caa a22 4500 606173153 CHVBK 20210128100731.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10921-015-0279-7 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0279-7 Nonlinear Imaging Method Using Second Order Phase Symmetry Analysis and Inverse Filtering [Elektronische Daten] [Francesco Ciampa, Gennaro Scarselli, Michele Meo] This paper presents a nonlinear imaging method based on nonlinear elastic guided waves, for the damage detection and localisation in a composite laminate. The proposed technique relies on the study of the structural nonlinear responses by means of a combination of second order phase symmetry analysis (PSA) with chirp excitation and inverse filtering (IF) method. PSA was used to exploit the invariant properties of the propagating elastic waves with the phase angle of the pulse compressed chirp signals, in order to characterise the second order nonlinear behaviour of the medium. Then, the IF approach was applied to a library of second order nonlinear responses to obtain a two-dimensional image of the damage. The experimental tests carried out on an impact damage composite sample were compared to standard C-scan. The results showed that the present technique allowed achieving the optimal focalisation of the nonlinear source in the spatial and time domain, by taking advantage of multiple scattering and a small number of receiver sensors. Springer Science+Business Media New York, 2015 Delamination nationallicence Nonlinear acoustics nationallicence Inverse filtering nationallicence Ciampa Francesco Department of Mechanical Engineering, Material Research Centre, University of Bath, BA2 7AY, Bath, UK aut Scarselli Gennaro Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100, Lecce, Italy aut Meo Michele Department of Mechanical Engineering, Material Research Centre, University of Bath, BA2 7AY, Bath, UK aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-6 0195-9298 34:2<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0279-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0279-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ciampa Francesco Department of Mechanical Engineering, Material Research Centre, University of Bath, BA2 7AY, Bath, UK aut NATIONALLICENCE 700 1- Scarselli Gennaro Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100, Lecce, Italy aut NATIONALLICENCE 700 1- Meo Michele Department of Mechanical Engineering, Material Research Centre, University of Bath, BA2 7AY, Bath, UK aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-6 0195-9298 34:2<1 2015 34 10921