TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Control System Design for Active Lubrication With Theoretical and Experimental Examples

[+] Author and Article Information
I. F. Santos, A. Scalabrin

DPM–Department of Mechanical Design, UNICAMP–State University of Campinas, Campinas, Sao Paulo 13083-970, Brazil

J. Eng. Gas Turbines Power 125(1), 75-80 (Dec 27, 2002) (6 pages) doi:10.1115/1.1451757 History: Received November 01, 1999; Revised February 01, 2000; Online December 27, 2002
Copyright © 2003 by ASME
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Ulbrich, H., and Althaus, J., 1989, “Actuator Design for Rotor Control,” 12th Biennial ASME Conference on Vibration and Noise, Vol. 1, ASME, New York, pp. 17–22.
Santos, I. F., and Ulbrich, H., 1992, “Actively Controlled Tilting Pad Journal Bearings,” ISROMAC - The International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu, Vol. 2, pp. 423–431.
Santos, I. F., 1993, Aktive Kippsegmentlagerung—Theorie und Experiment (Schwingungstechnik, 189), VDI-Verlag, Dusseldorf.
Santos,  I. F., 1995, “On the Adjusting of the Dynamic Coefficients of Tilting-Pad Journal Bearings,” STLE Tribol. Trans., 38, No. 3, pp. 700–706.
Santos, I. F., 1994, “Design and Evaluation of Two Types of Active Tilting-Pad Journal Bearings,” IUTAM Symposium on Active Control of Vibration, Bath, England, pp. 79–87.
Santos, I. F., 1995, “Strategien für die Erhöhung der Dämpfungsreserve von kippsegmentgelagerten Rotorsystemen,” Schwingungen in rotierenden Maschinen, Vol. 3, pp. 3–12.
Santos,  I. F., and Russo,  F. H., 1998, ‘Tilting-Pad Journal Bearings with Electronic Radial Oil Injection,Tilting-Pad Journal Bearings with Electronic Radial Oil Injection,’ ASME J. Tribol., 120, pp. 583–594.
Santos,  I. F., and Nicoletti,  R., 1999, ‘THD Analysis in Tilting-Pad Journal Bearings Using Multiple Orifice Hybrid Lubrication,THD Analysis in Tilting-Pad Journal Bearings Using Multiple Orifice Hybrid Lubrication,’ ASME J. Tribol., 121, pp. 892–900.
Bently, D. E., Grant, J. W., and Hanifan, P., 1999, “Active Control Fluid Bearings for a New Generation of Machines,” Orbits, Second/Third Quarters, Vol. 20, No. 2, pp. 15–20.
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Scalabrin, A., 1999, “Utilização de Mancais Segmentados com Injeção Electro⁁nica para Controle de Rotores - Teoria e Experimento,” Master thesis, Department of Mechanical Design, State University of Campinas, Brazil.


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Coupling between servovalves and bearing by means of pipelines
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Tilting-pad journal bearing with orifices machined on the pad surfaces
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Details of the pad parts and pipeline connections for injecting oil into the bearing gap. From left to right one can see feedline, the inferior part of the pad and the superior one (with 5 and 15 orifices), which attached to each other by screws create a small sealed reservoir.
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Scheme of the operational principle of the active lubrication
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Global system—rigid rotor, active bearing, and servovalves
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Real part of the eigenvalues as a function of displacement feedback gains G1 and G3. Point A is related to the y-direction and point B to the z-direction.
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Real part of the eigenvalues as a function of velocity feedback gains G2 and G4. Point A is related to the y-direction and point B to the z-direction.
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Frequency response curves of the rotor for five different cases: (a) –conventionally lubricated; (b) [[dot_dash_line]] hybridly lubricated; (c) [[dashed_line]]actively lubricated with displacement feedback control; (d) [[dotted_line]] actively lubricated with velocity feedback control; (e) –actively lubricated with displacement and velocity feedback control
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Experimental results showing the vibration amplitude of the rotor, when the control system is turned on after 0.5 s




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