Abstract
Hybrid bearings integrating an external pressurizing source are widely used in high-speed turbomachinery due to their notable advantages, including low friction and wear, enhanced reliability and durability, and accurate rotor positioning, as well as large static stiffness and load carry capacity even lubricated with low viscosity liquids. This paper reports experimental data and predictions to identify the characteristics of pneumatic hammer of hybrid gas bearings, 60 mm in diameter, with increasing feed gas pressures. Pneumatic hammer characteristics with static load stiffnesses and flow rates of the test bearing are recorded for increasing static loads with various shaft center positions. A computational program for modeling of hybrid gas bearings predicts static load characteristics of the test bearings. Predictions show a remarkable agreement with measurements. Comparisons of measurements and predictions reveal that calculated reduced damping factors and damping coefficients of hybrid bearings, relying on volume ratio between recess and fluid film, are reliable indicators to estimate the onset condition of pneumatic hammer instability.
Issue Section:
Research Papers
References
1.
Rohde
,
S. M.
, and
Ezzat
,
H. A.
, 1976
, “
On the Dynamic Behavior of Hybrid Journal Bearings
,” ASME J. Lubr. Technol.
,
98
(1
), pp. 90
–94
.10.1115/1.34527882.
San Andrés
,
L.
, 2006
, “
Hybrid Flexure Pivot-Tilting Pad Gas Bearings: Analysis and Experimental Validation
,” ASME J. Tribol.
,
128
(3
), pp. 551
–558
.10.1115/1.21949183.
San Andrés
,
L.
,
Childs
,
D.
, and
Yang
,
Z.
, 1995
, “
Turbulent-Flow Hydrostatic Bearings: Analysis and Experimental Results
,” Int. J. Mech. Sci.
,
37
(8
), pp. 815
–829
.10.1016/0020-7403(94)00104-R4.
Pelfrey
,
P. C.
, and
Sishtla
,
V. M.
, 1996
, “
Investigation of Hydrostatic Bearings Operating in a Turbulent, Compressible Liquid
,” AIAA
Paper No. 1996-3103.10.2514/6.1996-31035.
Wilcock
,
D. F.
, 1967
, “
Externally Pressurized Bearings as Servomechanisms. I-the Simple Thrust Bearing
,” ASME J. Lubr. Technol.
,
89
(4
), pp. 418
–424
.10.1115/1.36170156.
Davies
,
P. B.
, 1969
, “
A General Analysis of Multi-Recess Hydrostatic Journal Bearings
,” Proceedings of the Institution of Mechanical Engineers
, 184(1), pp. 827
–838
.10.1243/PIME_PROC_1969_184_060_027.
Ghosh
,
M. K.
, and
Viswanath
,
N. S.
, 1987
, “
Recess Volume Fluid Compressibility Effect on the Dynamic Characteristics of Multirecess Hydrostatic Journal Bearings With Journal Rotation
,” ASME J. Tribol.
,
109
(3
), pp. 417
–426
.10.1115/1.32614628.
Lund
,
J. W.
, 1967
, “
A Theoretical Analysis of Whirl Instability and Pneumatic Hammer for a Rigid Rotor in Pressurized Gas Journal Bearings
,” ASME J. Lubr. Technol.
,
89
(2
), pp. 154
–165
.10.1115/1.36169339.
Talukder
,
H. M.
, and
Stowell
,
T. B.
, 2003
, “
Pneumatic Hammer in an Externally Pressurized Orifice-Compensated Air Journal Bearing
,” Tribol. Int.
,
36
(8
), pp. 585
–591
.10.1016/S0301-679X(02)00247-510.
Chen
,
X. D.
, and
He
,
X. M.
, 2006
, “
The Effect of the Recess Shape on Performance Analysis of the Gas-Lubricated Bearing in Optical Lithography
,” Tribol. Int.
,
39
(11
), pp. 1336
–1341
.10.1016/j.triboint.2005.10.00511.
