Rubbing between rotating and stationary surfaces in turbomachinery can result in catastrophic failures if not caught quickly. Removing the rub impact can then often require time consuming and expensive solutions including field balancing or magnetic bearing systems. However, simple changes in bearing dynamics via bearing and lubricant adjustment could provide for a faster and cheaper alternative. In this work, a three-disk rotor was examined analytically for nonlinear rotordynamic behavior due to an unbalance-driven rub. The rotordynamic solution was obtained using nonlinear and steady state finite element models to demonstrate the effect of the rub impact on the dynamic response of the machine. A thermoelastohydrodynamic (TEHD) model of tilting pad journal bearing performance was also used to study the possible removal of the rub impact by making minor adjustments to bearing parameters including preload, clearance, pad orientation, and lubricant properties. Gas-expanded lubricants (GELs), tunable mixtures of synthetic oil and carbon dioxide that have been proposed as a means to provide control in bearing-rotor systems, were also considered for their possible role in controlling the rub. The TEHD model provided a range of bearing inputs to the rotor models in the form of stiffness and damping coefficients. Results from the rotordynamic analyses included an assessment of critical speeds, peak rotor displacements, and vibration characteristics. Individual bearing parameter adjustments were found to have smaller, though still significant effects on the response of the machine. Overall, it was found that by adjusting a combination of these bearing parameters, the peak displacement of the rotor could be reduced by large enough amounts to remove the rub impact in the machine, hence providing a simple approach to solving rub impact problems in rotating machinery caused by excessive vibration.
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September 2015
Research-Article
Nonlinear Analysis of Rub Impact in a Three-Disk Rotor and Correction Via Bearing and Lubricant Adjustment
Brian K. Weaver,
Brian K. Weaver
Rotating Machinery and Controls Laboratory,
Department of Mechanical and
Aerospace Engineering,
Charlottesville, VA 22904
e-mail: bkw3q@virginia.edu
Department of Mechanical and
Aerospace Engineering,
University of Virginia
,122 Engineer’s Way
,Charlottesville, VA 22904
e-mail: bkw3q@virginia.edu
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Ya Zhang,
Ya Zhang
College of Mechanical and
Electrical Engineering,
Chaoyang District,
Beijing 100029,
e-mail: zhangya@mail.buct.edu.cn
Electrical Engineering,
Beijing University of Chemical Technology
,P.O. Box 93, No. 15 Beisanhuan East Road
,Chaoyang District,
Beijing 100029,
China
e-mail: zhangya@mail.buct.edu.cn
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Andres F. Clarens,
Andres F. Clarens
Rotating Machinery and Controls Laboratory,
Department of Civil and
Environmental Engineering,
Charlottesville, VA 22904
e-mail: aclarens@virginia.edu
Department of Civil and
Environmental Engineering,
University of Virginia
,351 McCormick Road
,Charlottesville, VA 22904
e-mail: aclarens@virginia.edu
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Alexandrina Untaroiu
Alexandrina Untaroiu
Rotating Machinery and Controls Laboratory,
Department of Mechanical and
Aerospace Engineering,
Charlottesville, VA 22904
e-mail: au6d@virginia.edu
Department of Mechanical and
Aerospace Engineering,
University of Virginia
,122 Engineer’s Way
,Charlottesville, VA 22904
e-mail: au6d@virginia.edu
Search for other works by this author on:
Brian K. Weaver
Rotating Machinery and Controls Laboratory,
Department of Mechanical and
Aerospace Engineering,
Charlottesville, VA 22904
e-mail: bkw3q@virginia.edu
Department of Mechanical and
Aerospace Engineering,
University of Virginia
,122 Engineer’s Way
,Charlottesville, VA 22904
e-mail: bkw3q@virginia.edu
Ya Zhang
College of Mechanical and
Electrical Engineering,
Chaoyang District,
Beijing 100029,
e-mail: zhangya@mail.buct.edu.cn
Electrical Engineering,
Beijing University of Chemical Technology
,P.O. Box 93, No. 15 Beisanhuan East Road
,Chaoyang District,
Beijing 100029,
China
e-mail: zhangya@mail.buct.edu.cn
Andres F. Clarens
Rotating Machinery and Controls Laboratory,
Department of Civil and
Environmental Engineering,
Charlottesville, VA 22904
e-mail: aclarens@virginia.edu
Department of Civil and
Environmental Engineering,
University of Virginia
,351 McCormick Road
,Charlottesville, VA 22904
e-mail: aclarens@virginia.edu
Alexandrina Untaroiu
Rotating Machinery and Controls Laboratory,
Department of Mechanical and
Aerospace Engineering,
Charlottesville, VA 22904
e-mail: au6d@virginia.edu
Department of Mechanical and
Aerospace Engineering,
University of Virginia
,122 Engineer’s Way
,Charlottesville, VA 22904
e-mail: au6d@virginia.edu
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 2, 2014; final manuscript received January 30, 2015; published online February 25, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Sep 2015, 137(9): 092504 (8 pages)
Published Online: September 1, 2015
Article history
Received:
December 2, 2014
Revision Received:
January 30, 2015
Online:
February 25, 2015
Citation
Weaver, B. K., Zhang, Y., Clarens, A. F., and Untaroiu, A. (September 1, 2015). "Nonlinear Analysis of Rub Impact in a Three-Disk Rotor and Correction Via Bearing and Lubricant Adjustment." ASME. J. Eng. Gas Turbines Power. September 2015; 137(9): 092504. https://doi.org/10.1115/1.4029778
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