Nondestructive evaluation of in-isolation pile shaft integrity by wigner-ville distribution

S. H. Ni, J. J. Charng, K. F. Lo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The Wigner-Ville Distribution is a new numerical analysis tool for signal process technique in the time-frequency domain and it can offer assistance and enhance signal characteristics for better resolution both easily and quickly. Time-frequency transform can describe how a spectrum of signals changes with time owing to defects and boundary conditions. In this study, five single pre-cast concrete piles have been tested and evaluated by both sonic echo method and Wigner-Ville distribution (WVD). The appropriateness of time-frequency domain analysis is discussed. Furthermore, two difficult problems in nondestructive evaluation problems are discussed and solved: the first one is with a pile with slight defect, whose necking area percentage is less than 10%, and the other is a pile with multiple defects. The results show that WVD can not only recognize the characteristics easily, but also locate the defects more clearly than the traditional pile integrity testing method.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalJournal of Mechanics
Issue number1
Publication statusPublished - 2007 Mar

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics


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