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Fault Feature Analysis of Rotor System With Looseness Fault

[+] Author Affiliations
Hui Ma, Wei Sun, Jishuang Dai, Bangchun Wen, Zongyan Wang

Northeastern University, Shenyang, Liaoning, China

Paper No. DETC2009-86647, pp. 1073-1077; 5 pages
doi:10.1115/DETC2009-86647
From:
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME

abstract

Focusing on pedestal looseness fault often occurring in practical engineering, a new looseness model is presented by considering respective advantages and disadvantages of all kinds of pedestal looseness model. By using finite element method, the looseness fault is simulated and the fault features are obtained. The simulation results show that when the amplitude of equivalent looseness mass is less than the looseness clearance, the system motion is from period-one through period-two to period-four, amplitudes of low frequency components gradually increase and the axis orbit changes from ellipse to twist with the decrease of looseness stiffness. When the amplitude of equivalent looseness mass is greater than the looseness clearance, high multiple frequency components and continuous spectra appear and axis orbit is similar to a trapezoid due to axis motion restrained by bilateral constraint. These fault features that obtained in different conditions are helpful to diagnose pedestal looseness fault in rotor system.

Copyright © 2009 by ASME
Topics: Rotors

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