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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Comparison of Rotordynamic Analysis Predictions With the Test 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), 634-643 (Jun 13, 2006) (10 pages) doi:10.1115/1.1839923 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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Schematic view of test three lobe hybrid gas bearing
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Geometry of feed orifice in gas hybrid bearing
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Empirical loss coefficient versus supply pressure at feed orifice curtain area
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Predicted journal eccentricity and attitude angle versus rotor speed with feed pressure ratio increasing
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Predicted gas bearing direct stiffnesses (Kxx=Kyy) versus frequency ratio for feed pressure ratio=5.08 and three rotor speeds
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Predicted gas bearing cross-coupled stiffnesses (Kxy=Kyx) versus frequency ratio for feed pressure ratio=5.08 and three rotor speeds
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Predicted gas bearing direct damping coefficients (Cxx=Cyy) versus frequency ratio for feed pressure ratio=5.08 and three rotor speeds
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Predicted gas bearing cross-coupled damping coefficient (Cyx=Cxy) versus frequency ratio for feed pressure ratio=5.08 and three rotor speeds
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Geometric model of test rotor
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Measured and predicted first free-free mode shape of test rotor
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Measured and predicted second free-free mode shape of test rotor
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Predicted (peak-to-peak) imbalance response for rotor supported on gas bearings for synchronous bearing force coefficients and increasing supply pressure ratios
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Measured and predicted critical speeds for rotor supported on gas bearings (supply pressure ratio varies)
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Experimental damping ratios from synchronous rotor response and predicted (conical and cylindrical modes) damping ratios for rotor supported on gas bearings

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