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TECHNICAL PAPERS

Modeling and Identification of Gas Journal Bearings: Self-Acting Gas Bearing Results

[+] Author and Article Information
G. Belforte, T. Raparelli, V. Viktorov

Department of Mechanics, Politecnico di Torino, C.so Duca degli Abruzzi, 24, 10129 Torino, Italy

J. Tribol 124(4), 716-724 (Sep 24, 2002) (9 pages) doi:10.1115/1.1472458 History: Received July 31, 2001; Revised February 05, 2002; Online September 24, 2002
Copyright © 2002 by ASME
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References

Pan,  C. H., and Sternlicht,  B., 1962, “On the Translatory Whirl Motion of a Vertical Rotor in Plain Cylindrical Gas-Dynamic Journal Bearings,” ASME J. Basic Eng., 84(1), pp. 152–158.
Rentzepis,  G. M., and Sternlicht,  B., 1962, “On the Stability of Rotor in Cylindrical Journal Bearings,” ASME J. Basic Eng., 84(3), pp. 521–532.
Ausman,  J. S., 1963, “Linearized ph Stability Theory for Translatory Half-Speed Whirl of Long, Self-Acting Gas-Lubricated Journal Bearings,” ASME J. Basic Eng., 85(4), pp. 611–619.
Castelli,  V., and Elrod,  H. G., 1965, “Solution of the Stability Problem for 360 Deg Self-Acting, Gas-Lubricated Bearings,” ASME J. Basic Eng., 87(1), pp. 199–212.
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(2), pp. 154–163.
Fleming,  D. P., Cunningham,  R. E., and Anderson,  W. J., 1970, “Zero-Load Stability of Rotating Externally Pressurized Gas-Lubricated Journal Bearings,” ASME J. Lubr. Technol., 92(2), pp. 325–335.
Kazimierski,  Z., and Jarzecki,  K., 1979, “Stability Threshold of Flexibly Supported Hybrid Gas Bearings,” ASME J. Lubr. Technol., 101(4), pp. 451–457.
Belforte,  G., Raparelli,  T., and Viktorov,  V., 1999, “Theoretical Investigations of Fluid Inertia Effects and Stability of Self-Acting Gas Journal Bearings,” ASME J. Tribol., 121(4), pp. 836–843.
Lund,  J. W., 1968, “Calculation of Stiffness and Damping Properties of Gas Bearings,” ASME J. Lubr. Technol., 90(4), pp. 793–803.
Lund,  J. W., 1976, “Linear Transient Response of a Flexible Rotor Supported in Gas-Lubricated Bearings,” ASME J. Lubr. Technol., 98(1), pp. 57–65.
Czolczynski, K., 1999, Rotordynamics of Gas-Lubricated Journal Bearing Systems, (Mechanical Engineering Series), Springer-Verlag New York.
Gross, W. A., 1962, Gas Film Lubrication, Wiley & Sons, New York.
Constantinescu, V. N., Nica, A., Pascovici, M. D., Ceptureanu, G., and Nedelcu, S., 1985, Sliding Bearings, Allerton Press, Inc., New York.
Goodwin, M. J., 1989, Dynamic of Rotor-Bearing Systems, Unwin Hyman, London.
ISO 6538, 1989, “Pneumatic Fluid Power. Components Using Compressible Fluids. Determination of Flow-Rate Characteristics.”

Figures

Grahic Jump Location
Schematic diagram of the center plane of the journal bearing with the coordinate system
Grahic Jump Location
Dimensionless static stiffnesses K̄=ΔF̄/Δȳ of self-acting bearings with ka=0.5 and Δȳ=0.1
Grahic Jump Location
Attitude angles β of self-acting bearings with ka=0.5 and Δȳ=0.1
Grahic Jump Location
Dimensionless static stiffnesses K̄ of self-acting bearings with ka=0.4 and Δȳ=0.1
Grahic Jump Location
Attitude angles β of self-acting bearings with ka=0.4 and Δȳ=0.1
Grahic Jump Location
Cross-coupled amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2 and kh=0.85 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Direct amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2 and kh=0.85 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Cross-coupled amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85 and khd=1.05 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Direct amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85 and khd=1.05 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Cross-coupled amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Direct amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=5.27, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Cross-coupled amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=1.05, L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Direct amplitude and phase frequency characteristics of self-acting gas journal bearings with Λ=1.05,L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Cross-coupled dimensionless stiffness and damping coefficient of self-acting gas journal bearings with Λ=84.3,L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)
Grahic Jump Location
Direct dimensionless stiffness and damping coefficient of self-acting gas journal bearings with Λ=84.3,L/D=0.5 and L/D=4,ka=0.4,kθ=0.75,kL=π/2,kh=0.85,khd=1.05 and kLd=1.35 (continuous lines: analytical model, dashed lines: numerical model)

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