San Andrés
,
L.
, 1991
, “
Effects of Fluid Compressibility on the Dynamic Response of Hydrostatic Journal Bearings
,” Wear
,
146
, pp. 269
–283
.10.1016/0043-1648(91)90068-612.
Roblee
,
J. W.
, 1985
, “
Design of Externally Pressurized Gas Bearings for Dynamic Applications
,” Ph.D. dissertation,
University of California
,
Berkley, CA
.13.
Roblee
,
J. W.
, and
Mote
,
C. D.
, 1990
, “
Design of Externally Pressurized Gas Bearings for Stiffness and Damping
,” Tribol. Int.
,
23
(5
), pp. 333
–345
.10.1016/0301-679X(90)90007-C14.
Arghir
,
M.
,
Hassini
,
M. A.
,
Balducchi
,
F.
, and
Gauthier
,
R.
, 2016
, “
Synthesis of Experimental and Theoretical Analysis of Pneumatic Hammer Instability in an Aerostatic Bearing
,” ASME J. Eng. Gas Turbines Power
,
138
(2
), p. 021602
.10.1115/1.403132215.
Hassini
,
M. A.
,
Arghir
,
M.
, and
Frocot
,
M.
, 2012
, “
Comparison Between Numerical and Experimental Dynamic Coefficients of a Hybrid Aerostatic Bearing
,” ASME J. Eng. Gas Turbines Power
,
134
(12
), p. 122506
.10.1115/1.400737516.
Zheng
,
Y.
,
Yang
,
G.
,
Cui
,
H.
, and
Hou
,
Y.
, 2020
, “
Pneumatic Stability Analysis of Single-Pad Aerostatic Thrust Bearing With Pocketed Orifice
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
234
(12
), pp. 1857
–1866
.10.1177/135065011989416817.
San Andrés
,
L.
, and
Zhu
,
X.
, 2003
, “
Experimental Response of a Rotor Supported on Flexure Pivot Hydrostatic Pad Gas Bearings
,” Turbomachinery Research Consortium, Report No. TRC-B&C-4-03
.https://rotorlab.tamu.edu/T RIBGROUP/TRC%2002-12%20reports/2003%20Zhu-San%20Andres-Experimental%20Response%20of%20a%20Rotor%20Supported%20on%20Flexure%20Pivot%20Hydrostatic%20Pad%20Gas%20Bearings.pdf18.
San Andrés
,
L. A.
, 1992
, “
Analysis of Hydrostatic Journal Bearings With End Seals
,” ASME J. Tribol.
,
114
(4
), pp. 755
–764
.10.1115/1.292094519.
San Andrés
,
L.
, and
Wilde
,
D.
, 2001
, “
Finite Element Analysis of Gas Bearings for Oil-Free Turbomachinery
,” Rev. Eur., Elém. Finis
,
10
(6–7
), pp. 769
–790
.10.1080/12506559.2001.973757020.
Gao
,
S.
,
Cheng
,
K.
,
Chen
,
S.
,
Ding
,
H.
, and
Fu
,
H.
, 2017
, “
Computational Design and Analysis of Aerostatic Journal Bearings With Application to Ultra-High Speed Spindles
,” Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science
, 231(7), pp. 1205
–1220
.10.1177/095440621663934421.
Rowe
,
W.
, 1980
, “
Dynamic and Static Properties of Recessed Hydrostatic Journal Bearings by Small Displacement Analysis
,” ASME J. Lubr. Technol.
,
102
(1
), pp. 71
–79
.10.1115/1.325144122.
Belforte
,
G.
,
Raparelli
,
T.
,
Viktorov
,
V.
, and
Trivella
,
A.
, 2007
, “
Discharge Coefficients of Orifice-Type Restrictor for Aerostatic Bearings
,” Tribol. Int.
,
40
(3
), pp. 512
–521
.10.1016/j.triboint.2006.05.003Copyright © 2022 by ASME
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