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.
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ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 17–20, 2014
Buffalo, New York, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-4641-4
PROCEEDINGS PAPER
Experimental Analysis of a Model Based Crack Identification Approach for Rotating Machines
Aldemir Ap Cavalini, Jr,
Aldemir Ap Cavalini, Jr
Federal University of Uberlândia, Uberlândia, MG, Brazil
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Leonardo Sanches,
Leonardo Sanches
Federal University of Uberlândia, Uberlândia, MG, Brazil
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Valder Steffen, Jr.
Valder Steffen, Jr.
Federal University of Uberlândia, Uberlândia, MG, Brazil
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Aldemir Ap Cavalini, Jr
Federal University of Uberlândia, Uberlândia, MG, Brazil
Leonardo Sanches
Federal University of Uberlândia, Uberlândia, MG, Brazil
Valder Steffen, Jr.
Federal University of Uberlândia, Uberlândia, MG, Brazil
Paper No:
DETC2014-34485, V008T11A062; 10 pages
Published Online:
January 13, 2015
Citation
Cavalini, AA, Jr, Sanches, L, & Steffen, V, Jr. "Experimental Analysis of a Model Based Crack Identification Approach for Rotating Machines." Proceedings of the 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. V008T11A062. ASME. https://doi.org/10.1115/DETC2014-34485
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