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TECHNICAL PAPERS

A Theoretical Analysis of Floating Bush Journal Bearing With Axial Oil Film Rupture Being Considered

[+] Author and Article Information
Kiyoshi Hatakenaka, Masato Tanaka, Kenji Suzuki

Department of Engineering Synthesis, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8656, Japan

J. Tribol 124(3), 494-505 (May 31, 2002) (12 pages) doi:10.1115/1.1454104 History: Received May 22, 2001; Revised July 31, 2001; Online May 31, 2002
Copyright © 2002 by ASME
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References

Shaw, M. C., and Nussdorfer, T. J., 1947, “An Analysis of the Full-Floating Journal Bearing,” NACA Report, 866.
Kettleborough,  C. F., 1954, “Frictional Experiments on Lightly-Loaded Fully Floating Journal Bearings,” Australian J. Appl. Sci., 5, pp. 211–220.
Hill,  H. C., 1958, “Slipper Bearings and Vibration Control in Small Gas Turbines,” Trans. ASME, 80, pp. 1756–1764.
Dworski,  J., 1964, “High-Speed Rotor Suspension Formed by Fully Floating Hydrodynamic Radial and Thrust Bearings,” ASME J. Eng. Power, 86, pp. 149–160.
Tondl, A., 1965, Some Problems of Rotor Dynamics, Chapman and Hall, London, pp. 200–201.
Nakagawa,  E., and Aoki,  H., 1973, “Unbalance Vibration of a Rotor-Bearing System Supported By Floating-Ring Journal Bearings,” Bull. JSME, 16, No 93, pp. 503–512.
Rohde,  S. M., and Ezzat,  H. A., 1980, “Analysis of Dynamically Loaded Floating-Ring Bearings for Automotive Application,” ASME J. Lubr. Technol., 102, pp. 271–277.
Li,  C. H., 1981, “On the Steady State and Dynamic Performance Characteristics of Floating Ring Bearings,” ASME J. Lubr. Technol., 103, pp. 389–397.
Clarke,  D. M., Fall,  C., Hayden,  G. N., and Wilkinson,  T. S., 1987, “An Analysis of the Steady-State Performance of the Cylindrical-Spherical Floating Ring Bearing,” ASME J. Tribol., 109, No. 4, pp. 704–708.
Tatara,  A., 1970, “An Experimental Study of the Stabilizing Effect of Floating-Bush Journal Bearings,” Bull. JSME, 13, No. 61, pp. 858–863.
Orcutt,  F. K., and Ng,  C. W., 1968, “Steady-State and Dynamic Properties of the Floating-Ring Journal Bearing,” ASME J. Lubr. Technol., 90, pp. 243–253.
Trippett,  R. J., 1986, “Measured and Predicted Friction in Floating-Ring Bearings,” SAE Trans., 95, pp. 1470–1476.
Trippett,  R. J., and Li,  D. F., 1984, “High-Speed Floating-Ring Bearing Test and Analysis,” ASLE Trans., 27, No. 1, pp. 73–81.
Clarke,  D. M., Fall,  C., Hayden,  G. N., and Wilkinson,  T. S., 1992, “A Steady-State Model of a Floating Ring Bearing, Including Thermal Effects,” ASME J. Tribol., 114, No. 1, pp. 141–149.
Tsuruta,  Y., and Tsuda,  K., 1985, “Investigation Into an Effect of Floating Bush Bearing, in Suppressing Oil-Whip at Higher Shaft Speed,” (in Japanese), Journal of Japanese Society of Lubrication Engineers, 30, No. 11, pp. 838–845.
Tsuda,  K., Takahashi,  T., and Tsurumaki,  N., 1985, “Observation of Oil Film Disappearance Between Shaft and Fast Rotating Bush Lubricated From Outside,” (in Japanese), Journal of Japanese Society of Lubrication Engineers, 30, No. 1, pp. 69–72.
Koeneke,  C. E., Tanaka,  M., and Motoi,  H., 1995, “Axial Oil Film Rupture in High Speed Bearings Due to the Effect of the Centrifugal Force,” ASME J. Tribol., 117, pp. 394–398.
Tanaka,  M., and Hori,  Y., 1972, “Stability Characteristics of Floating Bush Bearings,” ASME J. Lubr. Technol., 94, pp. 248–259.
Saito,  S., Someya,  T., and Nakagawa,  E., 1974, “Theoretical Investigation into the Stability of a Rotor Supported by Floating Bush Journal Bearings,” (in Japanese), Journal of the Japan Society of Mechanical Engineers, 40, No. 338, pp. 2824–2831.
Tanaka,  M., Hori,  Y., and Nasuda,  T., 1975, “A Theoretical Stability Analysis of Floating Bush Journal Bearing,” (in Japanese), Proceedings of the Japan Society of Mechanical Engineers, 750, No. 6, pp. 153–156.
Tanaka, M., 1996, “A Theoretical Analysis of Stability Characteristics of High-Speed Floating Bush Bearings,” IMechE Conference Transactions of Sixth International Conference on Vibrations in Rotating Machinery, pp. 133–142.
Frene, J., Nicolas, D., Degueurce, B., Berthe, D., and Godet, M., 1997, Hydrodynamic Lubrication—Bearings and Thrust Bearings, Elsevier, Amsterdam, pp. 154–156.

Figures

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Floating bush journal bearing in very high speed operation
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Variation of density with pressure
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Flow chart for calculating steady-state variables of inner oil film
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Flow chart for calculating equilibrium of floating bush journal bearing
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Flow chart for calculating rotordynamic coefficients of inner oil film
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Jeffcott rotor supported in floating bush journal bearings
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The variation of bush-to-shaft speed ratio with shaft speed
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The variation of driving torque on inner surface of floating bush with shaft speed
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The variation of floating bush eccentricity ratio with shaft speed
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The variation of spring coefficient KXY1 with shaft speed
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The variation of damping coefficient CXX1 with shaft speed
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Stability chart (Pin1=0.012,γ=0.15)
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Stability chart (γ=0.15)
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The variation of real and imaginary parts of eigenvalues with shaft speed (λ1=6)
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Loci of unstable whirling: (a) lower speed; and (b) higher speed.

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