A phased combination of acoustical radiosity and the image source method (PARISM) 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, as they are often small rectangular rooms with most of the absorption placed on the ceiling. Here, PARISM is used for comparisons with other simulation tools and measurements. An empty, rectangular room with a suspended absorbing ceiling is used for the comparisons. It was found that including the phase information in simulations increases the spatial standard deviation, even if only the propagation phase is considered. It was furthermore found that it is difficult to match simulations with measurements, when the input data are unknown and therefore estimated.
|Title of host publication||Proceedings of Euronoise 2015|
|Number of pages||6|
|Publication status||Published - 2015|
|Event||EuroNoise 2015: 10th European Congress and Exposition on Noise Control Engineering - Maastrict, Netherlands|
Duration: 31 May 2015 → 3 Jun 2015
|Period||31/05/2015 → 03/06/2015|