Počet záznamů: 1

Nonlinear elastic wave spectroscopy in symbiosis with time reversal for localization of defects: TR-NEWS

  1. 1.
    0334347 - UT-L 2010 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
    Dos Santos, S. - Vejvodová, Šárka - Převorovský, Zdeněk
    Nonlinear elastic wave spectroscopy in symbiosis with time reversal for localization of defects: TR-NEWS.
    NDT in PROGRESS. Brno: University of Technology Brno, 2009 - (Mazal, P.), s. 27-36. ISBN 978-80-214-3968-9.
    [NDT in Progress /5./. Praha (CZ), 12.10.2009-14.10.2009]
    Grant CEP: GA ČR GA106/07/1393; GA MPO(CZ) FR-TI1/274
    Výzkumný záměr: CEZ:AV0Z20760514
    Klíčová slova: nonlinear elastic wave spectroscopy(NEWS) * ESAM * time reversal (TR) * TR-NEWS imaging * tomography
    Kód oboru RIV: BI - Akustika a kmity

    Using the symmetry invariance and reciprocity the classical NEWS methods are supplemented and improved by practically elaborated TR-NEWS procedure having the intrinsic property of enlarging frequency analysis bandwidth. Coded excitations have been generalized using Symmetry Analysis ESAM (Excitation Symmetry Analysis Method), including also the chirp-coded excitation, which improves the signal to noise ratio and enables harmonic imaging of complex specimen. In this paper, we propose a new NDT application of the above approaches implemented on a composite specimen with adhesive joints. The calibrated chirp-coded TR-NEWS imaging of the sample is obtained by using the symmetrical excitations, and pre- and post- signal processing. Localization of the scatterer is illustrated on 2D plot.
    Trvalý link: http://hdl.handle.net/11104/0179107