The experimental identification of a long flexible rotor with three magnetic bearing journals is presented. Frequency response functions are measured between the magnetic bearing journals and the sensor locations while the rotor is suspended horizontally with piano wire. These frequency response functions are compared with the responses of a rotor model and a reconciliation process is used to reduce the discrepancies between the model and the measured data. In this identification, the wire and the fit of the magnetic bearing journals are identified as the sources of model error. As a result of the reconciliation process, equivalent dynamic stiffness are calculated for the piano wire and the fit of the magnetic bearing journals. Several significant numeral issues that were encountered during the process are discussed and solutions to some of these problems are presented.
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e-mail: ehm7s@Virginia.edu
e-mail: ahj@amed.snu.ac.kr
e-mail: amed.snu.ac.kr
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January 2003
Technical Papers
Model Identification of a Rotor With Magnetic Bearings
J. A. Va´zquez,
J. A. Va´zquez
Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA 22904-4746
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E. H. Maslen,
e-mail: ehm7s@Virginia.edu
E. H. Maslen
Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA 22904-4746
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H.-J. Ahn,
e-mail: ahj@amed.snu.ac.kr
H.-J. Ahn
School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak-ku, Shilim-dong San 56-1, Seoul, Korea
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D.-C. Han
e-mail: amed.snu.ac.kr
D.-C. Han
School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak-ku, Shilim-dong San 56-1, Seoul, Korea
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J. A. Va´zquez
Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA 22904-4746
E. H. Maslen
Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA 22904-4746
e-mail: ehm7s@Virginia.edu
H.-J. Ahn
School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak-ku, Shilim-dong San 56-1, Seoul, Korea
e-mail: ahj@amed.snu.ac.kr
D.-C. Han
School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak-ku, Shilim-dong San 56-1, Seoul, Korea
e-mail: amed.snu.ac.kr
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, LA, June 4–7, 2001; Paper 2001-GT-566. Manuscript received by IGTI, Dec. 2000, final revision, Mar. 2001. Associate Editor: R. Natole.
J. Eng. Gas Turbines Power. Jan 2003, 125(1): 149-155 (7 pages)
Published Online: December 27, 2002
Article history
Received:
December 1, 2000
Revised:
March 1, 2001
Online:
December 27, 2002
Citation
Va´zquez, J. A., Maslen, E. H., Ahn, H., and Han, D. (December 27, 2002). "Model Identification of a Rotor With Magnetic Bearings ." ASME. J. Eng. Gas Turbines Power. January 2003; 125(1): 149–155. https://doi.org/10.1115/1.1499730
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