Thèse soutenue

= Evaluation de l'absorption acoustique de matériaux absorbants : utilisation d'une méthode de Trefftz et d'un nouveau capteur mixte de vitesse particulaire et de pression

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Auteur / Autrice : Reinhilde Lanoye
Direction : Gerrit VermeirWalter LauriksFranck Sgard
Type : Thèse de doctorat
Discipline(s) : Acoustique
Date : Soutenance en 2007
Etablissement(s) : Lyon, INSA en cotutelle avec Katholieke Universiteit Leuven (K.U.Leuven), Belgique

Mots clés

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Mots clés contrôlés

Résumé

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Porous absorbing materials are applied in various fields of sound and noise control. The presented work wants to deliver a numerical simulation tool to predict the acoustical behavior of geometrically complex sound absorbing media under various excitations. To achieve this goal, a deterministic method, which is based on the indirect Trefftz's method and which makes use of solution functions of the governing equations to describe the field variables int he region of interest, is extented to analyze the sound field in and above porous absorbers. The model is experimentally validated and used to analyze the sound field in some real-life configurations. Afterwards, an initial impetus is given towards the further analysis of the absorption performance of various kinds of patchworks under different angles of sound incidence and the study of sound propagation over impedance jumps, with the aid of a model applicable to unbounded problems. Besides the development of the simulation tool, a new dual particle velocity-pressure measurement technique is presented.