Abstract

To compensate for an extremely heavy journal, jacking pockets can be added to the surface of pads in fluid film bearings. Jacking pockets can range in size and shape and will have an influence on the hydrodynamic performance of the bearing. Computational fluid dynamics (CFD) was used to better understand the influence of the geometry of a rectangular/stadium-shaped, jacking pocket on the performance of bearings. First, the influence of the pocket depth on the pressure profile of the bearing was investigated. A varying profile occurred with jacking pocket depths less than 6.6 × Cb. After this threshold, the pocket depth ceased to have an influence on the pressure profile. A second study examined the circumferential length of the pocket, and the pressure profile was found to approach the smooth case as the pocket circumferential length decreased. Response surface models were created to map the influence of the jacking pocket geometry on the journal location in the bearing, power loss, and stiffness characteristics of the bearing. This is the first study on influence of the geometry of a jacking pocket on the operation and linear stiffnesses of the bearing in fluid film journal bearings.

Issue Section:
Hydrodynamic Lubrication
Keywords:
bearing design and technology, bearings, films, fluid film lubrication, hydrodynamic lubrication, hydrostatic lubrication, journal bearings
Topics:
Bearings, Computational fluid dynamics, Fluid films, Journal bearings, Pressure, Geometry, Stiffness, Regression models

References

1.
San Andres
,
L.
,
1990
, “
Turbulent Hybrid Bearings With Fluid Inertia Effects
,”
ASME J. Tribol.
,
112
(
4
), pp.
699
–
707
. 10.1115/1.2920318
Google Scholar
Crossref
Search ADS
 
2.
Constantinescu
,
V.
, and
Galetuse
,
S.
,
1976
, “
Pressure Drop Due to Inertia Forces in Step Bearings
,”
ASME J. Lubr. Tech.
,
98
(
1
), pp.
167
–
174
. 10.1115/1.3452757
Google Scholar
Crossref
Search ADS
 
3.
Braun
,
M.
,
Choy
,
F.
, and
Zhou
,
Y.
,
1993
, “
The Effects of a Hydrostatic Pocket Aspect Ratio, Supply Orifice Position, and Attack Angle on Steady-State Flow Patterns, Pressure, and Shear Characteristics
,”
ASME J. Tribol.
,
115
(
4
), pp.
678
–
685
. 10.1115/1.2921693
Google Scholar
Crossref
Search ADS
 
4.
Helene
,
M.
,
Arghir
,
M.
, and
Frene
,
J.
,
2003
, “
Numerical Study of the Pressure Pattern in a Two-Dimensional Hybrid Journal Bearing Recess, Laminar, and Turbulent Flow Results
,”
Trans. Am. Soc. Mech. Eng. J. Tribol.
,
125
(
2
), pp.
283
–
290
. 10.1115/1.1537233
5.
Helene
,
M.
,
Arghir
,
M.
, and
Frene
,
J.
,
2003
, “
Numerical Three-Dimensional Pressure Patterns in a Recess of a Turbulent and Compressible Hybrid Journal Bearing
,”
Trans. Am. Soc. Mech. Eng. J. Tribol.
,
125
(
2
), pp.
301
–
308
. 10.1115/1.1506327
6.
Liang
,
P.
,
Lu
,
C.
,
Pan
,
W.
, and
Li
,
S.
,
2014
, “
A New Method for Calculating the Static Performance of Hydrostatic Journal Bearing
,”
Tribol. Int.
,
77
(
1
), pp.
72
–
77
. 10.1016/j.triboint.2014.04.019
Google Scholar
Crossref
Search ADS
 
7.
Johnson
,
R. E.
, and
Manring
,
N. D.
,
2008
, “
Sensitivity Studies for the Shallow-Pocket Geometry of a Hydrostatic Thrust Bearing
,”
In ASME 2003 International Mechanical Engineering Congress and Exposition
,
American Society of Mechanical Engineers Digital Collection
, pp.
231
–
238
. 10.1115/IMECE2003-43265
8.
Kumar
,
E. V.
,
Phalle
,
V. M.
,
Sharma
,
S. C.
, and
Jain
,
S.
,
2009
, “
Analysis of a Worn Multirecess Hydrostatic Journal Bearing System
,”
ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
,
San Diego, CA
,
Aug. 30–Sept. 2
, pp.
1089
–
1095
.
9.
Dufrane
,
K.
,
Kannel
,
J.
, and
McCloskey
,
T.
,
1983
, “
Wear of Steam Turbine Journal Bearings at Low Operating Speeds
,”
ASME J. Lubr. Tech.
,
105
(
3
), pp.
313
–
317
. 10.1115/1.3254599
Google Scholar
Crossref
Search ADS
 
10.
Wordsworth
,
R.
, and
Ettles
,
C.
,
1975
, “
The Effect of Jacking Pockets in Hydrodynamic Thrust Pads
,”
Wear
,
31
(
1
), pp.
167
–
171
. 10.1016/0043-1648(75)90129-5
Google Scholar
Crossref
Search ADS
 
