This paper investigates the vibration characteristics of rotor displacement signals in a magnetic bearing system under conditions when rotor contact with auxiliary bearings is possible. Since these signals may be used for feedback control, it is necessary to determine how they may affect the ability of the controller to regain rotor levitation. An experimental system is used to demonstrate the sensitivity of the rotor nonlinear dynamic behavior to unbalance, which is sufficient to cause contact during rotor run-up through rigid-body and flexural mode critical speeds. Complex rotor dynamics may involve contact with more than one auxiliary bearing or bush. Application of appropriate rotating forces to the rotor through a magnetic bearing is also shown to induce similar contact dynamics. Thus, an alternative procedure for assessing the nonlinear rotor dynamic behavior is established with the potential for identification of appropriate control forces. The contact dynamics are also considered in the presence of auxiliary bearing misalignment. Misalignment may arise through physical translation of a housing or through steady-state offset errors in sensor measurements. A misalignment of 50% of the nominal radial clearance is applied at an auxiliary bearing. Various contact modes are evident as the rotor is run up in speed. During rundown, different contact dynamics may be encountered and the level of such hysteresis is assessed.
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April 2006
Technical Papers
Contact Dynamic Response With Misalignment in a Flexible Rotor/Magnetic Bearing System
P. S. Keogh,
P. S. Keogh
Department of Mechanical Engineering, Faculty of Engineering and Design,
University of Bath
, Bath BA2 7AY, UK
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M. O. T. Cole
M. O. T. Cole
Department of Mechanical Engineering, Faculty of Engineering and Design,
University of Bath
, Bath BA2 7AY, UK and Department of Mechanical Engineering, Chiang Mai University
, Chiang Mai 50200, Thailand
Search for other works by this author on:
P. S. Keogh
Department of Mechanical Engineering, Faculty of Engineering and Design,
University of Bath
, Bath BA2 7AY, UK
M. O. T. Cole
Department of Mechanical Engineering, Faculty of Engineering and Design,
University of Bath
, Bath BA2 7AY, UK and Department of Mechanical Engineering, Chiang Mai University
, Chiang Mai 50200, ThailandJ. Eng. Gas Turbines Power. Apr 2006, 128(2): 362-369 (8 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Keogh, P. S., and Cole, M. O. T. (March 1, 2004). "Contact Dynamic Response With Misalignment in a Flexible Rotor/Magnetic Bearing System." ASME. J. Eng. Gas Turbines Power. April 2006; 128(2): 362–369. https://doi.org/10.1115/1.2056530
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