Comparing a Phased Combination of Acoustical Radiosity and the Image Source Method with Other Simulation Tools

Regular paper

Gerd Marbjerg

Saint-Gobain Ecophon

Monday 1 june, 2015, 17:00 - 17:20

0.9 Athens (118)

The model PARISM (Phased Acoustic Radiosity and Image Source Method), which combines the image source method and acoustical radiosity, has been developed. In the image source method complex boundary conditions are employed, thus including phase shifts on reflections. It has been developed in order to be able to model both specular and diffuse reflections with angle dependent and complex-valued acoustical descriptions of the surfaces. It is of great interest to model both specular and diffuse reflections when simulating the acoustics of small rooms with non-diffuse sound fields, since scattering from walls add to the diffuseness in the room. This room type is often seen in class rooms and offices, which are often small rectangular rooms with most of the absorption placed on the ceiling. Here, the PARISM model is used for comparison with other simulation tools. In the comparisons, surfaces with different scattering properties are investigated along with the influence of disregarding angle dependence and phase shifts on reflections. The room configuration of highest interest in the comparisons is a rectangular room with a highly absorbing ceiling.

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