The Frequency Weighted Sound Pressure of a Moving Point Source in a Nondissipative Medium

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Abstract:

The frequency weighted mean square sound pressure, generated by a moving point source in a non-dissipative medium has been analyzed using the principles of geometrical acoustics. The importance of the Doppler effect is shown. Conclusions are drawn in terms of frequency, of weighted and unweighted, sound pressure level. The time pattern of the weighted mean squared pressure has been found to be reshaped with respect to the time history of the unweighted mean squared pressure.

Zusammenfassung

Der frequenzbewertete quadratisch gemittelte Schalldruck, der von einer bewegten Punktschallquelle in einem nichtdissipativen Medium erzeugt wird, wird mit Hilfe der Methoden der geometrischen Akustik untersucht. Die Wichtigkeit des Dopplereffekts wird demonstriert. Schlußfolgerungen hinsichtlich des frequenzbewerteten und des unbewerteten Schalldruckpegels werden gezogen. Es ergibt sich, daß der Zeitverlauf des bewerteten quadratisch gemittelten Schalldrucks entsprechend dem Zeitverlauf des unbewerteten quadratisch gemittelten Schalldrucks umgestaltet wird.

Sommaire

On considère une source sonore ponctuelle en mouvement dans un milieu non dissipatif et on analyse selon les principes de l'acoustique géométrique la valeur moyenne, pondérée en fréquence, du carré de la pression acoustique rayonnée par cette source. On met en évidence l'importance de l'effet Doppler. On développe diverses conclusions concernant les niveaux, pondérés en fréquence ou non, de la pression sonore. On observe par exemple que l'évolution temporelle de la valeur quadratique moyenne pondérée de la pression est conditionnée par toute l'histoire temporelle de la moyenne quadratique non pondérée.

Document Type: Research Article

Publication date: July 1, 1986

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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