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Sound Radiation from a Surface of Porous Material

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The sound field radiated from a surface of porous material vibrating uniformly is theoretically analyzed. We adopt a capillary tube model as an analytical model of the porous material to calculate the interactive effects between the fluid in the pores and the solid frame of the porous material in motion. The radiated field is obtained by solving the boundary value problem in a whole space including the internal region of the vibrating porous material and the external region where the sound waves are radiated. The efficiency coefficients of radiation and the sound absorption coefficients of the porous material in a few examples of a one-dimensional problem are numerically calculated and their frequency responses are presented graphically.

Zusammenfassung

Das von einer gleichmäßig schwingenden Oberfläche aus porösem Material abgestrahlte Schall, feld wird theoretisch analysiert. Zur Berechnung der Wechselwirkung zwischen der Flüssigkeit in den Poren und dem starren Rahmen aus bewegtem, porösem Material wird ein Kapillarröhren-Modell als analytisches Modell des porösen Materials herangezogen. Das abgestrahlte Feld erhält man durch Lösung der Randwertprobleme für den gesamten Raum, der sowohl die Innenzone des schwingenden, porösen Materials als auch das äußere Gebiet, in das die Schallwellen abgestrahlt werden, einschließt. An einigen Beispielen für das eindimensionale Problem werden die Wirkungsgrade der Abstrahlung und die Schallabsorptionsgrade des porösen Materials numerisch berechnet und ihre Frequenzverläufe graphisch angegeben.

Sommaire

On a étudié par la théorie le champ sonore émis par une surface limitant un matériau poreux vibrant uniformément. Le modèle des tubes capillaires a servi à modéliser analytiquement le matériau poreux en vue de calculer les effets d'interaction entre le fluide dans les pores et la matrice solide en mouvement. Le champ rayonné est obtenu en résolvant les problèmes aux limites dans l'espace comprenant la région intérieure au matériau poreux et la région externe où s'observe le champ rayonné. Dans quelques exemples unidimensionnels on a pu calculer numériquement les coefficients d'efficacité du rayonnement et les coefficients d'absorption acoustique du matériau poreux et établir les graphiques de leurs variations en fréquence.
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Document Type: Research Article

Publication date: June 1, 1980

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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