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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics, and Controls, Diagnostics, and Instrumentation

Active Control Algorithms for the Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers

[+] Author and Article Information
A. El-Shafei

Department of Mechanical Design and Production, Faculty of Engineering, Cairo University, Giza 12316, Egypt

J. Eng. Gas Turbines Power 124(3), 598-607 (Jun 19, 2002) (10 pages) doi:10.1115/1.1421058 History: Received November 01, 1999; Revised February 01, 2000; Online June 19, 2002
Copyright © 2002 by ASME
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References

Figures

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Cutout of manufactured hybrid squeeze film damper (HSFD)
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Automated hydraulic circuit
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(a) Open-loop system, (b) generic control loop for HSFD-rotor system
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Coast-down test of on/off controller; (a) experimental response of rotor at damper 2 for on/off controller, (b) Experimental response of rotor at CM2 for on/off controller, (c) actuating signal for on/off controller
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Coast-down test of PI-controller; (a) experimental response of rotor at damper 2 for PI-controller, (b) experimental response of rotor at CM2 for PI-controller, (c) actuating signal for PI-controller
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Controlled sudden unbalance, U=0.1, 0.15, and 0.2, PI-controller; (a) eccentricity ratio ε, (b) vibration amplitude at rotor center r, (c) transmitted force F, and (d) sealing ring motion λ
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Coast-down test of NP-controller; (a) (b) (c)
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Coast-down test of GS-PI controller; (a) experimental response of rotor at damper 2 for GS-PI controller, (b) experimental response of rotor at CM2 for GS-PI controller, (c) actuating signal for GS-PI controller
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Coast-down test of MRAC-controller theta case; (a) experimental response of rotor at damper 2 for MRAC-controller theta case, (b) experimental response of rotor at CM2 for MRAC-controller theta case, and (c) actuating signal for MRAC-controller theta case
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Adaptive controller (model reference adaptive controller (MRAC))
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Controlled sudden unbalance, (u=0.1, 0.15, and 0.2, MAEC-controller; (a) eccentricity ratio ε, (b) vibration amplitude at rotor center r, (c) transmitted force F, and (d) sealing ring motion λ

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