Comparing a Phased Combination of Acoustical Radiosity and the Image Source Method with Other Simulation Tools
Regular paper
Saint-Gobain Ecophon
Monday 1 june, 2015, 17:00 - 17:20
0.9 Athens (118)
Abstract:
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.