11.
Heinrichson
,
N.
, and
Santos
,
I.
,
2006
, “On the Design of Tilting-Pad Thrust Bearings,”
Department of Mechanical Engineering, Institut for Mekanisk Teknologi, Technical University of Denmark
,
Lyngby, Denmark
.
12.
Heinrichson
,
N.
,
Santos
,
I. F.
, and
Fuerst
,
A.
,
2007
, “
The Influence of Injection Pockets on the Performance of Tilting-Pad Thrust Bearings—Part I: Theory
,”
ASME J. Tribol.
,
129
(
4
), pp.
895
–
903
. 10.1115/1.2768609
Google Scholar
Crossref
Search ADS
 
13.
Heinrichson
,
N.
,
Fuerst
,
A.
, and
Santos
,
I. F.
,
2007
, “
The Influence of Injection Pockets on the Performance of Tilting-Pad Thrust Bearings–Part II: Comparison Between Theory and Experiment
,”
ASME J. Tribol.
,
129
(
4
), pp.
904
–
912
. 10.1115/1.2768610
Google Scholar
Crossref
Search ADS
 
14.
Fillon
,
M.
,
Wodtke
,
M.
, and
Wasilczuk
,
M.
,
2015
, “
Effect of Presence of Lifting Pocket on the Thd Performance of a Large Tilting-Pad Thrust Bearing
,”
Friction
,
3
(
4
), pp.
266
–
274
. 10.1007/s40544-015-0092-4
Google Scholar
Crossref
Search ADS
 
15.
Wodtke
,
M.
,
Fillon
,
M.
,
Schubert
,
A.
, and
Wasilczuk
,
M.
,
2013
, “
Study of the Influence of Heat Convection Coefficient on Predicted Performance of a Large Tilting-Pad Thrust Bearing
,”
ASME J. Tribol.
,
135
(
2
), p.
021702
. 10.1115/1.4023086
Google Scholar
Crossref
Search ADS
 
16.
Wodtke
,
M.
,
Schubert
,
A.
,
Fillon
,
M.
,
Wasilczuk
,
M.
, and
Paja¸czkowski
,
P.
,
2014
, “
Large Hydrodynamic Thrust Bearing: Comparison of the Calculations and Measurements
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
228
(
9
), pp.
974
–
983
. 10.1177/1350650114528317
Google Scholar
Crossref
Search ADS
 
17.
Fitzgerald
,
M.
, and
Neal
,
P.
,
1992
, “
Temperature Distributions and Heat Transfer in Journal Bearings
,”
ASME J. Tribol.
,
114
(
1
), pp.
122
–
130
. 10.1115/1.2920850
Google Scholar
Crossref
Search ADS
 
18.
He
,
M.
,
2003
, “
Thermoelastohydrodynamic Analysis of Fluid Film Journal Bearings
,” Ph.D. thesis,
University of Virginia
,
Charlottesville, VA
.
19.
Dousti
,
S.
,
2014
, “
An Extended Reynolds Equation Development With Applications to Fixed Geometry Bearings and Squeeze Film Dampers
,” Ph.D. thesis,
University of Virginia
,
Charlottesville, VA
.
20.
Nassab
,
G. S.
,
2005
, “
Inertia Effect on the Thermohydrodynamic Characteristics of Journal Bearings
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
219
(
6
), pp.
459
–
467
. 10.1243/135065005X33946
Google Scholar
Crossref
Search ADS
 
21.
Braun
,
M.
, and
Hannon
,
W.
,
2010
, “
Cavitation Formation and Modelling for Fluid Film Bearings: A Review
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
224
(
9
), pp.
839
–
863
. 10.1243/13506501JET772
Google Scholar
Crossref
Search ADS
 
22.
Branagan
,
L.
,
2006
, “
Toward a Quantitative Analysis of Journal and Bearing Scratches
,”
In Proceedings of the 5th EDF & LMS Poitiers Workshop: Bearing Behavior under Unusual Operating Conditions
,
Futuroscope, France
,
Oct. 5
.
23.
Box
,
G. E.
,
Hunter
,
J. S.
, and
Hunter
,
W. G.
,
2005
,
Statistics for Experimenters: Design, Innovation, and Discovery
, Vol.
2
,
Wiley-Interscience
,
New York
.
24.
Gao
,
F.
, and
Han
,
L.
,
2012
, “
Implementing the Nelder-Mead Simplex Algorithm With Adaptive Parameters
,”
Comput. Optim. Appl.
,
51
(
1
), pp.
259
–
277
. 10.1007/s10589-010-9329-3
Google Scholar
Crossref
Search ADS
 
25.
Kleinbaum
,
D.
,
Kupper
,
L.
,
Nizam
,
A.
, and
Rosenberg
,
E.
,
2013
,
Applied Regression Analysis and Other Multivariable Methods
,
Nelson Education
,
Toronto, ON, Canada
.
26.
He
,
M.
,
Cloud
,
C. H.
,
Byrne
,
J. M.
, and
Vázquez
,
J. A.
,
2016
, “
Fundamentals of Fluid Film Journal Bearing Operation and Modeling
,”
Asia Turbomachinery & Pump Symposium, 2016 Proceedings
,
Singapore
,
Feb. 22–25
, pp.
154
–
175
.
Copyright © 2019 by ASME
You do not currently have access to this content.