Frequency Response Analysis of an Actively Lubricated Rotor/Tilting-Pad Bearing System

Rodrigo Nicoletti, Ilmar Santos

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    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; (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 since 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.
    Original languageEnglish
    Title of host publicationProcedings of 2004 ASME Turbo Expo
    Publication date2004
    ISBN (Print)0-7918-3739-1
    Publication statusPublished - 2004
    Event2004 ASME Turbo Expo - Vienna, Austria
    Duration: 14 Jun 200417 Jun 2004


    Conference2004 ASME Turbo Expo
    Internet address


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