Sound absorption mechanism and sound absorption characteristics
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Some insulation materials, such as polystyrene and some polyvinyl chloride foams, also have a large number of air bubbles inside, but most of them are single closed and not connected to each other, so the sound absorption effect is not good. Roughing the surface of the wall, such as cementing, does not improve its permeability, so it does not increase its sound absorption coefficient.
The sound absorption frequency characteristics of the multi-space sound absorbing material are: the middle and high frequency sound absorption coefficient is large, and the low frequency sacrifice coefficient is small.