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

Maosen Cao, Xueguan Song, Wei Xu, Zhongqing Su, Weidong Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

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. JOURNAL OF VIBROENGINEERING. MARCH 2014.
Original languageEnglish
Pages (from-to)1010-1021
Number of pages12
JournalJournal of Vibroengineering
Volume16
Issue number2
Publication statusPublished - 1 Jan 2014

Keywords

  • Beam
  • Crack modeling
  • Damage assessment
  • Fracture mechanics
  • Natural frequency
  • Noise effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering

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