METHODES D'ANALYSE DES DEFORMEES MODALES PAR TRAITEMENT DU SIGNAL POUR LE DIAGNOSTIC IN SITU DE STRUCTURES

Abstract : This thesis deals with nondestructive evaluation in civil engineering and more particularly with in situ structural diagnosis. Our objective is twofold :
to study the theoretical aspect of damage detection and characterization using modal analysis data only and to identify the best experimental tool to acquire accurate modal data. To reach this goal we develop methods of mode shape analysis by signal processing in order to characterize the structural defects but also to establish a classification of the connections (joint or boundary conditions). We also have developed numerical tools for simulation (FEM) and algorithms of analysis (wavelets, fractal dimension, neural networks) under Matlab in order to automate the diagnosis. The validation was carried out on simulated mode shapes but also on mode shapes resulting from the bibliography and finally on experimental mode shapes of a portal frame (acquired by a scanning laser vibrometer).
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Contributor : Joseph Morlier <>
Submitted on : Tuesday, June 6, 2006 - 11:42:23 AM
Last modification on : Monday, February 11, 2019 - 5:02:01 PM
Long-term archiving on: Tuesday, September 18, 2012 - 11:30:09 AM

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Joseph Morlier. METHODES D'ANALYSE DES DEFORMEES MODALES PAR TRAITEMENT DU SIGNAL POUR LE DIAGNOSTIC IN SITU DE STRUCTURES. Matériaux. Université Sciences et Technologies - Bordeaux I, 2005. Français. ⟨tel-00078449⟩

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