Guided Waves Direction of Arrival Estimation Based on Calibrated Multiresolution Wavelet Analysis
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Damages produced by impacts can compromise structural integrity. Precise localization of the damage is fundamental to improve structural monitoring systems accuracy and reliability. A method based on the estimation of elastic waves Direction of Arrival (DoA) in plate-like structures by means of a DFT-Based Continuous Wavelet Transform (CWT) decomposition is proposed. To tackle the dispersive behaviour of guided waves, simultaneous multiband signal filtering in the Wavelet domain is performed. Subsequently, the cross-correlation method is applied to each computed scale to evaluate the Difference Time of Arrival (DToA). Finally, DoA is extracted applying an averaging procedure across scales to the arc-tangent of the ratio between the DToA among specific active areas of the sensors. This approach has been experimentally validated through measurements on an aluminum plate, after a calibration stage was performed.
KeywordsGuided waves Localization algorithm Lamb waves Continuous wavelet transform PZT transducers Calibration
This research has been funded by INAIL within the framework BRIC/2016 ID = 15, SMARTBENCH project.
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