Quantitative assessment of damage in a structural beam based on wave propagation by impact excitation

Zhongqing Su, Lin Ye, Xiongzhu Bu, Xiaoming Wang, Yiu Wing Mai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)


A damage identification system involving a surface-attached piezoelectric transducer was developed in this study in correlation with an elastic wave propagation model. A signal processing and identification algorithm in the time-frequency domain based on the wavelet transform technique was proposed to suppress the diverse broadband interferences and effectively extract useful diagnostic information from the acquired raw impact responses, facilitating a prompt yet accurate structural health assessment. The developed system was then validated by applying it to a defective metal beam bearing a transverse crack with an increasing depth that simulates the crack growth. It is shown that the monitoring for the variable damage severity in the one-dimensional structure can be fulfilled quantitatively and exactly using this technique.
Original languageEnglish
Pages (from-to)27-40
Number of pages14
JournalStructural Health Monitoring
Issue number1
Publication statusPublished - 1 Dec 2003
Externally publishedYes


  • Impact response
  • Signal processing
  • Structural health monitoring (SHM)
  • Wave propagation
  • Wavelet transform

ASJC Scopus subject areas

  • Biophysics
  • Mechanical Engineering


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