- Franzoni, L.P., Analytical and computational predictions of broadband high-frequency sound fields for room acoustics using energy conservation,
8th International Congress on Acoustics
pp. 4 pp. - .
(last updated on 2007/04/06)
Broadband reverberant sound fields in rooms often exhibit spatial variation in mean-square pressure. Several analysis methods for steady-state broadband fields in long rectangular rooms having a source on an end wall are explained and compared. These analytical models embody different degrees of physical refinement. At the most basic level is an energy balance model that utilizes diffuse field assumptions locally at each cross-section along the enclosure. This model works quite well for low absorptivity. The next level of refinement is a cross-sectional energy balance model that considers waves propagating down the room on an angle-by-angle basis, however diffuse field assumptions are retained for cross-sectional components of the field. This angle-by-angle refinement generally gives better results, particularly for highly absorptive cases where there are large spatial gradients in the reverberant field. This model clearly illustrates the important effects of angular dependence on the sound field. Computed results from the analysis methods are compared with exact numerical simulations and experimental data. The effects of angular dependence and diffuse versus specular reflection are clearly illustrated
acoustic field;acoustic intensity measurement;acoustic wave propagation;architectural acoustics;energy conservation;numerical analysis;reverberation;