Lamb wave testing for SHM is complicated by multimodal propagation and by reflections. In this paper, the effectiveness of the decomposition inWarped Curvelet Frames for the analysis of guided ultrasonic waves is studied. The transformation acts by expanding the analyzed signal into a tight frame of basis functions named Curvelets. The curvelet transform may be effectively combined with warping procedures to analyze wave propagation in dispersive media. Experimental results show that, thanks to the spatial and temporal localization of curvelets, it is possible to decompose waves that are overlapped both in the time/space and in the frequency/wavenumber domain.
L. De Marchi, E. Baravelli, M. Ruzzene, N. Speciale (2011). Guided waves filtering with Warped Curvelets. s.l : s.n.
Guided waves filtering with Warped Curvelets
DE MARCHI, LUCA;BARAVELLI, EMANUELE;SPECIALE, NICOLO'ATTILIO
2011
Abstract
Lamb wave testing for SHM is complicated by multimodal propagation and by reflections. In this paper, the effectiveness of the decomposition inWarped Curvelet Frames for the analysis of guided ultrasonic waves is studied. The transformation acts by expanding the analyzed signal into a tight frame of basis functions named Curvelets. The curvelet transform may be effectively combined with warping procedures to analyze wave propagation in dispersive media. Experimental results show that, thanks to the spatial and temporal localization of curvelets, it is possible to decompose waves that are overlapped both in the time/space and in the frequency/wavenumber domain.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
