The journal equation of motion and the complete Reynolds equation of compressible fluid film are numerically solved and a computer program is developed. The formulas are for externally pressurized bearings, but results are shown only for self-acting bearings. For certain cases, the validity of the theoretical results is verified by comparison with the experimental data available from the literature. Through intensive use of the program, journal center trajectories are obtained and effects of fluid inertia are investigated. New stability parameters are presented and stability diagrams are established for bearings with L/D = 0.25, 0.5, 1, 1.5, and 2. The rotor unbalance effects on bearing stability limits are illustrated for several cases.
Issue Section:
Research Papers
1.
Akers
A.
Michaelson
S.
Cameron
A.
1971
, “Stability Contours for a Whirling Finite Journal Bearing
,” ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol. 93
, No. l
, pp. 177
–190
.2.
Akkok
M.
McC. Ettles
C. M.
1980
, “The Effect of Grooving and Bore Shape on the Stability of Journal Bearings
,” ASLE Transaction
, Vol. 23
, No. 4
, pp. 431
–441
.3.
Ausman
J. S.
1961
, “An Improved Analytical Solution for Self-Acting, Gas Lubricated Journal Bearings of Finite Length
,” ASME Journal of Basic Engineering
, Vol. 83
, No. 2
, pp. 188
–194
.4.
Ausman
J. S.
1963
, “Linearised ph Stability Theory for Translatory Half-Speed Whirl of Long, Self-Acting Gas-Lubricated Journal Bearings
,” ASME Journal of Basic Engineering
, Vol. 85
, No. 4
, pp. 611
–619
.5.
Cantaloube, A., and Boudet, R., 1997, “Determination of the dynamic characteristics of an aerostatic journal bearing under hybrid conditions,” Acts of National Congress AIMETA, Siena, Italy, pp. 261–266.
6.
Cheng
H. S.
Pan
C. H.
1965
, “Stability Analysis of Gas-Lubricated, Self-Acting, Plain, Cylindrical, Journal Bearings of Finite Length, Using Galerkin’s Method
,” ASME Journal of Basic Engineering
, Vol. 87
, No. 1
, pp. 185
–192
.7.
Constantinescu, V. N., Nica, A., Pascovici, M. D., Ceptureanu, G., and Nedelcu, S., 1985, Sliding Bearings, Allerton Press, Inc., New York.
8.
Elrod
H. G.
McCabe
J. T.
Chu
T. Y.
1967
, “Determination of Gas-Bearing Stability by Response to a Step-Jump
,” ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol. 89
, No. 4
, pp. 493
–489
.9.
Grassam, N. S., and Powell, J. W., 1964, Gas Lubricated Bearings, Butterworths, London.
10.
Gross, W. A., et al., 1980, Fluid Film Lubrication, Wiley, New York.
11.
ISO 6358, 1989, Pneumatic Fluid Power. Components Using Compressible Fluids. Determination of Flow Rate Characteristics.
12.
Kazimierski
Z.
Brzeski
L.
Hogodko
L.
1992
, “Gas Bearing of Infinite Stiffness
,” ASME JOURNAL OF TRIBOLOGY
, Vol. 114
, No. 2
, pp. 270
–273
.13.
Lee, Chong-Won, 1993, Vibration Analysis of Rotors, (Solid Mechanics and its Applications: Vol. 21), Kluwer Academic Publishers.
14.
Peyret, R., and Taylor, T. D., 1983, Computational Methods for Fluid Flow, Springer-Verlag, New York.
15.
Pincus, O., and Sternlicht, B., 1961, Theory of Hydrodynamic Lubrication, McGraw-Hill, New York.
16.
Ramesh
J.
Majumdar
B. C.
1995
, “Stability of Rough Journal Bearings Using Nonlinear Transient Method
,” ASME JOURNAL OF TRIBOLOGY
, Vol. 117
, No. 4
, pp. 691
–695
.17.
Sternlicht
B.
Winn
L. W.
1963
, “On the Load Capacity and Stability of Rotor in Self-Acting Gas Lubricated Plain Cylindrical Journal Bearings
,” ASME Journal of Basic Engineering
, Vol. 85
, No. 4
, pp. 503
–512
.18.
Tieu
A. K.
Qiu
Z. L.
1995
, “Stability of Finite Journal Bearings—from Linear and Nonlinear Bearing Forces
,” Tribology Transactions
, Vol. 38
, No. 3
, pp. 627
–635
.
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