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Performance assessment of natural frequencies in characterizing cracks in beams in noisy conditions

Lookup NU author(s): Dr Xueguan Song

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Abstract

Numerical cases of the use of natural frequencies to identify crack location and crack depth in beams under noise-free conditions have been widely reported. However, the capability of natural frequencies to identify cracks in noisy conditions has not yet been systematically addressed. Unlike previous work stressing the merits of natural frequencies in depicting cracks, this study reports the performance assessment of natural frequencies in characterizing cracks in noisy conditions. In the performance assessment, a cracked cantilever Timoshenko beam, with the crack flexibility modeled by fracture mechanics principles, is considered. The results demonstrate quantitatively and exhaustively that natural frequencies, as global dynamic properties of a structure, are somewhat insensitive to local slight damage. The outcome of this study provides a guideline for rational use of natural frequencies to identify cracks in actual beam-type structures.

Publication metadata

Author(s): Cao MS, Song XG, Xu W, Su ZQ, Zhu WD

Publication type: Article

Publication status: Published

Journal: Journal of Vibroengineering

Year: 2014

Volume: 16

Issue: 2

Pages: 1010-1021

Print publication date: 01/03/2014

Acceptance date: 01/01/1900

ISSN (print): 1392-8716

ISSN (electronic):

Publisher: Public Institution Vibromechanika

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