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Rotor Model Validation for an Active Magnetic Bearing Machining Spindle Using mu-Synthesis Approach

[+] Author Affiliations
Ryan J. Madden, Jerzy T. Sawicki

Cleveland State University, Cleveland, OH

Paper No. GT2012-69943, pp. 703-709; 7 pages
doi:10.1115/GT2012-69943
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 7: Structures and Dynamics, Parts A and B
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4473-1
  • Copyright © 2012 by ASME

abstract

Model-based identification and μ-synthesis are employed for model updating of the rotor for a high-speed machining spindle supported on active magnetic bearings. The experimentally validated model is compared with a nominal engineering model to identify the unmodeled dynamics. This extracted missing dynamics from the nominal rotor model provides engineering insight into an effective model correction strategy. The corrected rotor model is validated by successful implementation of a number of μ-synthesized controllers, providing robust and stable levitation of the spindle over its entire operating speed range.

Copyright © 2012 by ASME

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