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Time reversal based news methods for localization and classification of nonlinear vibrations in bio-mechanical media
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SYSNO ASEP 0423164 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Time reversal based news methods for localization and classification of nonlinear vibrations in bio-mechanical media Tvůrce(i) Dos Santos, S. (FR)
Farová, Zuzana (UT-L) RID
Kůs, V. (CZ)
Převorovský, Zdeněk (UT-L) RIDZdroj.dok. 20th International Congress on Sound & Vibration : ICSV 20. - Bangkok : International Institute of Acoustics and Vibration, 2013 / Crocker M.J. ; Pawelczyk M. - ISSN 2329-3675 - ISBN 978-616-551-682-2 Rozsah stran s. 1-8 Poč.str. 8 s. Forma vydání Tištěná - P Akce International Congress on Sound & Vibration /20./ Datum konání 07.07.2013-11.07.2013 Místo konání Bangkok Země TH - Thajsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. TH - Thajsko Klíč. slova time reversal ; statistical classification ; chirp excitation Vědní obor RIV BB - Aplikovaná statistika, operační výzkum Institucionální podpora UT-L - RVO:61388998 Anotace Non Destructive Testing (NDT) and harmonic medical imaging methods have been widely developed thanks to the use of the symbiosis of Time Reversal (TR) based signal processing tools and Nonlinear Elastic Wave Spectroscopy (NEWS) methods. Statistical methods for classification, identification and localization were developed in order to detect, localize and calibrate nonlinear scatterers responsible of the structural degradation of materials. The classification of nonlinear vibrations is performed by means of a fuzzy classification method, in which parameters are extracted from the ultrasonic response containing acoustic nonlinearities. According to the classification results, several types of nonlinearities extracted with Pulse Inversion (PI) based methods are identified, and position of the scattered sources are found. The experimental feasibility of a focused TR-NEWS method has been improved with a set-up taking into account new advanced chirpcoded excitations, and new statistical classification. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2014
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