- Franzoni, L.P. and Bliss, D.B. and Rouse, J.W., 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
pp. 3071 - 3080 [1.1416201] .
(last updated on 2007/04/06)
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.
Acoustic fields;Reflection;Absorption;Numerical analysis;