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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

Gross,  W. A., 1969, “A Review of Developments in Externally Pressurized Gas Bearing Technology Since 1959,” J. Lubr. Technol., 91, pp. 161–165.
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Chen, H. M., Howarth, R., Geren, B. et al., 2001, “Application of Foil Bearings to Helium Turbocompressor,” Proc. 30th Turbomachinery Symposium, Houston, TX, pp. 103–114.
San Andrés,  L., and Vance,  J., 2001, “Feasibility Study on Alternative Oil-Less Bearing Technologies for Automotive Turbochargers,” Final Research Progress Report, Texas A&M University, College Station, TX.
Garner,  D. R., Lee,  C. S., and Martin,  F. A., 1980, “Stability of Profile Bore Bearings: Influence of Bearing Type Selection,” Tribol. Int., 13, pp. 204–210.
Fuller,  D. D., 1969, “A Review of the State-of-the-Art for the Design of Self-Acting Gas-Lubricated Bearings,” J. Lubr. Technol., 91, pp. 1–16.
Shapiro,  W., 1969, “Steady-State and Dynamic Analyses of Gas-Lubricated Hybrid Journal Bearings,” J. Lubr. Technol., 91, pp. 171–180.
Lund,  J. W., 1964, “The Hydrostatic Gas Journal Bearing With Journal Rotation and Vibration,” J. Basic Eng., 86, pp. 328–336.
Lund,  J. W., 1967, “A Theoretical Analysis of Whirl Instability and Pneumatic Hammer for a Rigid Rotor in Pressurized Gas Journal Bearings,” ASME J. Lubr. Technol., 89, pp. 154–166.
Zhang,  R. Q., and Chang,  H. S., 1995, “A New Type of Hydrostatic/Hydrodynamic Gas Journal Bearing and Its Optimization for Maximum Stability,” Tribol. Trans., 38, pp. 589–594.
Jing,  G., Zhang,  P., and Hu,  Z. Y., 1997, “On Fundamental Characteristics of a Hybrid Gas-Lubricated Journal Bearing With Surface-Restriction Compensation,” Tribol. Trans., 40, pp. 528–536.
Greenhill, L. M., and Lease, V. J., 2001, “Hydrostatic Pivoted Pad Bearings for Oil-Free Turbomachinery,” Proc. ISCORMA Conference, Lake Tahoe, CA, No. 3005.
Piekos,  E. S., and Breuer,  K. S., 1999, “Pseudospectral Orbit Simulation of Nonideal Gas-Lubricated Journal Bearings for Microfabricated Turbomachines,” ASME J. Tribol., 121, pp. 604–609.
Piekos, E. S., 2000, “Numerical Simulation of Gas-Lubricated Journal Bearings for Microfabricated Machines,” Ph.D. thesis, Massachusetts Institute of Technology, Cambridge, MA.
Fréchette, L. G., Nagle, S. F. et al., 2001, “An Electrostatic Induction Micromotor Supported on Gas-Lubricated Bearings,” Proc. 4th IEEE International Micro Electro Mechanical Systems Conference, MEMS 2001, Interlaken, Switzerland.
San Andrés,  L., and Wilde,  D. A., 2001, “Finite Element Analysis of Gas Bearings for Oil-Free Turbomachinery,” Revue Européenne des Eléments Finis,10, pp. 769–790.
Wilde, D. A., and San Andrés, L., 2003, “Comparison of Rotordynamic Analysis Predictions With the Test Response of Simple Gas Hybrid Bearings for Oil Free Turbomachinery,” ASME Paper No. 2003-GT-38859.
Dı́az,  S., and San Andrés,  L., 1999, “High Speed Test Rig for Identification of Gas Journal Bearing Performance: Design, Constraints, and Fabrications,” The Turbomachinery Laboratory, Texas A&M University, College Station, TX, Report No. TRC-RD-1-99.
Wilde, D. A., 2002, “Experimental Response of Gas Hybrid Bearings for High Speed Oil-Free Turbomachinery,” Masters thesis, Texas A&M University, College Station, TX.

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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