An improved technique for modal decomposition of a double-mode Lamb wave signal

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

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

Abstract

This study develops a technique to decompose a multi-mode, transient Lamb wave signal into individual Lamb mode signals. The previously-proposed technique (presented at the SPIE NDE conference 2005) showed an encouraging efficiency for numerically-simulated signals, but suffered when evaluating real experimental signals due to its high sensitivity to noises and experimental errors, The improved technique starts with the same assumption of known Lamb wave propagation characteristics (known propagation dispersion curves). However, a highly-strict signal model governing the development of the previously-proposed technique is relaxed to tolerate unavoidable presence noises and errors, and the problem is re-formulated. For actual experimental signals, some additional signal processing techniques are introduced in signal pre-conditioning. The entire implementation of the improved technique is first tested with simulated signals, and then applied to actual experimental signals. The final results with real experimental are presented and discussed.

Original languageEnglish
Title of host publicationNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
DOIs
StatePublished - 2006
EventNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V - San Diego, CA, United States
Duration: 28 Feb 20062 Mar 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6176
ISSN (Print)0277-786X

Conference

ConferenceNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
Country/TerritoryUnited States
CitySan Diego, CA
Period28/02/062/03/06

Keywords

  • Double-mode Lamb waves
  • Modal decomposition
  • Signal processing technique

Fingerprint

Dive into the research topics of 'An improved technique for modal decomposition of a double-mode Lamb wave signal'. Together they form a unique fingerprint.

Cite this