Amélioration de méthodes de modification structurale par utilisation de techniques d'expansion et de réduction de modèle.

Abstract : This work deals with the improvements of methods devoted to estimate the influence of modifications on the dynamic behaviour of a structure (addition of stiffeners or masses, boundary condition changes). The input data for the method are an experimentally derived model of the initial structure and a numerical model of the modification. Based on a coarse model of the structure to be modified, the proposed methodology tackles two major difficulties : efficient predictions for distributed modifications and handling of the lack of measurement points on the coupling interface. In addition, displacements bases introduced to reconstruct unmeasured behaviour of the interface limit error propagation through the process. Moreover, two indicators are introduced to select the optimal prediction. A number of industrial examples illustrate the performance of this approach, in terms of reactivity as well as quality of the predictions of dynamic behaviour.
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Mathieu Corus. Amélioration de méthodes de modification structurale par utilisation de techniques d'expansion et de réduction de modèle.. Mécanique [physics.med-ph]. Ecole Centrale Paris, 2003. Français. ⟨tel-00011298⟩

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