The oil whirl and oil whip phenomena have been well known since the early twentieth century. However, there is a lot of confusion on the parameters that affect the onset of instability. In this study, we investigate the onset of instability on a flexible rotor mounted on two plain cylindrical journal bearings. The rotor is run through the first critical speed, the instability, and the second critical speed. Tests are conducted at various unbalance levels, pressures, and misalignment conditions on the coupling. It is shown that, by far, the misalignment of the coupling is the parameter that is most effective on the onset of instability. In particular angular misalignment resulted in the smoothest rotor response.
Issue Section:
Gas Turbines: Structures and Dynamics
1.
Newkirk
, B. L.
, and Taylor
, H. D.
, 1925, “Shaft Whipping Due to Oil Action in Journal Bearings
,” Gen. Electr. Rev.
0095-9480, 28
, pp. 559
–568
.2.
Guo
, Z.
, and Kirk
, R. G.
, 2003, “Instability Boundary for Rotor-Hydrodynamic Bearing Systems
,” ASME J. Vibr. Acoust.
0739-3717, 125
(4
), pp. 417
–422
.3.
Guo
, Z.
, and Kirk
, R. G.
, 2003, “Instability Boundary for Rotor-Hydrodynamic Bearing Systems, Part 2: Rotor With External Flexible Damped Support
,” ASME J. Vibr. Acoust.
0739-3717, 125
(4
), pp. 423
–426
.4.
Fuller
, D. D.
, 1983, “On the Contribution of Beauchomp Tower to Current World Technology
,” Symposium on Fluid Film Lubrication, A Century of Progress: ASLE/ASME Lubrication Conference
, Hartford, CT.
5.
Fuller
, D. D.
, 1984, Theory and Practice of Lubrication for Engineers
, 2nd ed., John Wiley & Sons
, New York
.6.
Robertson
, D.
, 1933, “Whirling of a Journal in a Sleeve Bearing
,” Philos. Mag.
0031-8086, 715
, pp. 113
–130
.7.
Hagg
, A. C.
, 1946, “The Influence of Oil-Film Journal Bearings on the Stability of Rotating Machines
,” ASME J. Appl. Mech.
0021-8936, 68
, pp. A211
–A220
.8.
Poritsky
, H.
, 1953, “Contribution to the Theory of Oil Whip
,” Trans. ASME
0097-6822, 75
, pp. 1153
–1161
.9.
Newkirk
, B. L.
, and Lewis
, J. F.
, 1956, “Oil Film Whirl-An Investigation on Disturbances Due to Oil Films in Journal Bearings
,” Trans. ASME
0097-6822, 78
, pp. 21
–27
.10.
Newkirk
, B. L.
, 1956, “Varieties of Shaft Disturbances Due to Fluid Films in Journal Bearings
,” Trans. ASME
0097-6822, 78
, pp. 985
–988
.11.
Pinkus
, O.
, 1953, “Note on Oil Whip
,” ASME J. Appl. Mech.
0021-8936, 20
, pp. 450
–451
.12.
Pinkus
, O.
, 1956, “Experimental Investigation of Resonant Whip
,” Trans. ASME
0097-6822, 78
, pp. 975
–983
.13.
Hori
, Y.
, 1959, “A Theory of Oil Whip
,” ASME J. Appl. Mech.
0021-8936, 26
, pp. 189
–198
.14.
Rieger
, N. F.
, Poritsky
, H.
, Lund
, J. W.
et al., 1965–1968, “Rotor-Bearing Dynamics Design Technology
,” 1–9
, Wright-Patterson AFB, Aero Propulsion Reports.15.
Lund
, J. W.
, and Thomsen
, K. K.
, 1978, “A Calculation Method and Data for the Dynamic Coefficients of Oil-Lubricated Journal Bearings
,” Topics in Fluid Film Bearing and Rotor Bearing System Design and Optimization, ASME Design Engineering Conference Publication
, pp. 1
–28
.16.
Lund
, J. W.
, 1974, “Stability and Damped Critical Speeds of Flexible Rotor in Fluid Film Bearings
,” Trans. ASME
0097-6822, 96
, pp. 509
–517
.17.
