Damage identification using electromagnetic waves based on born imaging algorithm / Saeed Nojavan in Journal of engineering mechanics, Vol. 135 N° 7 (Juillet 2009)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 135 N° 7 (Juillet 2009) . - pp. 717-728 Titre : Damage identification using electromagnetic waves based on born imaging algorithm Type de document : texte imprimé Auteurs : Saeed Nojavan, Auteur ; Fuh-Gwo Yuan, Auteur Article en page(s) : pp. 717-728 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Imaging techniques Damage Assessments Finite difference method Microwave Algorithms. Résumé : Reconstructing damage geometry with computationally efficient and effective algorithms is of primary importance in establishing a robust structural health monitoring (SHM) system. In this paper, Born imaging algorithm is proposed for three-dimensional (3D) damage imaging of reinforced concrete structures using electromagnetic waves. This algorithm is derived in time domain for inhomogeneous isotropic and lossy structures. In order to reduce the computational cost of the algorithm, different imaging conditions are introduced. Numerical simulations in a 2D transverse magnetic case for a reinforced concrete slab with multiple damages are performed to test the effectiveness of the algorithm. In this simulated study, sensor data, incident field, and back-propagated field are computed via a finite difference time-domain method. It is concluded that the proposed imaging algorithm is capable of efficiently identifying the damages' geometries and may be employed in a SHM system. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Damage identification using electromagnetic waves based on born imaging algorithm [texte imprimé] / Saeed Nojavan, Auteur ; Fuh-Gwo Yuan, Auteur . - pp. 717-728. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 7 (Juillet 2009) . - pp. 717-728 Mots-clés : Imaging techniques Damage Assessments Finite difference method Microwave Algorithms. Résumé : Reconstructing damage geometry with computationally efficient and effective algorithms is of primary importance in establishing a robust structural health monitoring (SHM) system. In this paper, Born imaging algorithm is proposed for three-dimensional (3D) damage imaging of reinforced concrete structures using electromagnetic waves. This algorithm is derived in time domain for inhomogeneous isotropic and lossy structures. In order to reduce the computational cost of the algorithm, different imaging conditions are introduced. Numerical simulations in a 2D transverse magnetic case for a reinforced concrete slab with multiple damages are performed to test the effectiveness of the algorithm. In this simulated study, sensor data, incident field, and back-propagated field are computed via a finite difference time-domain method. It is concluded that the proposed imaging algorithm is capable of efficiently identifying the damages' geometries and may be employed in a SHM system. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

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