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

Rodrigo Nicoletti, Ilmar Santos

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalJournal of Engineering for Gas Turbines and Power
Volume127
Issue number3
Pages (from-to)638-645
ISSN0742-4795
DOIs
Publication statusPublished - 2005
Event49th International Gas Turbine and Aeroengine Congress and Exhibition - Vienna, Austria
Duration: 13 Jun 200417 Jun 2004

Conference

Conference49th International Gas Turbine and Aeroengine Congress and Exhibition
CountryAustria
CityVienna
Period13/06/200417/06/2004

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