The paper considers vibration response of spinning shafts supported by flexible tilt pad journal bearings, to large mass imbalance (blade loss). A time transient study of the tilt pad journal bearing with thermal effects and without pad deformations, and with pad deformations and without thermal effects, is performed. Influence of the inclusion of thermal effects on the journal center’s orbit, the minimum film thickness, and the maximum film temperature is evaluated, and also the influence of pad deformations due to the fluid film forces on the journal center’s orbit and the minimum film thickness is studied. Inclusion of thermal effects had little effect on the orbit, while the inclusion of pad deformations had considerable effect on the journal orbit and the minimum film thickness. Three cases are studied in this paper; static load without imbalance, static load with low imbalance, and static load with high imbalance.

Issue Section:
Research Papers
Topics:
Fluid films, Journal bearings, Temperature, Transient analysis, Deformation, Temperature effects, Film thickness, Stress, Blades, Spin (Aerodynamics), Spinning (Textile), Transients (Dynamics), Vibration
1.
Allaire, P. E., Gunter, E. J., Eierman, R. G., and Nicholas, J. C., 1975, “Film Thickness in Plain Journal, Partial Arc, Axial Groove, Multilobed, Tilting Pad, and Pressure Dam Bearings-A Unified Approach,” University of Virginia Report, University of Virginia, Charlottesville, VA.
2.
Choy
F. K.
,
Braun
and M. J.
,
Hu
Y.
,
1991
, “
Nonlinear Transient and Frequency Response Analysis of a Hydrodynamic Journal Bearing
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, pp.
448
–
454
.
3.
Christie
I.
,
Griffiths
D. F.
, and
Mitchell
A. R.
,
1976
, “
The Finite Element Methods for Second Order Differential Equations with Significant First Derivations
,”
International Journal for Numerical Methods in Engineering
, Vol.
10
, pp.
1389
–
1396
.
4.
Earles
L. L.
,
Palazzolo
A. B.
, and
Armentrout
R. W.
,
1990
, “
A Finite Element Approach to Pad Flexibility Effects in Tilt Pad Journal Bearings: Parts I and II
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
112
, No.
2
, pp.
169
–
182
.
5.
Fillon
M.
,
Bligoud
J. C.
, and
Frene
J.
,
1992
, “
Experimental Study of Tilting-Pad Journal Bearings-Comparison With Theoretical Thermoelastohydrodynamic Results
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, pp.
579
–
588
.
6.
Gadangi, R. K., and Palazzolo, A. B., 1993, “Transient Analysis of Plain and Tilt Pad Journal Bearings Including Fluid Film Temperature Effects,” Presented at the ROCON’93, Somerset, NJ, Nov. 10–12.
7.
Huebner, K. H., 1981, The Finite Element Method for Engineers, Wiley, New York, NY.
8.
Kim, J., 1992, “Thermoelastohydrodynamic Tilt Pad Journal Bearing Simulation and Application to Rotor-Bearing Model,” Ph.D dissertation, Texas A&M University, College Station, TX 77843.
9.
Kim, J., and Palazzolo, A. B., 1993, “Dynamic Characteristics of TEHD Tilt Pad Journal Bearing Simulation Including Multiple Pad Flexibility Model,” Presented at the 14th ASME Biennial Conference of Noise and Vibration, Albuquerque, NM.
10.
Malik
M.
, and
Bhargava
S. K.
,
1992
, “
Transient Response Investigation of Short Journal Bearing Systems With Flexible Rotors and Damped Flexible Supports
,”
Tribology Transactions
, Vol.
35
, pp.
339
–
345
.
11.
Myrick, S. T., 1973, “Transient and Steady State Response of Flexible Rotor: Real Hydrodynamic Bearing Systems,” Ph.D. dissertation. University of Texas, Austin, TX.
12.
Palazzolo
A. B.
, and
Lin
R. R.
, et al.,
1989
, “
Active Control of Transient Rotordynamic Vibration by Optimal Control Methods
,”
ASME Journal of Engineering for Gas Turbines and Power
, Apr., Vol.
111
, pp.
264
–
270
.
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