The servo valve input signal and the radial injection pressure are the two main parameters responsible for dynamically modifying the journal oil film pressure and generating active fluid film forces in controllable fluid film bearings. Such fluid film forces, resulting from a strong coupling between hydrodynamic, hydrostatic and controllable lubrication regimes, can be used either to control or to excite rotor lateral vibrations. An accurate characterization of the active oil film forces is of fundamental importance to elucidate the feasibility of applying the active lubrication as non-invasive perturbation forces, or in other words, as a “calibrated shaker”, to perform in-situ rotordynamic tests. The main original contributions of this paper are three: a) the experimental characterization of the active fluid film forces generated in an actively-lubricated tilting-pad journal bearing in the frequency domain and the application of such a controllable bearing as a calibrated shaker aiming at determining the frequency response function (FRF) of rotordynamic systems; b) experimental quantification of the influence of the supply pressure and servo valve input signal on the FRF of rotor-journal bearing systems; c) experimental indication of how small such active fluid film forces (perturbation forces) should be, in order to perturb the rotor-journal bearing system without significantly changing its dynamic characteristics. To validate the experimental procedure and results obtained via actively-lubricated bearing, similar experimental tests are carried out using an electro-magnetic shaker. Very good agreements between the two experimental approaches are found. Maximum values of the main input parameters, namely servo valve voltage and radial injection pressure, are experimentally identified/suggested with the objective of obtaining non-invasive perturbation forces.
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ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
June 3–7, 2013
San Antonio, Texas, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5527-0
PROCEEDINGS PAPER
Actively Lubricated Bearings Applied as Calibrated Shakers to Aid Parameter Identification in Rotordynamics Available to Purchase
Ilmar Ferreira Santos,
Ilmar Ferreira Santos
Technical University of Denmark, Kgs. Lyngby, Denmark
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Alejandro Cerda Varela
Alejandro Cerda Varela
Technical University of Denmark, Kgs. Lyngby, Denmark
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Ilmar Ferreira Santos
Technical University of Denmark, Kgs. Lyngby, Denmark
Alejandro Cerda Varela
Technical University of Denmark, Kgs. Lyngby, Denmark
Paper No:
GT2013-95674, V07BT30A025; 12 pages
Published Online:
November 14, 2013
Citation
Santos, IF, & Varela, AC. "Actively Lubricated Bearings Applied as Calibrated Shakers to Aid Parameter Identification in Rotordynamics." Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. Volume 7B: Structures and Dynamics. San Antonio, Texas, USA. June 3–7, 2013. V07BT30A025. ASME. https://doi.org/10.1115/GT2013-95674
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