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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

On the Control of Synchronous Vibration in Rotor/Magnetic Bearing Systems Involving Auxiliary Bearing Contact

[+] Author and Article Information
P. S. Keogh, M. O. T. Cole, M. N. Sahinkaya, C. R. Burrows

Department of Mechanical Engineering, Faculty of Engineering and Design, University of Bath, Bath BA2 7AY, UK

J. Eng. Gas Turbines Power 126(2), 366-372 (Jun 07, 2004) (7 pages) doi:10.1115/1.1689362 History: Received December 01, 2001; Revised March 01, 2002; Online June 07, 2004
Copyright © 2004 by ASME
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References

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Chen, H. M., Walton, J., and Heshmat, H., 1997, “Zero Clearance Auxiliary Bearings for Magnetic Bearing Systems,” ASME TURBO EXPO 97, Orlando, FL.
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Fumagalli, M., Varadi, P., and Schweitzer, G., 1994, “Impact Dynamics of High Speed Rotors in Retainer Bearings and Measurement Concepts,” Proceedings, 4th International Symposium on Magnetic Bearings, ETH Zurich, Zurich, Switzerland, pp. 239–244.
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Kirk, R. G., Swanson, E. E., Kavarana, F. H., and Wang, X., 1994, “Rotor Drop Test Stand for AMB Rotating Machinery, Part 1: Description of Test Stand and Initial Results,” Proceedings, 4th International Symposium on Magnetic Bearings, ETH Zurich, Zurich, Switzerland, pp. 207–212.
Kirk,  R. G., 1999, “Evaluation of AMB Turbomachinery Auxiliary Bearings,” ASME J. Vibr. Acoust., 121, pp. 156–161.
Schmied, J., and Pradetto, J. C., 1992, “Behavior of a One Ton Rotor BeingDropped into Auxiliary Bearings,” Proceedings, 3rd International Symposium on Magnetic Bearings, Alexandria, VA, Technomic Publishing, Lancaster, PA, pp. 145–156.
Lawen,  J. L., and Flowers,  G. T., 1997, “Synchronous Dynamics of a Coupled Shaft/Bearing/Housing System With Auxiliary Support from a Clearance Bearing,” ASME J. Eng. Gas Turbines Power, 119, pp. 430–435.
Lawen,  J. L., and Flowers,  G. T., 1999, “Interaction Dynamics Between a Flexible Rotor and an Auxiliary Clearance Bearing,” ASME J. Vibr. Acoust., 121, pp. 183–189.
Xie,  H., Flowers,  G. T., Feng,  L., and Lawrence,  C., 1999, “Steady-State Dynamic Behavior of a Flexible Rotor With Auxiliary Support from a Clearance Bearing,” ASME J. Vibr. Acoust., 121, pp. 78–83.

Figures

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Rotor orbits at selected times (see Fig. 7, rotor speed 24 Hz, 480 gcm unbalance). A–before vibration control, C–after modified synchronous vibration control, E–following final synchronous vibration control.
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Schematic layout of flexible rotor/magnetic bearing facility showing sensors (1–8), auxiliary bearings and bushes (A–F)
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Magnitudes of measured synchronous vibration components at selected sensors
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Phases of measured synchronous vibration components at selected sensors
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System structure with contact dynamics
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Synchronous control with rotor contact (rotor speed 24 Hz, 480 gcm unbalance)
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Rotor orbits before and after synchronous control force application (rotor speed 24 Hz, 480 gcm unbalance)
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Modified synchronous vibration control with rotor contact (rotor speed 24 Hz, 480 gcm unbalance)

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