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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Experimental Response of Simple Gas Hybrid Bearings for Oil-Free Turbomachinery

[+] Author and Article Information
Deborah A. Osborne

Honeywell International, Aerospace/Engineering & Technology, 2525 W. 190th Street, Torrance, CA 90504-6099e-mail: deborah.osborne@honeywell.com

Luis San Andrés

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123e-mail: lsanandres@mengr.tamu.edu

J. Eng. Gas Turbines Power 128(3), 626-633 (Jun 13, 2006) (8 pages) doi:10.1115/1.1839922 History: Received October 01, 2002; Revised March 01, 2003; Online June 13, 2006
Copyright © 2006 by ASME
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References

Figures

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Cross section view of test rig: rotor supported on three lobe gas bearings
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Test rotor supported on three lobe test bearings showing eddy current sensors and infrared tachometer
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Geometry of the three lobe test bearing showing preload and feedholes
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Waterfall plot of rotor coastdown response at the right vertical eddy current sensor. Supply pressure ratio equal to 5.08 and remnant imbalance.
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Synchronous response of rotor supported on gas bearings (remnant imbalance). Measurements at the right vertical eddy current sensor for increasing supply pressure ratios.
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Bearing forces from coastdown response to remnant imbalance. Measurements at 120 deg clockwise from vertical for increasing supply pressure ratios. Inset shows location of load cells.
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Damping ratios for increasing supply pressure at three eddy current sensor locations
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Waterfall plot of rotor run up response to remnant imbalance at right vertical eddy current sensor with pressure ratio equal to 3.72
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Threshold speeds of instability and natural frequencies determined from speed run up tests conducted on rotor supported by three lobe gas bearings
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Whirl frequency ratio determined from speed run up tests for rotor supported on three lobe gas bearings

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