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.
Malatesta M.M., Testoni N., Marzani A., De Marchi L. (2020). Guided Waves Direction of Arrival Estimation Based on Calibrated Multiresolution Wavelet Analysis. Springer [10.1007/978-3-030-37277-4_42].
Guided Waves Direction of Arrival Estimation Based on Calibrated Multiresolution Wavelet Analysis
Malatesta M. M.;Testoni N.;Marzani A.;De Marchi L.
2020
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
