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Defect localization in metal plates using vibroacoustic modulation
Citation Link: https://doi.org/10.15480/882.8986
Publikationstyp
Journal Article
Date Issued
2023-07-16
Sprache
English
TORE-DOI
Journal
Volume
1
Issue
1
Start Page
3
End Page
21
Citation
NDT 1 (1): 3-21 (2023)
Publisher DOI
Publisher
Multidisciplinary Digital Publishing Institute
Peer Reviewed
true
This paper reviews the state-of-the-art approaches in defect localization and specifies the remaining questions and challenges. Furthermore, this study presents a novel defect localization methodology using the nonlinear interaction of primary Lamb wave modes and vibroacoustic modulation (VAM), combined with damage imaging, to address the current shortcomings of defect localization. The study investigates this methodology experimentally with respect to defect interpretation, resolution, and applicability. Two Lamb waves with high and low frequencies, one being continuous and the other a tone burst, were excited using two different piezoelectric sensors. The amplitude of the measured signal at the first sideband frequency was evaluated with a short-time Fourier transform (STFT) and used for damage imaging via the delay and sum method. This study also includes a discussion on identifying the source of nonlinearity reflected in the first sideband. The experimental measurements prove that the localization of defect nonlinearity is possible with high accuracy, without the need for a baseline measurement, and with a minimum number of sensors. Sensitivity measurements with respect to the required length of the high-frequency tone burst and the sensor arrangement were also conducted.
Subjects
baseline-free
damage imaging
damage localization
Lamb waves
piezoelectric
short-time Fourier transform
tone burst
vibroacoustic
DDC Class
620: Engineering
Publication version
publishedVersion
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ndt-01-00002.pdf
Type
Main Article
Size
8.06 MB
Format
Adobe PDF