Nonlinear Time Reversal Tomography of Structural Defects

0334392 - ÚT 2010 RIV US eng J - Článek v odborném periodiku
Vejvodová, Šárka - Převorovský, Zdeněk - Dos Santos, S.
Nonlinear Time Reversal Tomography of Structural Defects.
POMA. Roč. 3, č. 1 (2009), 045003-045010. ISSN N.
[ICNEM /14/. Lisabon, 01.06.2009 - 06.06.2009]
Grant CEP: GA ČR GA106/07/1393; GA MPO(CZ) FR-TI1/198
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: nonlinear elastic wave spectroscopy (NEWS) * DORT method * time reversal (TR)
Kód oboru RIV: BI - Akustika a kmity
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PMARCW000003000001045003000001&idtype=cvips&gifs=yes

A modification of TR-NEWS is proposed in this paper, referred to as Nonlinear Time Reversal Tomography. The procedure uses transducer array providing improvement of damaged zone localization. DORT method, enhanced by focused beams and virtual transducers concepts (FDORT) is used to derive Green’s function of defects. The TR-NEWS procedure is completed by the Excitation Symmetry Analysis Method (ESAM) as to extract 3rd order nonlinearities from spectral matrices along different wave-paths. Test results, obtained on metallic and composite parts, illustrate performance of the proposed procedure. Advantages of TR-NEWS tomography are in their potentiality to acquire very complex information about the tested structure.
Trvalý link: http://hdl.handle.net/11104/0179140