The results of the study of sound scattering properties of three types of sound diffusing elements with pyramidal, cubic and hemispherical shapes are presented. Comparative measurements of the scattering coefficient under the normal incidence of the sound wave, as well as the impact of their concentration (the number of elements per unit area) on the scattering efficiency were carried out. The dependences of sound scattering properties for three forms of scatterers at different concentrations (from 2 to 121 elements on the test surface) are obtained. In all cases, the elements are evenly distributed over the surface. It was found that at low concentrations (2-20 scatterers on the test wall) cubic scatterers are the most effective, and pyramidal scatterers are the least effective. As the concentration of elements increases the scattering cross-section of pyramidal elements increases and the scattering cross-section of cubic and hemispherical elements reaches a certain limit value.
$^1$Bauman Moscow State Technical University\
$^2$Andreyev Acoustic Institute
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