplitude; ○ determined by first occurrence of the destabilizing sub-synchronous frequency.
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Variation of rotor vibration versus fluid-fill ratio H

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