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Experimental Analysis of a Model Based Crack Identification Approach for Rotating Machines

[+] Author Affiliations
Aldemir Ap Cavalini, Jr, Leonardo Sanches, Valder Steffen, Jr.

Federal University of Uberlândia, Uberlândia, MG, Brazil

Paper No. DETC2014-34485, pp. V008T11A062; 10 pages
doi:10.1115/DETC2014-34485
From:
  • ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 8: 26th Conference on Mechanical Vibration and Noise
  • Buffalo, New York, USA, August 17–20, 2014
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4641-4
  • Copyright © 2014 by ASME

abstract

In this paper an experimental application of a crack identification methodology based on combinational resonances is proposed. The technique uses external applied diagnostic forces at combinational frequencies, together with a pseudorandom optimization code, Differential Evolution, in order to characterize the signatures of the crack in the spectral responses of the flexible rotor. A finite element model is used to obtain the dynamic responses of the rotating machine. In this system, the additional excitations are applied by means an electrodynamic shaker. The method of multiple scales is used to determine the frequency of the excitation force under which combinational resonances appear. The breathing crack is simulated according to the Mayes model, in which the crack transition from fully opened to fully closed is described by a cosine function. The additional flexibility introduced by the crack is calculated by using the linear fracture mechanics theory. The results show that the methodology is a promising tool for estimates the crack location and depth.

Copyright © 2014 by ASME

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