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Analyse paramétrée des courbes d'absorption de produits fibreux en incidence normale

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Delany and Bazley [1] and Mechel [2] have proposed formulae allowing the determination of the acoustical characteristics of a fibrous material by relating to the specific air flow resistance.

The evaluation of the normal incidence absorption coefficient of a homogeneous fibious material backed by a reflecting surface, using these formulae, shows that the absorption coefficient as a function of frequency forms one of a family of curves depending on two parameters: the total air flow resistance of the product which determines the shape of the curve and the specific air flow resistance of the material which determines the position of the curve on the frequency axis.

Sommaire

Delany et Bazley [1] puis Mechel [2] ont proposé des relations permettant, à partir de la résistance spécifique au passage de l'air d'un matériau fibreux, de déterminer les caractéristiques acoustiques de ce matériau.

En utilisant ces relations pour calculer le coefficient d'absorption en incidence normale d'un produit fibreux homogène adossé à une paroi rigide on montre que les courbes du coefficient d'absorption en fonction de la fréquence font partie d'une famille à deux paramètres: la résistance totale au passage de l'air du produit qui conditionne la forme de la courbe, et la résistance spécifique au passage de l'air du matériau qui conditionne le positionnement de cette courbe en fréquence.

Zusammenfassung

Delany und Bazley [1] und danach Mechel [2] haben Beziehungen angegeben, welche die Bestimmung der akustischen Eigenschaften eines Fasermaterials aus seinem spezifischen Strömungswiderstand erlauben.

Diese Beziehungen weiden zur Berechnung des Absorptionsgrads eines homogenen Fasermaterials vor einer starren Wand bei senkrechtem Einfall benutzt. Damit wird gezeigt, daß die Kurven des Absorptionsgrads in Abhängigkeit von der Frequenz eine von zwei Parametern abhängige Schar bilden: dem gesamten Strömungswiderstand, der die Form der Kurve bestimmt, und dem spezifischen Strömungswiderstand des Materials, der die Lage dieser Kurve bezüglich der Frequenz bestimmt.
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Document Type: Research Article

Publication date: February 1, 1983

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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