| Issue |
MATEC Web Conf.
Volume 320, 2020
V All-Russian Conference of Young Scientists and Specialists “Acoustics of the Environment” (ASO-2020)
|
|
|---|---|---|
| Article Number | 00024 | |
| Number of page(s) | 12 | |
| DOI | https://doi.org/10.1051/matecconf/202032000024 | |
| Published online | 24 September 2020 | |
Sound Scattering Properties of Surfaces with Diffusers
1 Bauman Moscow State Technical University, 105005, Moscow, Russia
2 Andreyev Acoustic Institute, 117036, Moscow, Russia
* Corresponding author: marinalavro@mail.ru
This article compares the values of the normal scattering coefficient measured in a model experiment for two types of diffusers placed on a rigid surface. Wooden diffusers of cubic and pyramidal shapes were tested in a scale model of a room with dimensions of 0.7x0.4x0.4 m. Sound decay curves were measured at frequencies of 4kHz and 8kHz. Two large walls were covered with a porous absorber, on the third, in certain combinations, the investigated diffusers with a characteristic size of 3.5 cm were placed, the number of which varied from 0 to 29. The idea of the applied method is that the sound decay curve in a room with a non-diffuse sound field depends significantly from the scattering properties of surfaces. The decay curve was measured with different numbers of the diffusers on the test wall, which made it possible to determine the influence of the shape of the diffusers and their number on the value of the normal scattering coefficient. According to the results of the measurements a high scattering ability of cubic elements was revealed in comparison with pyramidal ones.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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