TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

On the Performance of Hybrid Foil-Magnetic Bearings

[+] Author and Article Information
H. Heshmat, H. Ming Chen, J. F. Walton

Mohawk Innovative Technology, Inc., 1037 Watervliet-Shaker Road, Albany, NY 12205

J. Eng. Gas Turbines Power 122(1), 73-81 (Oct 20, 1999) (9 pages) doi:10.1115/1.483178 History: Received March 22, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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Heshmat, H., and Hermel, P., 1992, “Compliant Foil Bearing Technology and Their Application to High Speed Turbomachinery,” Proceedings, 19th Leeds-Lyon Symposium on Thin Film in Tribology—From Micro Meters to Nano Meters, Leeds, U.K., Sept. 1992.
Heshmat, H., 1993, “Advancements In The Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capability,” ASME Paper 93-Trib-32.
Walton, J. F., and Heshmat, H., 1994, “Compliant Foil Bearings For Use In Cryogenic Turbopumps,” NASA CP3282 Vol. 1, Sept. 19, pp. 372–381.
Heshmat,  H., and Ku,  C-P. R., 1994, “Structural Damping of Self-Acting Compliant Foil Journal Bearings,” ASME J. Tribol., 116, No. 1, pp. 76–82.
Ku, C-P. R., and Heshmat, H., 1993, “Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings: Theoretical Consideration,” STLE Annual Meeting, Calgary, Canada, May 17–20.
Heshmat,  H., Walowit,  J., and Pinkus,  O., 1983, “Analysis of Gas-Lubricated Compliant Journal Bearings,” ASME J. Lubr. Technol. Trans., 105, No. 4, pp. 647–655.
Heshmat, H., 1991, “Analysis of Compliant Foil Bearings with Spatially Variable Stiffness,” Paper No. AIAA-91-2102.
Heshmat, C. A., and Heshmat, H., 1994, “An Analysis of Gas Lubricated, Multi-Leaf Foil Journal Bearings With Backing Springs,” ASME Paper 94-Trib-61.
Ehrich,  F. F., 1969, “The Dynamic Stability of Rotor/Stator Radial Rubs in Rotating Machinery,” ASME J. Eng. Ind., 91, pp. 1025–1028.
Chen, H. M., 1988, “Magnetic Bearings and Flexible Rotor Dynamics,” STLE Annual Meeting at Cleveland, Ohio, May 9–12.
Chen, H. M., 1988, “Active Magnetic Bearing Design Methodology—A Conventional Rotordynamics Approach,” presented at the 15th Leeds-Lyon Symposium on Tribology, Sept. 6–9, 1988, at Leeds, UK.
Chen, H. M., Wilson, D., Lewis, P., and Hurley, J., 1990, “Stability Analysis for Rotors Supported by Active Magnetic Bearings,” presented at the 2nd International Magnetic Bearing Symposium, Japan, July 12–16.
Chen, H. M., and Ku, C. P., 1991, “Virtual Balancing of Rotors Supported by Magnetic Bearings,” presented at the 13th Biennial ASME Conference on Mechanical Vibration & Noise, Sept. 22–25, 1991, Miami, Florida.
Schweitzer, G., et al., 1994, Active Magnetic Bearings, vdf Hochschulverlag AG an der ETH, Zurich.
Dirusso, E., Brown, G. V., and Provenza, A. J., 1994, “Test of a Cryogenic Electromagnet Biased Homopolar Magnetic Bearing,” Advanced Earth-to-Orbit Technology, R. J. Richmond and S. T. Wu, eds., NASA, CP-3282, Vol. II, pp. 385–394.
Chen, H. M., 1995, “Design and Analysis of a Sensorless Magnetic Damper,” ASME Paper 95-GT-180.


Grahic Jump Location
Schematic of hybrid foil magnetic bearing concept
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Foil bearing assembly and nomenclature
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Foil bump strip configuration and nomenclature
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Program flow chart including top foil influence
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Film thickness, deflection, and pressure
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Pressure profile applied to top foil
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Top smooth foil influence factors
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Location of minimum film thickness
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Load capacity versus eccentricity ratio
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Stiffness Kxx versus eccentricity ratio
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Stiffness Kyx versus eccentricity ratio
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Stiffness Kxy versus eccentricity ratio
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Stiffness Kyy versus eccentricity ratio
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Hybrid foil/magnetic bearing coordinate system
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Hybrid bearing stiffness
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Foil-magnetic bearing natural frequencies adjusting the PID gains



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