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Exploration of NDE Properties of AMB Supported Rotors for Structural Damage Detection

[+] Author Affiliations
Jerzy T. Sawicki, Dmitry L. Storozhev

Cleveland State University, Cleveland, OH

John D. Lekki

NASA Glenn Research Center, Brookpark, OH

Paper No. GT2010-23772, pp. 1369-1376; 8 pages
doi:10.1115/GT2010-23772
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

This paper addresses self-diagnostic properties of AMB (active magnetic bearing) supported rotors for on-line detection of the transverse crack on a rotating shaft. In addition to pure levitation, the rotor supporting bearing also serves as an actuator that transforms current signals additionally injected into the control loop into the superimposed specially selected excitation forces into the suspended rotor. These additional excitations induce combination frequencies in the rotor response, providing unique signatures for the presence of crack. The background of theoretical modeling, experimental and computer simulation results for the AMB supported cracked rotor with self-diagnostic excitation forces are presented and discussed.

Copyright © 2010 by ASME

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