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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

Vance, J. M., Ying, D., and Nikolajsen, J. L., 1999, “Actively Controlled Bearing Dampers for Aircraft Engine Applications,” ASME Paper 99-GT-18.
El-Shafei, A., El-Hakim, M. M., and Hathout, J.-P., 1993, “Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers,” Report No. MDP-EOARD-1/93, Cairo University.
El-Shafei, A., El-Hakim, M. M., Hathout, J. P., and Youssef, R. Y., 1994, “Development of Hybrid Squeeze Film Damper for Active Control of Rotor Vibrations,” Report No. MDP-EOARD-1/94, Cairo University.
El-Shafei, A., Massoud, A. T., El-Hakim, M., Hathout, J.-P. and Youssef, R., 1997, “Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers,” Report MDP-EOARD-1/97, Cairo University.
El-Shafei,  A., 1993, “Experimental and Analytical Investigation of Hybrid Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 115, pp. 353–359.
El-Shafei,  A., and Hathout,  J. P., 1995, “Modeling and Control of HSFDs for Active Control of Rotor-Bearing Systems,” ASME J. Eng. Gas Turbines Power, 117, pp. 757–766.
El-Shafei, A., and El-Hakim, M., 1995, “Development of a Test Rig and Experimental Verification of the Performance of HSFDs for Active Control of Rotors,” ASME Paper 95-GT-256.
Hathout, J.-P., and El-Shafei, A., 1996, “Adaptive Control of Rotor-Bearing Systems Using Hybrid Squeeze Film Dampers,” Proc. Inst. Mech. Eng., pp. 671–690.
Hathout,  J. P., and El-Shafei,  A., 1997, “PI Control of HSFDs for Active Control of Rotor-Bearing-Systems,” ASME J. Eng. Gas Turbines Power, 119, pp. 658–667.
Hathout,  J. P., El-Shafei,  A., and Youssef,  R., 1997, “Active Control of Multi-Mode Rotor-Bearing Systems Using HSFDs,” ASME J. Tribol., 119, pp. 49–56.
El-Shafei, A., and El-Hakim, M., 1999, “Experimental Investigation of Adaptive Control Applied to HSFD Supported Rotors,” ASME Paper 99-GT-176.
El-Shafei, A., and El-Hakim, M., 2000, “Experimental PID Control of HSFD Supported Rotors,” ASME J. Dyn. Syst., Meas., Control, submitted for publication.
El-Shafei, A., and El-Hakim, M., 2000, “On-Off Control of HSFD Supported Rotors,” presented at the International Conference on Vibrations in Rotating Machinery, Proc. Inst. Mech. Eng., Sept. 12–14, Nottingham, U.K.
Akin, J. T., 1990, private communication, Pratt & Whitney.
Feder,  E., Bansal,  P. N., and Blanco,  A., 1978, “Investigation of Squeeze Film Damper Forces Produced by Circular Centered Orbits,” ASME J. Eng. Gas Turbines Power, 100, pp. 15–21.
Holmes,  R., and Dogan,  M., 1985, “The Performance of a Sealed Squeeze-Film Bearing in a Flexible Support Structure,” Proc. Inst. Mech. Eng., 199, No. Cl.
El-Shafei,  A., 1991, “Unbalance Response of Jeffcott Rotor Incorporating Long Squeeze Film Dampers,” ASME J. Vibr. Acoust., 113, pp. 85–94.
El-Shafei, A., 1989, “Long and Short Bearing Approximations for Squeeze Film Dampers,” Proceedings of the Vibration Institute, Vibration Institute, pp. 145–151.
El-Shafei, A., 1991, “Hybrid Squeeze film Damper for Active Control of Rotors,” U.S. Patent number 5,058,452, Oct.
El-Shafei,  A., 1990, “Unbalance Response of a Jeffcott Rotor Incorporating Short Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 112, pp. 445–453.
Burrows, C. R., Sahinkaya, M. N., and Turkay, O. S., 1983, “An Adaptive Squeeze-Film Bearing,” ASME Paper No. 83-Lub-23.
Xu, Y., Hollerbach, J. M., and Ma, D., 1995, “A Nonlinear PD Controller for Force and Contact Transient Control,” IEEE Journal of Control Systems, Feb., pp. 15–21.
Xu, Y., Hollerbach, J. M., and Ma, D., 1993, “Nonlinear Proportional and Derivative Control for High Disturbance Rejection and High Gain Force Control,” Proc. IEEE, May, pp. 924–930.
Astrom, K. J., and Wittenmark, B., 1989, Adaptive Control, Addison-Wesley, Reading, MA.

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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