In the present paper, the dynamic response of a rotor supported by an active lubricated tilting-pad bearing is investigated in the frequency domain. The theoretical part of the investigation is based on a mathematical model obtained by means of rigid body dynamics. The oil film forces are inserted into the model by using two different approaches: (a) linearized active oil film forces and the assumption that the hydrodynamic forces and the active hydraulic forces can be decoupled, and (b) equivalent dynamic coefficients of the active oil film and the solution of the modified Reynolds equation for the active lubrication. The second approach, based on the equivalent dynamic coefficients, leads to more accurate results because it includes the frequency dependence of the active hydraulic forces. Theoretical and experimental results reveal the feasibility of reducing resonance peaks by using the active lubricated tilting-pad bearing. By applying a simple proportional controller, it is possible to reach 30% reduction of the resonance peak associated with the first rigid body mode shape of the system. One of the most important consequences of such a vibration reduction in rotating machines is the feasibility of increasing their operational range by attenuating resonance peaks and reducing vibration problems.
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July 2005
Technical Papers
Frequency Response Analysis of an Actively Lubricated Rotor/Tilting-Pad Bearing System
Rodrigo Nicoletti,
Rodrigo Nicoletti
Ford Motor Co., Complexo Industrial Ford Nordeste, Camacari 42810-900, Brazil
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Ilmar Ferreira Santos
Ilmar Ferreira Santos
Department of Mechanical Engineering, Technical University of Denmark, Lyngby 2800, Denmark
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Rodrigo Nicoletti
Ford Motor Co., Complexo Industrial Ford Nordeste, Camacari 42810-900, Brazil
Ilmar Ferreira Santos
Department of Mechanical Engineering, Technical University of Denmark, Lyngby 2800, Denmark
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Vienna, Austria, June 13–17, 2004, Paper No. 2004-GT-54034. Manuscript received by IGTI, October 1, 2003; final revision, March 1, 2004. IGTI Review Chair: A. J. Strazisar.
J. Eng. Gas Turbines Power. Jul 2005, 127(3): 638-645 (8 pages)
Published Online: June 24, 2005
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Online:
June 24, 2005
Citation
Nicoletti, R., and Santos, I. F. (June 24, 2005). "Frequency Response Analysis of an Actively Lubricated Rotor/Tilting-Pad Bearing System ." ASME. J. Eng. Gas Turbines Power. July 2005; 127(3): 638–645. https://doi.org/10.1115/1.1850940
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