Mesures en service et reconstruction de champs sur structures

Abstract : This thesis tackles the problem of structural monitoring from integrated measurements to full-field reconstruction. In a first part, the technology of measurement systems is studied. An integrated measurement system is specified from some structural tests in-service and its future applications. These specifications define the mechanical framework of structural monitoring. The inverse problem associated with structural monitoring is expressed in a second part. The mechanical hypothesis result from the previously defined framework. The boundary conditions are identified in order to reconstruct the mechanical fields. The loads are considered only and the Saint-Venant's principle allows to limit the number of the loading parameters. The main issue is then to find the right loading basis and to optimize the sensor locations. This method for structural monitoring is applied to beams in the third part. The analytical solutions of the mechanical equations for beams are projected on the boundary of the structures in order to obtain the loading basis. The optimal sensor locations are then estimate from elementary structures, what reduces the inverse problem to a polynomial identification. The complex beam structures are then decomposed into elementary ones, what drastically simplifies the construction of the loading basis and the sensor locations. In a last part, plate structures are considered. The loading basis are firstly defined by the projection of the analytical solutions of star-shaped domain. These basis are then extended to any plate structures using some loaded boundaries only in order to design an equivalent star-shaped domain. Even if these loading basis are incomplete sets, the results are in good agreement. The same principle is used to obtain the loading basis for complex structures modeled by plate assemblies.
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Contributor : Dominique Martini <>
Submitted on : Tuesday, December 20, 2011 - 3:30:53 PM
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  • HAL Id : tel-00653901, version 1



Dominique Martini. Mesures en service et reconstruction de champs sur structures. Mécanique des structures [physics.class-ph]. Université de Provence - Aix-Marseille I, 2011. Français. ⟨tel-00653901⟩



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