Journal
JOURNAL OF SOUND AND VIBRATION
Volume 400, Issue -, Pages 317-328Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2017.04.017
Keywords
Guided wave tomography; Accuracy analysis; Full waveform inversion
Categories
Funding
- Energy Innovation Research Programme (EIRP) [NRF2014EWT-EIRP003-010]
- Energy Innovation Programme Office
- National Research Foundation (NRF)
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Guided wave tomography is a promising tool to accurately determine the remaining wall thicknesses of corrosion damages, which are among the major concerns for many industries. Full Waveform Inversion (FWI) algorithm is an attractive guided wave tomography method, which uses a numerical forward model to predict the waveform of guided waves when propagating through corrosion defects, and an inverse model to reconstruct the thickness map from the ultrasonic signals captured by transducers around the defect. This paper discusses the reconstruction accuracy of the FWI algorithm on plate-like structures by using simulations as well as experiments. It was shown that this algorithm can obtain a resolution of around 0.7 wavelengths for defects with smooth depth variations from the acoustic modeling data, and about 1.5-2 wavelengths from the elastic modeling data. Further analysis showed that the reconstruction accuracy is also dependent on the shape of the defect. It was demonstrated that the algorithm maintains the accuracy in the case of multiple defects compared to conventional algorithms based on Born approximation. (C) 2017 Elsevier Ltd. All rights reserved.
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