An analysis is given of the absorption characteristics of a three-dimensional spherical absorbei, and it is shown that the latter should have a maximum absorption. Nomograms are given from which it is possible to calculate the sound absorption coefficient with given absorber pa rameters (radius of the sphere or the edge of the cube and the im pedance of its surface)or, on the other haod, to find the parameters needed to obtain a desired absorption characteristic in the field of a plane wave and in the sound diffusion field.
Department of Acoustics
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