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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Experimental Investigation of Adaptive Control Applied to HSFD Supported Rotors

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

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

J. Eng. Gas Turbines Power 122(4), 685-692 (May 15, 2000) (8 pages) doi:10.1115/1.1287264 History: Received March 09, 1999; Revised May 15, 2000
Copyright © 2000 by ASME
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References

White, D. C., 1972, “The Dynamics of a Rigid Rotor Supported on Squeeze Film Bearings,” Conference on Vibrations in Rotating Machinery, Proc. I. Mech. E., pp. 213–229.
Gunter,  E. J., Barrett,  L. E., and Allaire,  P. E., 1977, “Design of Nonlinear Squeeze Film Dampers for Aircraft Engines,” ASME J. Lubr. Technol., 99, No. 1, pp. 57–64.
Holmes, R., and Dogan, M., 1985, “The Performance of a Sealed Squeeze Film Bearing in a Flexible Support Structure,” Proc. I. Mech. E., 199 , No. 1.
Burrows, C. R., Sahinkaya, M. N., and Turkay, O. S., 1983, “An Adaptive Squeeze-Film Bearing,” ASME Paper 83-Lub-23.
Adams, M. L., and Zahloul, H., 1987, “Attenuation of Rotor Vibration Using Controlled-Pressure Hydrostatic Squeeze-Film Dampers,” presented at the Eleventh Biennial ASME Vibrations Conference, Boston, MA, September 1987.
Mu,  C., Darling,  J., and Burrows,  R., 1991, “An Appraisal of a Proposed Active Squeeze Film Damper,” ASME J. Tribol., 113, No. 4, pp. 750–754.
El-Shafei, A., 1991, “Hybrid Squeeze Film Damper for Active Control of Rotors,” U.S. Patent number 5.058.452.
El-Shafei,  A., 1993, “Experimental and Analytical Investigation of Hybrid Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 115, No. 2, pp. 353–359.
El-Shafei,  A., and Hathout,  J.-P., 1995, “Modelling and Control of HSFDs for Active Control of Rotor-Bearing Systems,” ASME J. Eng. Gas Turbines Power, 117, No. 4, pp. 757–766.
Hathout, J. P., and El-Shafei, A., 1996, “Adaptive Control of Rotor-Bearing Systems Using Hybrid Squeeze Film Dampers,” Proceedings of Sixth Int. Conf. On Vibration in Rotating Machinery, Oxford, England, I. Mech. E., 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, No. 3, 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, No. 1, pp. 49–56.
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.
El-Shafei, A., El-Hakim, M., and Hathout, J.-P., 1993, “Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers,” Report MDP-EOARD-2/94, Cairo University.
El-Shafei,  A., 1990, “Unbalance Response of a Jeffcott Rotor Incorporating Short Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 112, No. 4, pp. 445–453.
El-Shafei, A., Massoud, A. T., El-Hakim, M., Hathout, J.-P., Youssef, R., 1997, “Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers,” Report MDP-EOARD-1/97, Cairo University.
Astrom, K. J., and Wittenmark, B., 1989, Adaptive Control, Addison-Wesley, Reading, MA.

Figures

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Experimental results of model reference adaptive controller (θ case): (a) experimental response at D2 journal center; (b) experimental response at CM location; (c) controller actuating signal
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Experimental results of model reference adaptive controller (θ+Kp Case): (a) experimental response at D2 journal center; (b) experimental response at CM location; (c) controller actuating signal
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Experimental results of model reference adaptive controller (θ* Kp Case): (a) experimental response at D2 journal center; (b) experimental response at CM location; (c) controller actuating signal
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Experimental results of MRAC controller (θ+Kp Case)
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Experimental results of MRAC controller (θ Case)
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Experimental results of MRAC controller (θ* Kp Case)
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Cut-out of manufactured HSFD
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The test rotor and its mode shapes
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Automated hydraulic circuit
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Computer controlled test rig
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Test rig and its instrumentation
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Block diagram of open-loop system
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Short and long modes for the open-loop system

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