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TECHNICAL PAPERS

Hydrodynamic Analysis of Compliant Foil Bearings With Compressible Air Flow

[+] Author and Article Information
Z.-C. Peng, M. M. Khonsari

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

J. Tribol 126(3), 542-546 (Jun 28, 2004) (5 pages) doi:10.1115/1.1739242 History: Received April 23, 2003; Revised September 11, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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References

Heshmat,  H., Shapiro,  W., and Gray,  S., 1982, “Development of Foil Journal Bearings for High Load Capacity and High-Speed Whirl Stability,” ASME J. Lubr. Technol., 104(2), pp. 149–156.
Heshmat,  H., 1994, “Advancements in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capacity,” ASME J. Tribol., 116, pp. 287–295.
Heshmat,  H., Walowit,  J. A., and Pinkus,  O., 1983, “Analysis of Gas-Lubricated Foil Journal Bearings,” ASME J. Lubr. Technol., 105, pp. 647–655.
DellaCorte,  C., and Valco,  M. J., 2000, “Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbo-Machinery Applications,” Tribol. Trans., 43(4), pp. 795–801.
Radil,  K., Howard,  S., and Dykas,  B., 2002, “The Role of Radial Clearance on the Performance of Foil Air Bearings,” Tribol. Trans., 45(4), pp. 485–490.
Faria,  M. T., and San Andres,  L., 2000, “On the Numerical Modeling of High-Speed Hydrodynamic Gas Bearing,” Transactions of the ASME,122, pp. 124–130.
Ku,  C.-P. R., and Heshmat,  H., 1992, “Compliant Foil Bearing Structural Stiffness Analysis: Part I—Theoretical Modal Including Strip and Variable Bump Foil Geometry,” ASME J. Tribol., 114, pp. 394–400.
Heshmat,  H., and Ku,  C.-P. R., 1994, “Structural Damping of Self-Acting Compliant Foil Journal Bearings,” ASME J. Tribol., 116, pp. 76–82.
Peng,  J.-P., and Carpino,  M., 1993, “Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings,” Transactions of the ASME,115, pp. 20–27.
Heshmat,  C. A. , 2000, “Analysis of Gas Lubricated Foil Thrust Bearings Using Coupled Finite Element and Finite Difference Methods,” ASME J. Tribol., 122, pp. 199–204.
Heshmat,  H., Walowit,  J. A., and Pinkus,  O., 1983, “Analysis of Gas-Lubricated Compliant Thrust Bearings,” ASME J. Lubr. Technol., 105, pp. 638–646.
Khonsari, M., and Booser, E., 2001, Applied Tribology, John Wiley & Sons, Inc.
Strom, T., 1987, Program Manager, Advanced Gas Turbine (AGT) Technology Development Project-Final Report, NASA CR-180891.

Figures

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Schematics of a foil bearing
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The compliant support of a foil bearing
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Hydrodynamic pressure of a “1st generation” bearing at 45,000 rpm under 210 N. (θ is reversed to show the sub-ambient pressure.)
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Simulated load performance of a “1st generation” bearing compared with experimental data
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Converged film thickness (operating speed=30,000 rpm, hmin=10.5 μm) of a “1st generation” bearing
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The mid-plane pressure of a “1st generation” foil bearing compared with that of a rigid bearing
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Increasing film thickness with increasing speeds for a given minimum film thickness
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The predicted pressure of a “3rd generation” foil bearing at 29,700 rpm (C=40 μm and hmin=6 μm). The corresponding load matches the experimental load of 282 N 2.
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Comparison of attitude angles between rigid bearing and foil bearing

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