Abstract

The purpose of this paper is to study the response of a tilting-pad journal bearing submitted to an unbalance load. A pseudo-time transient analysis has been developed taking into account the effective viscosity of the lubricant, the thermal expansion of bearing elements, and the elastic pad deformations. At each time interval, and for each pad, an effective temperature of the film is deduced from an energy balance. First, a comparison between theoretical results and experimental data is presented for a four-shoe tilting-pad journal bearing subjected to a static load. Second, the influence of the thermal and pad flexibility effects on the journal center orbit, on the minimum film thickness and on the maximum pressure is studied for various unbalance loads. Both the viscosity variation and the operating clearances due to elastic and thermal deformations of the bearing elements have a great influence on the behavior of the bearing.

1.
Choy
F. K.
,
Braun
M. J.
, and
Hu
Y.
,
1992
, “
Nonlinear Transient and Frequency Response Analysis of a Hydrodynamic Journal Bearing
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, No.
3
, pp.
448
454
.
2.
Desbordes
H.
,
Fillon
M.
,
Chan Hew Wai
C.
, and
Freˆne
J.
,
1993
, “
Dynamic Analysis of Tilting-Pad Journal Bearing—Influence of Pad Deformations
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
621
628
.
3.
Desbordes, H., Fillon, M., Freˆne, J., and Chan Hew Wai, C., 1994, “The Effects of Three-Dimensional Pad Deformations on Tilting-Pad Journal Bearings Under Dynamic Loading,” ASME/STLE Tribology Conference, Maui, Hawaii, Oct. 16–19, paper No. 94-Trib-46.
4.
Fillon, M., Freˆne, J., and Boncompain, R., 1985, “Etude expe´rimentale de l’effet thermique dans les paliers a` patins oscillants,” Proc. EUROTRIB’85, Vol. 1, p. 4.1.6.
5.
Fillon
M.
,
Bligoud
J. C.
, and
Freˆne
J.
,
1992
, “
Experimental Study of Tilting-Pad Journal Bearings—Comparison With Thermoelastohydrodynamic Results
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, No.
3
, pp.
579
588
.
6.
Gadangi, R. K., Palazzolo, A. B., and Kim, J., 1994, “Transient Analysis of Plain and Tilt Pad Journal Bearings Including Fluid Film Temperature Effects,” ASME/STLE Tribology Conference, Maui, Hawaii, Oct. 16–19, paper No. 94-Trib-30.
7.
Gadangi, R. K., and Palazzolo, A. B., 1994, “Transient Analysis of Tilt Pad Journal Bearings Including Effects of Pad Flexibility and Fluid Film Temperature,” ASME/STLE Tribology Conference, Maui, Hawaii, Oct. 16–19, paper No. 94-Trib-47.
8.
Malik
M.
, and
Bhargava
S. K.
,
1992
, “
Transient Response Investigations of Short Journal Bearing Systems With Flexible Rotors and Damped Flexible Pedestals
,”
STLE, Tribology Transactions
, Vol.
35
, No.
2
, pp.
339
345
.
9.
Paranjpe
R. S.
, and
Han
T.
,
1994
a, “
A Study of Thermohydrodynamic Performance of Steadily Loaded Journal Bearings
,”
STLE, Tribology Transactions
, Vol.
37
, No.
4
, pp.
679
690
.
10.
Paranjpe, R. S., and Han, T., 1994b, “A Transient Thermohydrodynamic Analysis Including Mass Conserving Cavitation for Dynamically Loaded Journal Bearings,” ASME/STLE Tribology Conference, Maui, Hawaii, Oct. 16–19, paper No. 94-Trib-36.
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