Champs de densité d'énergie pour la vibroacoustique basse et moyenne fréquence des structures complexes utilisant un modèle numérique stochastique : application à la partition structurale des automobiles

Abstract : This research lies in the domain of the vibroacoustic analysis of complex structures. It proposes a new energy approach using the energy-density field in order to simplify such an analysis. This approach is based on a stochastic computational model constructed using the nonparametric probabilistic approach of modeling and parameters uncertainties. The stochastic energy approach developed corresponds to a new representation of the vibroacoustic system in terms of random energy quantities. A mean vibroacoustic energy model is thus constructed using a statistical averaging of the random energy quantities. This mean energy model provides a tool to perform a vibroacoustic analysis of complex structures in the low and medium frequency range while the SEA is not adapted to this frequency band. The analysis of the properties of the mean energy quantities used for the construction of the vibroacoustic energy model allows the construction of a simplified model to be obtained and yields a simplified energy model for which a structural partitioning methodology is then established. An application of the energy approach ant of the structural partitioning methodology is done on an automotive vehicle structure coupled with its internal acoustic cavity
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Engineering Sciences. Université Paris-Est, 2009. French. <NNT : 2009PEST1061>


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Morad Kassem. Champs de densité d'énergie pour la vibroacoustique basse et moyenne fréquence des structures complexes utilisant un modèle numérique stochastique : application à la partition structurale des automobiles. Engineering Sciences. Université Paris-Est, 2009. French. <NNT : 2009PEST1061>. <tel-00539048>

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