Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/84939
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Type: | Journal article |
Title: | On the selection of advanced signal processing techniques for guided wave damage identification using a statistical approach |
Author: | Ng, C. |
Citation: | Engineering Structures, 2014; 67:50-60 |
Publisher: | Elsevier |
Issue Date: | 2014 |
ISSN: | 0141-0296 1873-7323 |
Statement of Responsibility: | Ching-Tai Ng |
Abstract: | The current study proposed a statistical approach to the identification of structural damages using guided waves. Various signal processing techniques were applied in order to determine and improve the ways in which damage in a structure can be identified for remediation. The proposed statistical approach not only provides a quantitative identification of the damages, but can also quantify the uncertainties associated with the damage identification results. This allows the performance of various signal processing techniques to be evaluated and compared in terms of accuracy and the degree of uncertainty associated with the damage identification results. Damage identification was initially conducted using time domain guided wave signals so that the results could be used as a benchmark. Four signal processing techniques were then considered. Hilbert transform was used to extract the signal envelopes. Fast Fourier transform was applied to transform the guided wave signals from the time domain to the frequency domain. Gabor wavelet transform was employed to extract the wavelet coefficients from time-frequency domain. Discrete wavelet transform was used to decompose the guided wave signals. The frequency domain signal, signal envelopes, wavelet coefficients and discrete wavelet decomposed signals were then employed separately to identify the damages in conjunction with the proposed statistical damage identification approach. Laboratory experiments were conducted and the data were used to verify the proposed statistical approach. The levels of accuracy and degree of uncertainty associated with the damage identification results by each of the signal processing techniques were compared in detail. The results reported in this paper show that a suitable signal processing technique combined with the proposed statistical approach produces more robust identification of damages in a structure. © 2014 Elsevier Ltd. |
Keywords: | Damage identification; Statistical approach; Signal processing; Fourier transform; Hilbert transform; Wavelet transform; Guided waves; Probability density function |
Rights: | Copyright © 2014 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.engstruct.2014.02.019 |
Grant ID: | http://purl.org/au-research/grants/arc/DE130100261 |
Published version: | http://dx.doi.org/10.1016/j.engstruct.2014.02.019 |
Appears in Collections: | Aurora harvest 7 Civil and Environmental Engineering publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_84939.pdf | Accepted version | 1.77 MB | Adobe PDF | View/Open |
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