Spectrotemporal analysis of guided-wave pulse-echo signals: Part 2. Numerical and experimental investigations

S. C. Wooh, K. Veroy

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Part 2 of this paper seeks the numerical and experimental procedures for implementing the Morlet wavelet transform for the spectrotemporal analysis of multimode dispersive waves. The sensitivity due to the spectral parameters α and wo, defining the bandwidth and center frequency of the mother wavelet, is studied through an error analysis of the simulation signals. The algorithm for determining the group delays is extended to multimode signals by introducing a thresholding technique. The ultimate goal of this study is to nondestructively detect and locate discontinuities in a thin plate. This is demonstrated by experimentally measuring the travel distance of a Lamb wave from a single waveform.

Original languageEnglish
Pages (from-to)332-342
Number of pages11
JournalExperimental Mechanics
Volume41
Issue number4
DOIs
Publication statusPublished - Dec 2001
Externally publishedYes

Bibliographical note

Funding Information:
This work was partially supported by the National Science Foundation (CMS-9733157).

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

  • Bandwidth
  • Group delays
  • Guided waves
  • Multimode dispersion
  • Thresholding
  • Wavelet transform

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