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Proceedings Paper

Damage identification via asymmetric active magnetic bearing acceleration feedback control
Author(s): Jie Zhao; Hans DeSmidt; Wei Yao
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Paper Abstract

A Floquet-based damage detection methodology for cracked rotor systems is developed and demonstrated on a shaft-disk system. This approach utilizes measured changes in the system natural frequencies to estimate the severity and location of shaft structural cracks during operation. The damage detection algorithms are developed with the initial guess solved by least square method and iterative damage parameter vector by updating the eigenvector updating. Active Magnetic Bearing is introduced to break the symmetric structure of rotor system and the tuning range of proper stiffness/virtual mass gains is studied. The system model is built based on energy method and the equations of motion are derived by applying assumed modes method and Lagrange Principle. In addition, the crack model is based on the Strain Energy Release Rate (SERR) concept in fracture mechanics. Finally, the method is synthesized via harmonic balance and numerical examples for a shaft/disk system demonstrate the effectiveness in detecting both location and severity of the structural damage.

Paper Details

Date Published: 3 April 2015
PDF: 11 pages
Proc. SPIE 9435, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2015, 943538 (3 April 2015); doi: 10.1117/12.2084311
Show Author Affiliations
Jie Zhao, The Univ. of Tennessee Knoxville (United States)
Hans DeSmidt, The Univ. of Tennessee Knoxville (United States)
Wei Yao, The Univ. of Tennessee Knoxville (United States)


Published in SPIE Proceedings Vol. 9435:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2015
Jerome P. Lynch, Editor(s)

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