Wavelet analysis of bender element signals

J Bonal, Shane Donohue, C McNally

Research output: Contribution to journalArticle

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Abstract

Accurate determination of shear wave arrival time using bender elements may be severely affected by a combination of near-field effects and reflected waves. These may mask the first arrival of the shear wave, making its detection difficult in the time domain. This paper describes an approach for measuring the shear wave arrival time through analysis of the output signal in the time-scale domain using a multi-scale wavelet transform. The local maxima lines of the wavelet transform modulus are observed at different scales, and all singularities are mathematically characterised, allowing subsequent detection of the singularity relating to the first arrival. Examples of the use of this approach on typical synthetic and experimental bender element signals are also supplied, and these results are compared with those from other time and frequency domain approaches. The wavelet approach is not affected by near-field effects, but instead is characterised by a relatively consistent singularity related to the shear wave arrival time, across a range of frequencies and noise levels.
LanguageEnglish
Pages243-252
Number of pages10
JournalGeotechnique
Volume62
Issue number3
DOIs
StatusPublished - 1 Mar 2012

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Wavelet analysis
Shear waves
wavelet analysis
S-wave
arrival time
wavelet
Wavelet transforms
transform
Masks
timescale
effect
detection

Cite this

Bonal, J., Donohue, S., & McNally, C. (2012). Wavelet analysis of bender element signals. DOI: 10.1680/geot.9.P.052

Wavelet analysis of bender element signals. / Bonal, J; Donohue, Shane; McNally, C.

In: Geotechnique, Vol. 62, No. 3, 01.03.2012, p. 243-252.

Research output: Contribution to journalArticle

Bonal, J, Donohue, S & McNally, C 2012, 'Wavelet analysis of bender element signals' Geotechnique, vol. 62, no. 3, pp. 243-252. DOI: 10.1680/geot.9.P.052
Bonal J, Donohue S, McNally C. Wavelet analysis of bender element signals. Geotechnique. 2012 Mar 1;62(3):243-252. Available from, DOI: 10.1680/geot.9.P.052
Bonal, J ; Donohue, Shane ; McNally, C. / Wavelet analysis of bender element signals. In: Geotechnique. 2012 ; Vol. 62, No. 3. pp. 243-252
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