Sound absorption coefficiet of perforated plywood: an experimental case study

For sound control in closed spaces, perforated wood-based panels are widely used as walls and ceilings covering for their sound absorption properties in the low frequency range. Despite the high interest in this products, accurate estimation models of their properties are still unavailable. This paper reports the sound absorption properties determined for drilled okoumé plywood intended for interiors covering. The drilling percentage was fixed at 1.5, while different cavity sizes were arranged behind the specimens to evaluate their influence on the sound absorption. Tests were performed by means of the impedance tube method. The experimental data obtained can be used for the development of new estimation models with increased accuracy.