This paper studies the static and dynamic coefficients of an externally pressurized porous gas journal bearing. The finite difference method is used to solve the Reynolds equation of the bearing to obtain the static load capacity. The linear perturbation method is adopted to derive the perturbation equations considering four degrees-of-freedom (4DOF), namely, the translational movements in x and y directions and the rotational movements around x and y directions. The effects of various parameters on the dynamic behaviors of the journal bearing are studied. These parameters include the bearing number, the supply pressure, the feeding parameter, the length-to-diameter ratio, the porosity parameter, the eccentricity ratio, and tilting angles. Simulated results prove that the proposed method is valid in estimating the static and dynamic characteristics of a porous gas journal bearing with 4DOF.
Issue Section:
Hydrodynamic Lubrication
References
1.
Sneck
, H. J.
, and Yen
, K. T.
, 1964
, “The Externally Pressurized Porous Wall Gas-Lubricated Journal Bearing—Ι
,” ASLE Trans.
, 7
(3
), pp. 288
–298
.2.
Sneck
, H. J.
, and Elwell
, R. C.
, 1965
, “The Externally Pressurized Porous Wall Gas-Lubricated Journal Bearing—ΙΙ
,” ASLE Trans.
, 8
(4
), pp. 339
–345
.3.
Sun
, D. C.
, 1975
, “Analysis of the Steady State Characteristics of Gas-Lubricated Porous Journal Bearings
,” ASME J. Lubr. Technol.
, 97
(1
), pp. 44
–51
.4.
Majumdar
, B. C.
, 1975
, “Analysis of Externally Pressurized Porous Gas Journal Bearings—Ι
,” Wear
, 33
(1
), pp. 25
–35
.5.
Rao
, N. S.
, 1982
, “Analysis of Aerostatic Porous Journal Bearings Using the Slip Velocity Boundary Conditions
,” Wear
, 76
(1
), pp. 35
–47
.6.
Kwan
, Y. B. K.
, and Corbett
, J.
, 1998
, “Porous Aerostatic Bearings: An Updated Review
,” Wear
, 222
(2
), pp. 69
–73
.7.
Lee
, C. C.
, and You
, H. I.
, 2009
, “Characteristics of Externally Pressurized Porous Gas Bearings Considering Structure Permeability
,” STLE Tribol. Trans.
, 52
(6
), pp. 768
–776
.8.
Lee
, C. C.
, and You
, H. I.
, 2010
, “Geometrical Design Considerations on Externally Pressurized Porous Gas Bearings
,” Tribol. Trans.
, 53
(3
), pp. 386
–391
.9.
Saha
, N.
, and Majumdar
, B. C.
, 2002
, “Study of Externally-Pressurized Gas-Lubricated Two-Layered Porous Journal Bearings: A Steady State Analysis
,” Proc. Inst. Mech. Eng., Part J
, 216
(3
), pp. 151
–158
.10.
Yoshimoto
, S.
, Tozuka
, H.
, and Dambara
, S.
, 2003
, “Static Characteristics of Aerostatic Porous Journal Bearings With a Surface-Restricted Layer
,” Proc. Inst. Mech. Eng., Part J
, 217
(2
), pp. 125
–132
.11.
Rao
, N. S.
, 1977
, “Analysis of the Stiffness and Damping Characteristics of an Externally Pressurized Porous Gas Journal Bearing
,” ASME J. Lubr. Technol.
, 99
(2
), pp. 295
–301
.12.
Rao
, N. S.
, and Majumdar
, B. C.
, 1978
, “Dynamic Characteristics of Gas-Lubricated Externally Pressurized Porous Bearings With Journal Rotation—Ι
,” Wear
, 50
(1
), pp. 59
–70
.13.
Rao
, N. S.
, and Majumdar
, B. C.
, 1978
, “Dynamic Characteristics of Gas-Lubricated Externally Pressurized Porous Bearings With Journal Rotation—ΙΙ
,” Wear
, 50
(2
), pp. 201
–210
.14.
Rao
, N. S.
, and Majumdar
, B. C.
, 1978
, “Dynamic Stiffness and Damping Coefficients of Aerostatic, Porous, Journal Bearings
,” J. Mech. Eng. Sci.
, 20
(5
), pp. 291
–296
.15.
Pal
, D. K.
, and Majumdar
, B. C.
, 1984
, “Stability Analysis of Externally-Pressurized Gas-Lubricated Porous Bearings With Journal Rotation—Part 1: Cylindrical Whirl
,” Tribol. Int.
, 17
(2
), pp. 83
–91
.16.
Lin
, J. R.
, and Hwang
, C. C.
, 1993
, “Lubrication of Short Porous Journal Bearings: Use of the Brinkman-Extended Darcy Model
,” Wear
, 161
(1
), pp. 93
–104
.17.
Naduvinamani
, N. B.
, Hiremath
, P. S.
, and Gurubasavaraj
, G.
, 2001
, “Squeeze Film Lubrication of a Short Porous Journal Bearing With Couple Stress Fluid
,” Tribol. Int.
, 34
(11
), pp. 739
–747
.18.
Naduvinamani
, N. B.
, Hiremath
, P. S.
, and Gurubasavaraj
, G.
, 2001
, “Static and Dynamic Behavior of Squeeze-Film Lubrication of Narrow Porous Journal Bearings With Coupled Stress Fluid
,” Proc. Inst. Mech. Eng., Part J
, 215
(1
), pp. 45
–62
.19.
Elsharkawy
, A. A.
, and Guedouar
, L. H.
, 2001
, “Hydrodynamic Lubrication of Porous Journal Bearings Using a Modified Brinkman-Extended Darcy Model
,” Tribol. Int.
, 34
(11
), pp. 767
–777
.20.
Scheidegger
, A. E.
, 1957
, The Physics of Flow Through Porous Media
, University of Toronto Press
, Toronto, ON, Canada
.21.
Mori
, H.
, Yabe
, H.
, and Shibayama
, T.
, 1965
, “Theoretical Solution as a Boundary Value Problem for Externally Pressurized Porous Gas Bearing
,” ASME J. Basic Eng.
, 87
(3
), pp. 622
–630
.22.
Xu
, C. D., and Jiang, S. Y., 2015
, “Dynamic Analysis of a Motorized Spindle With Externally Pressurized Air Bearings
,” ASME J. Vib. Acoust.
, 137
(4
), p. 041001
.23.
Jang
, G. H.
, and Kim
, Y. J.
, 1999
, “Calculation of Dynamic Coefficients in a Hydrodynamic Bearing Considering Five Degrees of Freedom for a General Rotor-Bearing System
,” ASME J. Tribol.
, 121
(3
), pp. 499
–505
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