Abstract

Analytical expressions for the hydrodynamic forces, and four related dynamic coefficients, are presented for finite length squeeze film dampers (SFDs) executing combined radial and tangential motion around the bearing center, with small amplitude. Previous analyses by Mulcahy (1980) and San Andres and Vance (1987) are shown to be particular cases of the present treatment. The influence of combined motion on the coefficients is found to differ, in several respects, from that which can be deduced from results for one dimensional radial motion and circular centred orbital motion. The effects of combined motion on the mean flow velocity and the wall stress are also studied. The study provides further insight into the validity of bulk flow assumptions, often used when dealing with lubrication problems where fluid inertia effects are significant.

Issue Section:
Research Papers
Topics:
Bearings, Dampers, Flow (Dynamics), Fluid-dynamic forces, Fluids, Inertia (Mechanics), Lubrication, Stress
1.
Braun
M. J.
, and
Hendricks
R. C.
,
1984
, “
An Experimental Investigation of the Vaporous/Gaseous Cavity Characteristics of an Eccentric Journal Bearing
,”
ASLE Transactions
, Vol.
27
, No.
1
, pp.
1
–
14
.
2.
El-Shafei, A., and Crandall, S. H., 1991, “Fluid Inertia Forces In Squeeze Film Dampers,” Rotating Machinery Dynamics, ASME Publication, DE-Vol. 35, pp. 219–228.
3.
Launder
B. E.
, and
Leschziner
M.
,
1978
, “
Flow in Finite-Width, Thrust Bearings Including Inertia Effects: Part I-Laminar Flow
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
100
, pp.
330
–
338
.
4.
Mulcahy
T. M.
,
1980
, “
Fluid Forces on Rods Vibrating in Finite Length Annular Regions
,”
ASME Journal of Applied Mechanics
, Vol.
47
, No.
2
, pp.
234
–
240
.
5.
Modest
M. F.
, and
Tichy
J. A.
,
1978
, “
Squeeze Film Flow in Arbitrarily Shaped Journal Bearings Subject to Oscillations
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
100
, pp.
323
–
329
.
6.
Ramli
M. D.
,
Roberts
J. B.
, and
Ellis
J.
,
1987
, “
Determination of Squeeze-Film Dynamic Coefficients from Experimental Transient Data
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
109
, No.
1
, pp.
155
–
163
.
7.
Rouch
K. E.
,
1990
, “
Experimental Evaluation of Squeeze Film Damper Coefficients with Frequency Domain Techniques
,”
STLE Tribology Transactions
, Vol.
33
, No.
1
, pp.
67
–
75
.
8.
San Andres
L.
, and
Vance
J. M.
,
1986
, “
Effects of Fluid Inertia and Turbulence on the Force Coefficients for Squeeze Film Dampers
,”
ASME Journal of Engineering For Gas Turbines and Power
, Vol.
108
, No.
2
, pp.
332
–
339
.
9.
San Andres
L. A.
, and
Vance
J. M.
,
1987
, “
Effect of Fluid Inertia on Squeeze Film Damper Force for Small Amplitude Circular Centred Motions
,”
ASLE Transactions
, Vol.
30
, No.
1
, pp.
63
–
68
.
10.
Szeri
A. Z.
,
Raimondi
A. A.
, and
Giron-Duarte
A.
,
1983
, “
Linear Force Coefficients for Squeeze-Film Dampers
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
105
, pp.
326
–
334
.
11.
Tichy
J. A.
,
1982
, “
Effects of Fluid Inertia and Viscoelasticity on Squeeze-Film Bearing Forces
,”
ASLE Transactions
, Vol.
25
, No.
1
, pp.
125
–
132
.
12.
Tichy
J. A.
,
1984
, “
Effect of Fluid Inertia and Viscoelasticity on the One-Dimensional Bearing
,”
ASLE Transactions
, Vol.
27
, No.
2
, pp.
164
–
167
.
13.
Tichy
J. A.
, and
Bou-said
B.
,
1991
, “
Hydrodynamic Lubrication and Bearing Behaviour with Impulsive Loads
,”
ASLE Tribology Transactions
, Vol.
34
, No.
4
, pp.
505
–
512
.
14.
Zhang
J.
,
Ellis
J.
, and
Roberts
J. B.
,
1993
, “
Observations on The Nonlinear Fluid Forces in Short Cylindrical Squeeze Film Dampers
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
115
, No.
4
, pp.
692
–
698
.
15.
Zhang
J.
,
Roberts
J. B.
, and
Ellis
J.
,
1994
, “
Experimental Fluid Dynamic Force Coefficients For a Short Cylindrical Squeeze Film Damper Executing Circular Centred Orbits
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, No.
3
, pp.
528
–
534
.
16.
Zhang
J. X.
, and
Roberts
J. B.
,
1994
, “
Identification of Non-linear Force Coefficients for the Radial Motion of a Squeeze Film Damper
,”
Proceedings of the Institution of Mechanical Engineers, Part J, JOURNAL OF ENGINEERING TRIBOLOGY
, Vol.
208
, No.
4
, pp.
235
–
245
.
This content is only available via PDF.
Copyright © 1996
 by The American Society of Mechanical Engineers
You do not currently have access to this content.