Muszynska
, A.
, 1986, “Whirl and Whip-Rotor/Bearing Stability Problems
,” J. Sound Vib.
0022-460X, 110
(3
), pp. 443
–462
.18.
Muszynska
, A.
, 1986, “Fluid-related Rotor/Bearing/Seal Instability Problems
,” Bently Rotor Dynamics Research Corporation Report.19.
Muszynska
, A.
, 1988, “Multi-Mode Whirl and Whip in Rotor/Bearing Systems
,” 2nd International Symposium on Transport Phenomena, Dynamics, and Design of Rotating Machinery, Honolulu, Hawaii, April 4
–6
.20.
Myers
, C. J.
, 1984, “Bifurcation Theory Applied to Oil Whirl in Plain Cylindrical Journal Bearings
,” ASME J. Appl. Mech.
0021-8936, 51
, pp. 244
–250
.21.
Hollis
, P.
, and Taylor
, D. L.
, 1986, “Hopf Bifurcation to Limit Cycles in Fluid Film Bearings
,” ASME J. Tribol.
0742-4787, 108
, pp. 184
–189
.22.
Elrod
, H. G.
, and Vijayaraghan
, D.
, 1994, “A Stability Analysis for Liquid-Lubricated Bearings Incorporating the Effects of Cavity Flow, Part I: Classical One-Dimensional Journal Bearing
,” ASME J. Tribol.
0742-4787, 116
, pp. 330
–336
.23.
Elrod
, H. G.
, and Vijayaraghan
, D.
, 1994, “A Stability Analysis for Liquid-Lubricated Bearings Incorporating the Effects of Cavity Flow, Part II: Journal Bearings with Central Groove
,” ASME J. Tribol.
0742-4787, 117
, pp. 365
–367
.24.
Crandall
, S. H.
, 1995, “The Instability Mechanism Responsible for Oil Whirl and Oil Whip
,” Proc. 4th Greek National Congress on Mechanics
, Democritus University of Thrace, Xanthi
, pp. 659
–672
.25.
Crandall
, S. H.
, 1996, “Velocity Linearization of the Dynamic Response of Fluid-Film Bearings
,” Proc. EUROMECH-2nd European Nonlinear Oscillation Conference
, Prague
, September 9–13.26.
Horattas
, G. A.
, Adams
, M. L.
, Abdel Magied
, M. F.
et al., 1997, “Experimental Investigation of Dynamic Nonlinearities in Rotating Machinery
,” Proc. ASME DETĆ 97
, Sacramento, CA
, Sept. 14–17.27.
Deepak
, S. T.
, and Noah
, S. T.
, 1998, “Experimental Verification of Subcritical Whirl Bifurcation of a Rotor Supported on a Fluid Film Bearing
,” ASME J. Tribol.
0742-4787, 120
, pp. 605
–609
.28.
Inayat-Hussain
, J. I.
, 2003, “Continuation Method Applied to Whirl Instability in Journal Bearings
,” Proc. 11th World Congress in Mechanism and Machine Science, August 18–21
, Tianjin, China
.29.
RIMAP
User Guide
, 2002, Version 1.3, RITEC, Cairo, Egypt.30.
Booser
, E. R.
, 1970, “Plain Bearing Material
,” Mach. Des.
0024-9114, 42
(15
), pp. 14
–20
.31.
Muszunska
, A.
, and Bently
, D. E.
, 1989, “Fluid Generated Instabilities of Rotors
,” ORBIT
, 10
(1
), pp. 6
–14
.32.
Kato
, T.
, Matsuoka
, H.
, and Hori
, Y.
, 1993, “Seismic Response of Linearly Stable, Misaligned Multirotor System
,” Tribol. Trans.
1040-2004, 36
(2
), pp. 311
–315
.34.
Yu
, H.
, and Adams
, M. L.
, 1989, “The Linear Model for Rotor-Dynamic Properties of Journal Bearings and Seals with combined Radial and Misalignment Motions
,” J. Sound Vib.
0022-460X, 131
(3
), pp. 367
–378
.Copyright © 2007
by American Society of Mechanical Engineers
You do not currently have access to this content.
