Model Identification of a Rotor With Magnetic Bearings
Author:
Va´zquez J. A.1, Maslen E. H.1, Ahn H.-J.2, Han D.-C.2
Affiliation:
1. Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA 22904-4746 2. School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak-ku, Shilim-dong San 56-1, Seoul, Korea
Abstract
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.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference8 articles.
1. Maslen, E. H., Va´zquez, J. A., and Sortore, C. K., 2002, “Reconciliation of Rotordynamic Models With Experimental Data,” ASME J. Eng. Gas Turbines Power, 124, pp. 351–356. 2. Ga¨hler, C., and Herzog, R., 1994, “Identification of Magnetic Bearing Systems,” Proceedings of the Fourth International Symposium on Magnetic Bearings, ETH Zurich, Aug., pp. 293–298. 3. Zhou, K., Doyle, J. C., and Glover, K., 1996, Robust and Optimal Control, Prentice-Hall, Englewood Cliffs, NJ. 4. Maslen, E. H., and Meeker, D. C., 1995, “Fault Tolerance of Magnetic Bearings by Generalized Bias Current Linearization,” IEEE Trans. Magn., 31(3), May pp. 2304–2314. 5. Maslen, E. H., Sortore, C. K., Williams, R. D., Fedigan, S. J., and Aimone, R. J., 1999, “Fault Tolerant Magnetic Bearings,” ASME J. Eng. Gas Turbines Power, 121, pp. 504–508.
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