The present work aims to analytically study the performance of misaligned four-pocket, membrane compensated, hybrid journal bearing system operating with micropolar lubricant. In the present study, the flow characteristic of the lubricating oil containing additives and contaminants has been modeled using Erigen’s micropolar theory. The journal misalignment which may occur as a result of noncentral loading, improper assembly, shaft deflection due to elasticity and thermal distortions, etc. has been accounted for in the present study by defining a pair of misalignment parameters in vertical and horizontal directions (i.e., δ and σ).The modified Reynolds equation governing the flow of micropolar lubricant in the clearance space of a misaligned bearing has been solved using FEM and Newton Raphson method along with the appropriate boundary conditions. The numerically simulated results suggest that the effect of journal misalignment is to cause degradation in bearing performance, whereas the influence of micropolar effect of lubricant is to enhance the bearing performance. Therefore, it is imperative to account for the effect of misalignment and lubricant behavior during the design process in order to generate accurate bearing characteristics data.

References

References
1.
McKee
,
S. A.
and
McKee
,
T. R.
, 1932, “
Pressure Distribution in Oil Film of Journal Bearings
,”
Trans. ASME
,
54
, pp.
149
165
.
2.
Stokley
,
J. R.
and
Donaldson
,
R. R.
, 1969, “
Misaligned Effects in 180° Partial Journal Bearings
,”
ASLE Trans.
,
12
, pp.
216
226
.
3.
Mokhtar
,
M. O. A.
,
Safar
,
Z. S.
, and
Abd-El-Rahman
,
M. A. M.
, 1985, “
An Adiabatic Solution of Misaligned Journal Bearings
,”
ASME J. Tribol.
,
107
, pp.
263
267
.
4.
San Andrés
,
L.
1993, “
The Effect of Journal Misalignment on the Operation of a Turbulent Flow Hydrostatic Bearing
,”
ASME J. Tribol.
,
115
, pp.
355
363
.
5.
Jain
,
S. C.
,
Sharma
,
S. C.
, and
Nagaraju
,
T.
, 1997, “
Misaligned Journal Effects in Liquid Hydrostatic Non-Recessed Journal Bearings
,”
Wear
,
210
, pp.
67
75
.
6.
Basavaraj
,
J. S.
,
Sharma
,
S. C.
, and
Jain
,
S. C.
, 2010, “
A Study of Misaligned Electrorheological Fluid Lubricated Hole-Entry Hybrid Journal Bearing
,”
Tribol. Int.
,
43
, pp.
1059
1064
.
7.
Sun
,
J.
,
Deng
,
M.
,
Fu
,
Y.
, and
Gui
,
C.
, 2010, “
Thermohydrodynamic Lubrication Analysis of Misaligned Plain Journal Bearing With Rough Surface
,”
ASME J. Tribol.
,
132
, pp.
011704
.
8.
Eringen
,
A. C.
, 1966, “
Theory of Micropolar Fluids
,”
J. Math. Mech.
,
16
(
1
), pp.
1
18
.
9.
Prakash
,
J.
and
Sinha
,
P.
, 1975, “
Lubrication Theory of Micropolar Fluids and its Application to a Journal Bearing
,”
Int. J. Eng. Sci.
,
13
, pp.
217
232
.
10.
Prakash
,
J.
and
Sinha
,
P.
, 1976, “
A Study of Squeezing Flow in Micropolar Fluid Lubricated Journal Bearings
,”
Wear
,
38
, pp.
17
28
.
11.
Singh
,
C.
and
Sinha
,
P.
, 1982, “
The Three-Dimensional Reynolds Equation for Micropolar Fluid Lubricated Bearings
,”
Wear
,
76
(
2
), pp.
199
209
.
12.
Lin
,
T.-R.
, 1996, “
Hydrodynamic Lubrication of Journal Bearings Including Micropolar Lubricants and Three-Dimensional Irregularities
,”
Wear
,
192
, pp.
21
28
.
13.
Das
,
S.
,
Guha
,
S. K.
, and
Chattopadhyay
,
A. K.
, 2005, “
Linear Stability Analysis of Hydrodynamic Journal Bearings Under Micropolar Lubrication
,”
Tribol. Int.
,
38
, pp.
500
507
.
14.
Wang
,
X.-L.
, and
Zhu
,
K.-Q.
, 2006, “
Numerical Analysis of Journal Bearings Lubricated With Micropolar Fluids Including Thermal and Cavitating Effects
,”
Tribol. Int.
,
39
, pp.
227
237
.
15.
Rahmatabadi
,
A. D.
,
Nekoeimehr
,
M.
, and
Rashidi
,
R.
, 2010, “
Micropolar Lubricant Effects on the Performance of Noncircular Lobed Bearings
,”
Tribol. Int.
,
43
, pp.
404
413
.
16.
Verma
,
S.
,
Kumar
,
V.
, and
Gupta
,
K. D.
, 2009, “
Analysis of Multirecess Hydrostatic Journal Bearing Operating With Micropolar Lubricant
,”
ASME J. Tribol.
,
131
, pp.
021103
.
17.
Nicodemus
,
E. R.
and
Sharma
,
S. C.
, 2010, “
Influence of Wear on the Performance of Multirecess Hydrostatic Journal Bearing Operating With Micropolar Lubricant
,”
ASME J. Tribol.
,
132
, pp.
021703
.
18.
Nicodemus
,
E. R.
and
Sharma
,
S. C.
, 2011, “
Orifice Compensated Multirecess Hydrostatic/Hybrid Journal Bearing System of Various Geometric Shapes of Recess Operating With Micropolar Lubricant
,”
Tribol. Int.
,
44
, pp.
284
296
.
19.
DeGast
,
J. G. C.
, 1966, “
A New Type of Controlled Restrictor (M. D. R.) For Double Film Hydrostatic Bearings and Its Application to High-Precision Machine Tools
,”
Proceedings of Advances in Machine Tool Design and Research
,
Oxford, Pergamon Press
,
New York
, pp.
273
298
.
20.
Brecher
,
C.
Baum
,
C.
Winterschladen
,
M.
, and
Wenzel
,
C.
, 2007, “
Simulation of Dynamic Effects on Hydrostatic Bearings and Membrane Restrictors
,”
Prod. Eng. Res. Devel.
,
1
(
4
), pp.
415
420
.
22.
Cusano
,
C.
, 1974, “
Characteristics of Externally Pressurized Journal Bearing With Membrane-Type Variable-Flow Restrictors As Compensating Elements
,”
Inst. Mech. Eng. Lond.
,
188
(
52
), pp.
52
74
.
23.
Sharma
,
S. C.
,
Sinhasan
,
R.
, and
Jain
,
S. C.
, 1992, “
Performance Characteristics of Multirecess Hydrostatic/Hybrid Flexible Journal Bearing With Membrane Type Variable-Flow Restrictor As Compensating Device
,”
Wear
,
152
, pp.
279
300
.
24.
Phalle
,
V. M.
,
Sharma
,
S. C.
, and
Jain
,
S.C.
, 2011, “
Influence of Wear on the Performance of a 2-Lobe Multirecess Hybrid Journal Bearing System Compensated With Membrane Restrictor
,”
Tribol. Int.
,
44
, pp.
380
395
.
You do not currently have access to this content.