The Morton effect (ME) is characterized by an asymmetric journal temperature distribution, slowly varying thermal bow and intolerable synchronous vibration levels. The conventional mass imbalance model is replaced by a more accurate thermal shaft bow model. Rotor permanent bow and disk skew are synchronous excitation sources and are incorporated in the dynamic model to investigate their influence on the ME. A hybrid beam/solid element finite element shaft model is utilized to provide improved accuracy for predicting the rotor thermal bow and expansion, with practical computation time. ME is shown to be induced by initial shaft bow and disk skew. The conventional mass imbalance approach is shown to have some limitations.
Issue Section:
Hydrodynamic Lubrication
References
1.
Keogh
, P.
, and Morton
, P.
, 1993
, “Journal Bearing Differential Heating Evaluation With Influence on Rotor Dynamic Behavior
,” Proc. R. Soc. London, Ser. A
, 441
(1913
), pp. 527
–548
.2.
Keogh
, P.
, and Morton
, P.
, 1994
, “Dynamic Nature of Rotor Thermal Bending Due to Unsteady Lubricant Shearing Within a Bearing
,” Proc. R. Soc. London, Ser. A
, 445
(1924
), pp. 273
–290
.3.
Gomiciaga
, R.
, and Keogh
, P.
, 1999
, “Orbit Induced Journal Temperature Variation in Hydrodynamic Bearings
,” ASME J. Tribol.
, 121
(1
), pp. 77
–84
.4.
Balbahadur
, A. C.
, and Kirk
, R.
, 2004
, “Part I—Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors
,” Int. J. Rotating Mach.
, 10
(6
), pp. 469
–475
.5.
Childs
, D. W.
, and Saha
, R.
, 2012
, “A New, Iterative, Synchronous-Response Algorithm for Analyzing the Morton Effect
,” ASME J. Eng. Gas Turbines Power
, 134
(7
), p. 072501
.6.
Lee
, J. G.
, and Palazzolo
, A.
, 2012
, “Morton Effect Cyclic Vibration Amplitude Determination for Tilt Pad Bearing Supported Machinery
,” ASME J. Tribol.
, 135
(1
), p. 011701
.7.
Suh
, J.
, and Palazzolo
, A.
, 2014
, “Three-Dimensional Thermohydrodynamic Morton Effect Simulation—Part I: Theoretical Model
,” ASME J. Tribol.
, 136
(3
), p. 031706
.8.
Suh
, J.
, and Palazzolo
, A.
, 2014
, “Three-Dimensional Thermohydrodynamic Morton Effect Analysis—Part II: Parametric Studies
,” ASME J. Tribol.
, 136
(3
), p. 031707
.9.
Nicholas
, J. C.
, Gunter
, E. J.
, and Allaire
, P. E.
, 1976
, “Effect of Residual Shaft Bow on Unbalance Response and Balancing of a Single Mass Flexible Rotor—Part I: Unbalance Response
,” ASME J. Eng. Gas Turbines Power
, 98
(2
), pp. 171
–181
.10.
Nicholas
, J. C.
, Gunter
, E. J.
, and Allaire
, P. E.
, 1976
, “Effect of Residual Shaft Bow on Unbalance Response and Balancing of a Single Mass Flexible Rotor—Part II: Balancing
,” ASME J. Eng. Gas Turbines Power
, 98
(2
), pp. 182
–187
.11.
Salamone
, D. J.
, 1977
, “Synchronous Unbalance Response of a Multimass Flexible Rotor Considering Shaft Warp and Disk Skew
,” Master thesis, University of Virginia, Charlottesville, VA.12.
Salamone
, D.
, and Gunter
, E.
, 1978
, “Effects of Shaft Warp and Disk Skew on the Synchronous Unbalance Response of a Multimass Rotor in Fluid Film Bearings
,” ASME Fluid Film Bearing and Rotor Bearing System Design and Optimization
, pp. 79
–107
.13.
Shiau
, T. N.
, and Lee
, E. K.
, 1989
, “The Residual Shaft Bow Effect on Dynamic Response of a Simply Supported Rotor With Disk Skew and Mass Unbalances
,” ASME J. Vib. Acoust.
, 111
(2
), pp. 170
–178
.14.
Murphy
, B. T.
, and Joshua
, A. L.
, 2010
, “Simplified Morton Effect Analysis for Synchronous Spiral Instability
,” ASME J. Vib. Acoust.
, 132
(5
), p. 051008
.15.
de Jongh
, F. M.
, and Morton
, P. G.
, 1996
, “The Synchronous Instability of a Compressor Rotor Due to Bearing Journal Differential Heating
,” ASME J. Eng. Gas Turbines Power
, 118
(4
), pp. 816
–824
.16.
API
, 2002
, “Axial and Centrifugal Compressors and Expander-Compressors for Petroleum, Chemical and Gas Industry Services
,” API 617 Standard
, API, Washington, DC.17.
de Jongh
, F. M.
, and van der Hoeven
, P.
, eds., 1998
, “Application of a Heat Barrier Sleeve to Prevent Synchronous Rotor Instability
,” Twenty-Seventh Turbomachinery Symposium, Turbomachinery Laboratory
, Texas A&M University, College Station, TX, pp. 17
–26
.18.
Balbahadur
, A.
, and Kirk
, R.
, 2004
, “Part II—Case Studies for a Synchronous Thermal Instability Operating in Overhung Rotors
,” Int. J. Rotating Mach.
, 10
(6
), pp. 477
–487
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