Time-frequency representations of Lamb waves

Marc Niethammer, Laurence J. Jacobs, Jianmin Qu, Jacek Jarzynski

Research output: Contribution to journalArticlepeer-review

253 Scopus citations

Abstract

The objective of this study is to establish the effectiveness of four different time-frequency representations (TFRs) - the reassigned spectrogram, the reassigned scalogram, the smoothed Wigner-Ville distribution, and the Hilbert spectrum - by comparing their ability to resolve the dispersion relationships for Lamb waves generated and detected with optical techniques. This paper illustrates the utility of using TFRs to quantitatively resolve changes in the frequency content of these nonstationary signals, as a function of time. While each technique has certain strengths and weaknesses, the reassigned spectrogram appears to be the best choice to characterize multimode Lamb waves.

Original languageEnglish
Pages (from-to)1841-1847
Number of pages7
JournalJournal of the Acoustical Society of America
Volume109
Issue number5 I
DOIs
StatePublished - 2001

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