Extension d'une methode de modification structurale pour la conception de dispositifs dissipatifs integrant des materiaux viscoelastiques

Abstract : The aim of this work is to extend the use of a structural dynamic modification method to cases of damping device design. These devices are meant to improve the mechanical behaviour of some structures used by EDF (Electricité de France). The first step of the work is to give theoretical bases on the modelling of heavily damped structures and especially viscoelastic ones. One then performs a design study for an experimental testbed that is representative of structures EDF wants to treat. The performance of the damping device is evaluated experimentally and compared with the numerical results. This numerical design study highlights the limitations of classical design methods in the context of industrial exploitation of EDF (non updated models, complex structures, access to measurements limited). The second part of the work thus deals with the adaptation of a structural dynamic modification method to the case of the proposed damped modification. The chosen method is based on a modal coupling formulation that has been tested within EDF on undamped applications. But the method needs some adaptations because of the use of damping terms in equations and the fact that the mechanical behaviour is frequency dependant (a characteristic of viscoelastic materials). The robustness of the method is then analyzed through some points that are important for its application. The method is experimentally validated through the testbed.
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Submitted on : Wednesday, June 4, 2008 - 2:09:41 PM
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Benjamin Groult. Extension d'une methode de modification structurale pour la conception de dispositifs dissipatifs integrant des materiaux viscoelastiques. Mécanique [physics.med-ph]. Ecole Centrale Paris, 2008. Français. ⟨tel-00285042⟩

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