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An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison

Publication ,  Journal Article
Franzoni, LP; Elliott, CM
Published in: Journal of the Acoustical Society of America
October 1, 2003

Experiments were performed on an elongated rectangular acoustic enclosure with different levels of absorptive material placed on side walls and an end wall. The acoustic source was a broadband high-frequency sound from a loudspeaker flush-mounted to an end wall of the enclosure. Measurements of sound-pressure levels were averaged in cross sections of the enclosure and then compared to theoretical results. Discrepancies between the experimental results and theoretical predictions that treated all incidence angles as equally probable led to the development of an angle-by-angle approach. The new approach agrees well with the experimentally obtained values. In addition, treating the absorptive material as bulk reacting rather than point reacting was found to significantly change the theoretical value for the absorption coefficient and to improve agreement with experiment. The new theory refines an earlier theory based on power conservation and locally diffuse assumptions. Furthermore, the new theory includes both the angle of incidence effects on the resistive and reactive properties of the absorptive material, and the effects of angle filtering, i.e., that reflecting waves associated with shallow angles become relatively stronger than those associated with steep angles as a function of distance from the source. © 2003 Acoustical Society of America.

Duke Scholars

Published In

Journal of the Acoustical Society of America

DOI

ISSN

0001-4966

Publication Date

October 1, 2003

Volume

114

Issue

4 I

Start / End Page

1968 / 1979

Related Subject Headings

  • Acoustics
 

Citation

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Franzoni, L. P., & Elliott, C. M. (2003). An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison. Journal of the Acoustical Society of America, 114(4 I), 1968–1979. https://doi.org/10.1121/1.1610455
Franzoni, L. P., and C. M. Elliott. “An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison.” Journal of the Acoustical Society of America 114, no. 4 I (October 1, 2003): 1968–79. https://doi.org/10.1121/1.1610455.
Franzoni LP, Elliott CM. An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison. Journal of the Acoustical Society of America. 2003 Oct 1;114(4 I):1968–79.
Franzoni, L. P., and C. M. Elliott. “An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison.” Journal of the Acoustical Society of America, vol. 114, no. 4 I, Oct. 2003, pp. 1968–79. Scopus, doi:10.1121/1.1610455.
Franzoni LP, Elliott CM. An angle-by-angle approach to predicting broadband high-frequency sound fields in rectangular enclosures with experimental comparison. Journal of the Acoustical Society of America. 2003 Oct 1;114(4 I):1968–1979.

Published In

Journal of the Acoustical Society of America

DOI

ISSN

0001-4966

Publication Date

October 1, 2003

Volume

114

Issue

4 I

Start / End Page

1968 / 1979

Related Subject Headings

  • Acoustics