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Vibro-acoustics Substructuring: Combining simulations and experimental identification of subdomains for low frequency vehicle acoustics NATURE : Doctorat Numéro, pp.2018-109 ,
, Acoustique RESUME : La sonorité de l'échappement joue un rôle significatif sur le confort acoustique des occupants, ainsi que sur le caractère du véhicule. L'étude proposée porte sur la problématique industrielle suivante : « Description et quantification de la transmission du son entre la bouche d'échappement et l'intérieur du véhicule ». Physiquement la transmission sonore entre l'échappement et l'intérieur du véhicule s'effectue en trois étapes : Propagation des ondes sonores de la canule à la
, Le bruit structurel se propage de la peau extérieure du véhicule à l'habillage intérieur
, La surface intérieure du véhicule rayonne de l'énergie dans l'air à l'intérieur
, PTF) est considérée comme une alternative viable à la problématique proposée. Cependant, avant d'appliquer la méthode sur un véhicule complet, la problématique suivante devait être résolue : « Caractérisation expérimentale d'un sous-système par des mesures sur un système couplé ». Ce manuscrit propose une méthode originale pour mesurer des fonctions de transfert d'un système découplé, sur la base de la réponse d'un système couplé. En raison de la nature mal posée du problème inverse, une méthode originale de régularisation a été proposée
Sous-Structuration, vibro-acoustique, méthode hybride, méthode inverse, échappement, bourdonnement ,
, Guyader JeanLouis (Directeur de thèse), Totaro Nicolas (co-Directeur de thèse), Composition du jury : Leclaire Philippe (Rapporteur)