As described in Part I (Wilkes et al., 2012, “Improving Tilting-Pad Journal Bearing Predictions—Part I: Model Development and Impact of Rotor Excited Versus Bearing Excited Impedance Coefficients,” ASME J. Eng. Gas Turb. Power, 135(1), p. 012503), most analytical models for tilting-pad journal bearing (TPJBs) are based on the assumption that explicit dependence on pad motion can be eliminated by assuming harmonic rotor motion such that the amplitude and phase of pad motions resulting from radial and transverse rotor motions are predicted by rotor-pad transfer functions. In short, these transfer functions specify the amplitude and phase of pad motion (angular, radial, translational, etc.) in response to an input rotor motion. Direct measurements of pad motion during test excitation were recorded to produce measured transfer functions between rotor and pad motion, and a comparison between these measurements and predictions is given. Motion probes were added to the loaded pad (having the static load vector directed through its pivot) of a 5-pad TPJB to obtain accurate measurement of pad radial and tangential motion, as well as tilt, yaw, and pitch. Strain gauges were attached to the side of the loaded pad to measure static and dynamic bending strains, which were then used to determine static and dynamic changes in pad curvature (pad clearance).

References

References
1.
Adams
,
M.
, and
Payandeh
,
S.
,
1983
, “
Self-Excited Vibration of Statically Unloaded Pads in Tilting-Pad Journal Bearings
,”
ASME J. Lubr. Technol.
,
105
, pp.
377
384
.10.1115/1.3254616
2.
Sabnavis
,
G
.,
2005
, “
Test Results for Shaft Tracking Behavior of Pads in a Spherical Pivot Type Tilting Pad Journal Bearing
,” M.S. thesis,
Virginia Polytechnic Institute and State University
,
Blacksburg, VA
.
3.
Wilkes
,
J
.,
2011
, “
Measured and Predicted Transfer Functions Between Rotor Motion and Pad Motion for a Rocker-Back Tilting-Pad Bearing in LOP Configuration
,” Proc. of ASME Turbo Expo 2011,
Vancouver
,
Canada
, June 6–10,
ASME
Paper No. GT2011-46510. 10.1115/GT2011-46510
4.
Lund
,
J. W.
,
1964
, “
Spring and Damping Coefficients for the Tilting-Pad Journal Bearing
,”
ASLE Trans.
,
7
, pp.
342
352
.10.1080/05698196408972064
5.
Nilsson
,
L.
,
1978
, “
The Influence of Bearing Flexibility on the Dynamic Performance of Radial Oil Film Bearings
,”
Proc. 5th Leeds-Lyon Symposium on Tribology, Lyon, France
, September 19–22,
Mechanical Engineering Publications
,
London
, Vol. 5, pp.
311
319
.
6.
Lund
,
J. W.
, and
Pedersen
,
L. B.
,
1987
, “
The Influence of Pad Flexibility on the Dynamic Coefficients of a Tilting Pad Journal Bearing
,”
ASME J. Tribol.
,
109
(
1
), pp.
65
70
.10.1115/1.3261329
7.
Wilkes
,
J.
, and
Childs
,
D.
,
2012
, “
Improving Tilting-Pad Journal Bearing Predictions—Part I: Model Development and Impact of Rotor Excited Versus Bearing Excited Impedance Coefficients
,”
ASME J. Eng. Gas Turb. Power
,
135
(
1
), p. 012503.
8.
Rodriguez
,
L.
, and
Childs
,
D.
,
2006
, “
Frequency Dependency of Measured and Predicted Rotordynamic Coefficients for Load-on-Pad Flexible-Pivot Tilting-Pad Bearing
,”
ASME J. Tribol.
,
128
(
2
), pp.
388
395
.10.1115/1.2162552
9.
Carter
,
C.
, and
Childs
,
D.
,
2008
Measurements Versus Predictions for the Rotordynamic Characteristics of a 5-Pad, Rocker-Pivot, Tilting-Pad Bearing in Load Between Pad Configuration
,” Proc. of ASME Turbo Expo 2008,
Berlin, Germany
, June 9–13,
ASME
Paper No. GT2008-50069.10.1115/GT2008-50069
10.
Harris
,
J.
, and
Childs
,
D.
,
2008
, “
Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-In-Socket Tilting Pad Journal Bearing
,”
Proc. of ASME Turbo Expo 2008
,
Berlin, Germany
, June 9–13,
ASME
Paper No. GT2008-50063.10.1115/GT2008-50063
11.
Kulhanek
,
C
.,
2010
, “
Dynamic and Static Characteristics of a Rocker-Pivot, Tilting-Pad Bearing with 50% and 60% Offsets
,” M.S. thesis,
Texas A&M University
,
College Station, TX
.
12.
Wilkes
,
J
.,
2011
, “
Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing
,” Ph.D. dissertation,
Texas A&M University
,
College Station, TX
.
13.
Glienicke
,
J.
,
1966
, “
Experimental Investigation of Stiffness and Damping Coefficients of Turbine Bearings and Their Application to Instability Predictions
,”
Proc. of the International Mech. E.
, Vol. 181(
3B
), pp.
116
129
.
14.
Deeg
,
E
.,
1992
, “
New Algorithms for Calculating Hertzian Stresses, Deformations, and Contact Zone Parameters
,”
AMP J. Tech.
,
2
, pp.
14
24
, available at: http://www.te.com/documentation/whitepapers/pdf/2jot_2.pdf
15.
Wilkes
,
J.
, and
Childs
,
D.
,
2012
, “
Tilting-Pad Journal Bearings—A Discussion on Stability Calculation, Frequency Dependence, and Pad and Pivot Flexibility
,”
Proc. of ASME Turbo Expo 2012
,
Copenhagen
,
Denmark
, June 11–15, Paper No. GT2012-69809.
16.
Szeri
,
A.
,
1980
,
Tribology: Friction, Lubrication, and Wear
,
McGraw-Hill
,
New York
.
17.
Kim
,
J.
,
Palazzolo
,
A.
, and
Gadangi
,
R.
,
1995
, “
Dynamic Characteristics of TEHD Tilt Pad Journal Bearing Simulation Including Multiple Mode Pad Flexibility Model
,”
ASME J. Vibr. Acoust.
,
117
(
1
), pp.
123
135
.10.1115/1.2873856
18.
Varela
,
A.
, and
Santos
,
I.
,
2011
, “
Stability Analysis of an Industrial Gas Compressor Supported by Tilting-Pad Bearings Under Different Lubrication Regimes
,” Proc. ASME Turbo Expo 2011,
Vancouver
,
Canada
, June 6–10,
ASME
Paper No. GT2011-46450.10.1115/GT2011-46450
19.
Dimond
,
T.
,
Younan
,
A.
, and
Allaire
,
P.
,
2011
, “
A Review of Tilting Pad Bearing Theory
,”
Int. J. Rotating. Mach.
,
2011
, p.
908469
. 10.1155/2011/908469
You do not currently have access to this content.