Modal decomposition of double-mode Lamb waves

K. Luangvilai, L. J. Jacobs, J. Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This research proposes a technique to decompose a transient, multi-mode, Lamb wave, time-domain signal into its individual Lamb wave modes. The technique is derived for a plane-strain Lamb wave signal consisting of two Lamb wave modes (double-mode Lamb wave signal). The proposed technique assumes knowledge of the propagation dispersion characteristics of Lamb waves, i.e. relationships between frequency and the real part of wavenumber of existing modes. These relationships can be obtained by other signal processing techniques such as the two-dimensional Fourier transform or the short-time Fourier transform. The proposed technique is verified for simulated signals to demonstrate the method's accuracy in an almost-ideal situation. The simulation uses eigen-expansion method for calculation of the total response as a combination of responses due to all existing Lamb modes. The comparison between the decomposed and simulated signals demonstrates the validity of the proposed technique.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25A
Pages633-640
Number of pages8
DOIs
StatePublished - 6 Mar 2006
EventReview of Progress in Quantitative Nondestructive - Brunswick, ME, United States
Duration: 31 Jul 20055 Aug 2005

Publication series

NameAIP Conference Proceedings
Volume820 I
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceReview of Progress in Quantitative Nondestructive
Country/TerritoryUnited States
CityBrunswick, ME
Period31/07/055/08/05

Keywords

  • Decomposition
  • Double-mode Lamb waves

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