Shape and Size Design of Finite Plane Baffles —Theory of a Developed Doublet Model. Part I—

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Abstract:

The doublet model for a circular baffle is developed into the model which serves to estimate the axial response of an arbitrary shaped plane baffle. The resulting shape-to-response formula is solvable and is transformed into a response-to-shape design formula. The baffle size is determined when the lower cut-off frequency is specified. A formula expresses the mutual restriction among lowering the cut-off frequency, irregularizing the baffle shape, and economizing the baffle area.

Zusammenfassung

Aus dem Dublettmodell einer kreisförmigen Schallwand wird ein Modell entwickelt, welches zur Abschätzung der axialen Übertragung von einer beliebig geformten Schallwand benutzt werden kann. Die sich ergebende Gleichung zwischen Form und Übertragungseigenschaften ist lösbar und wird in eine Entwurfsgleichung für die Form umgewandelt. Die Schallwandgröße ergibt sich aus der Festlegung der unteren Grenzfrequenz. Eine Gleichung drückt den gegenseitigen Zusammenhang zwischen Herabsetzung der Grenzfrequenz, unregelmäßiger Verformung der Schallwand und Einsparung von Schallwandfläche aus.

Sommaire

On applique au calcul de la réponse axiale d'un écran acoustique de forme arbitraire un modèle à doublets qui avait été élaboré antérieurement pour des écrans circulaires. La formule résultante, liant la forme de l'écran à sa réponse, est réversible et peut se transformer en une formule donnant la forme en fonction de la réponse souhaitée, et donc bien plus adaptée au développement des projets. Quant à la dimension de l'écran, elle se détermine à partir de la fréquence de coupure la plus base. Une autre formule exprime les restrictions mutuelles entre l'abaissement de la fréquence inférieure de coupure, les irrégularités de forme de l'écran et la minimisation de la surface de ce même écran.

Document Type: Research Article

Publication date: November 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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