The Morton effect (ME) is a thermally induced instability problem that most commonly appears in rotating shafts with large overhung masses, outboard of the bearing span. The time-varying thermal bow due to the asymmetric journal temperature distribution may cause intolerable synchronous vibrations that exhibit a hysteresis behavior with respect to rotor speed. The fully nonlinear transient method designed for the ME prediction, in general, overhung rotors is proposed with the capability to perform the thermoelastohydrodynamic analysis for all the bearings and model the rotor thermal bow at both overhung ends with equivalent distributed unbalances. The more accurate nonlinear, coupled, double overhung approach is shown to provide significantly different response prediction relative to the more approximate linear method based using bearing coefficients and the single-overhung method, which assumes that the ME on both rotor ends can be decoupled. The flexibility of the bearing pad and pivot is investigated to demonstrate that the pivot flexibility can significantly affect the rotordynamics and ME, while the rigid pad model is generally a good approximation.
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January 2017
Research-Article
Double Overhung Disk and Parameter Effect on Rotordynamic Synchronous Instability—Morton Effect—Part I: Theory and Modeling Approach
Xiaomeng Tong,
Xiaomeng Tong
Mem. ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: tongxiaomeng1989@tamu.edu
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: tongxiaomeng1989@tamu.edu
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Alan Palazzolo
Alan Palazzolo
Professor
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Search for other works by this author on:
Xiaomeng Tong
Mem. ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: tongxiaomeng1989@tamu.edu
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: tongxiaomeng1989@tamu.edu
Alan Palazzolo
Professor
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 5, 2016; final manuscript received June 1, 2016; published online August 16, 2016. Assoc. Editor: Mihai Arghir.
J. Tribol. Jan 2017, 139(1): 011705 (11 pages)
Published Online: August 16, 2016
Article history
Received:
January 5, 2016
Revised:
June 1, 2016
Connected Content
A companion article has been published:
Double Overhung Disk and Parameter Effect on Rotordynamic Synchronous Instability—Morton Effect—Part II: Occurrence and Prevention
Citation
Tong, X., and Palazzolo, A. (August 16, 2016). "Double Overhung Disk and Parameter Effect on Rotordynamic Synchronous Instability—Morton Effect—Part I: Theory and Modeling Approach." ASME. J. Tribol. January 2017; 139(1): 011705. https://doi.org/10.1115/1.4033888
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