A new modified Reynolds equation is derived with centrifugal force acting on the hydrodynamic oil film being considered. This equation, together with a cavitation model, is used to obtain the steady-state equilibrium and calculate the rotordynamic coefficients of lightly loaded floating bush journal bearings operating at very high shaft speeds. The bush-to-shaft speed ratio and the linear cross-coupling spring coefficients of the inner oil film is found to decrease with the increase in shaft speed as the axial oil film rupture develops in the inner oil film. The present model can give reasonable explanation to the steady-state behavior and the stability behavior of the bearing observed in actual machines.
Issue Section:
Technical Papers
1.
Shaw, M. C., and Nussdorfer, T. J., 1947, “An Analysis of the Full-Floating Journal Bearing,” NACA Report, 866.
2.
Kettleborough
, C. F.
, 1954
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,” Australian J. Appl. Sci.
, 5
, pp. 211
–220
.3.
Hill
, H. C.
, 1958
, “Slipper Bearings and Vibration Control in Small Gas Turbines
,” Trans. ASME
, 80
, pp. 1756
–1764
.4.
Dworski
, J.
, 1964
, “High-Speed Rotor Suspension Formed by Fully Floating Hydrodynamic Radial and Thrust Bearings
,” ASME J. Eng. Power
, 86
, pp. 149
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.5.
Tondl, A., 1965, Some Problems of Rotor Dynamics, Chapman and Hall, London, pp. 200–201.
6.
Nakagawa
, E.
, and Aoki
, H.
, 1973
, “Unbalance Vibration of a Rotor-Bearing System Supported By Floating-Ring Journal Bearings
,” Bull. JSME
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.7.
Rohde
, S. M.
, and Ezzat
, H. A.
, 1980
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,” ASME J. Lubr. Technol.
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, pp. 271
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.8.
Li
, C. H.
, 1981
, “On the Steady State and Dynamic Performance Characteristics of Floating Ring Bearings
,” ASME J. Lubr. Technol.
, 103
, pp. 389
–397
.9.
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.
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, pp. 704
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.10.
Tatara
, A.
, 1970
, “An Experimental Study of the Stabilizing Effect of Floating-Bush Journal Bearings
,” Bull. JSME
, 13
, No. 61
, pp. 858
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.11.
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
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.12.
Trippett
, R. J.
, 1986
, “Measured and Predicted Friction in Floating-Ring Bearings
,” SAE Trans.
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.13.
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, and Li
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, 1984
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,” ASLE Trans.
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Clarke
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, Fall
, C.
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,” ASME J. Tribol.
, 114
, No. 1
, pp. 141
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.15.
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
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–845
.16.
Tsuda
, K.
, Takahashi
, T.
, and Tsurumaki
, N.
, 1985
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,” (in Japanese), Journal of Japanese Society of Lubrication Engineers
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.17.
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
.18.
Tanaka
, M.
, and Hori
, Y.
, 1972
, “Stability Characteristics of Floating Bush Bearings
,” ASME J. Lubr. Technol.
, 94
, pp. 248
–259
.19.
Saito
, S.
, Someya
, T.
, and Nakagawa
, E.
, 1974
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,” (in Japanese), Journal of the Japan Society of Mechanical Engineers
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, No. 338
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.20.
Tanaka
, M.
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, 1975
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), Proceedings of the Japan Society of Mechanical Engineers
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.21.
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.
22.
Frene, J., Nicolas, D., Degueurce, B., Berthe, D., and Godet, M., 1997, Hydrodynamic Lubrication—Bearings and Thrust Bearings, Elsevier, Amsterdam, pp. 154–156.
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