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An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields

Publication ,  Journal Article
Franzoni, LP; Bliss, DB; Rouse, JW
Published in: Journal of the Acoustical Society of America
December 29, 2001

A boundary element method is formulated in terms of time-averaged energy and intensity variables. The approach is applicable to high modal density fields but is not restricted to the usual low-absorption, diffuse, and quasiuniform assumptions. A broadband acoustic energy/intensity source is the basic building block for the method. A directivity pattern for the source is derived to account for local spatial correlation effects and to model specular reflections approximately. A distribution of infinitesimal, uncorrelated, directional sources is used to model the boundaries of an enclosure. These sources are discretized in terms of boundary elements. A system of equations results from applying boundary conditions in terms of incident, reflected, and absorbed intensity. The unknown source power for each element is determined from this system of equations. A two-dimensional model problem is used to demonstrate and verify the method. Exact numerical solutions were also obtained for this model problem. The results show that spatially varying mean-square pressure levels are accurately predicted at very low computational cost. © 2001 Acoustical Society of America.

Duke Scholars

Published In

Journal of the Acoustical Society of America

DOI

ISSN

0001-4966

Publication Date

December 29, 2001

Volume

110

Issue

6

Start / End Page

3071 / 3080

Related Subject Headings

  • Acoustics
 

Citation

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Chicago
ICMJE
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Franzoni, L. P., Bliss, D. B., & Rouse, J. W. (2001). An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields. Journal of the Acoustical Society of America, 110(6), 3071–3080. https://doi.org/10.1121/1.1416201
Franzoni, L. P., D. B. Bliss, and J. W. Rouse. “An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields.” Journal of the Acoustical Society of America 110, no. 6 (December 29, 2001): 3071–80. https://doi.org/10.1121/1.1416201.
Franzoni LP, Bliss DB, Rouse JW. An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields. Journal of the Acoustical Society of America. 2001 Dec 29;110(6):3071–80.
Franzoni, L. P., et al. “An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields.” Journal of the Acoustical Society of America, vol. 110, no. 6, Dec. 2001, pp. 3071–80. Scopus, doi:10.1121/1.1416201.
Franzoni LP, Bliss DB, Rouse JW. An acoustic boundary element method based on energy and intensity variables for prediction of high-frequency broadband sound fields. Journal of the Acoustical Society of America. 2001 Dec 29;110(6):3071–3080.

Published In

Journal of the Acoustical Society of America

DOI

ISSN

0001-4966

Publication Date

December 29, 2001

Volume

110

Issue

6

Start / End Page

3071 / 3080

Related Subject Headings

  • Acoustics