Estimation of Sound absorption Coefficient from the Sound Power

Sound absorption measurements were carried out in the reverberant room in accordance with ISO354. The present paper gives an experimental technique to estimate the sound absorption coefficient of a material based on the sound power in the reverberation room according to ISO 3741. This is in order to be able to calculate the sound absorption coefficient of the material needed to reduce the sound pressure levels in the room. Depending on Newton's (iteration) method inferred equivalent sound absorption area and sound absorption coefficient will be obtained from the sound power equation Measurements were taken on four different materials to test the method's validity (wood, rubber, Gypsum, and polyurethane sponge). For boor sound-absorbing materials, acceptable results were obtained for the corresponding sound absorption area. Due to the mutual dependency on both the properties of the material and the parameters of the reverberant environment, there was an unstable discrepancy in the results of the sound absorption coefficient for high sound-absorbing materials. The relative standard deviation for sound absorption was 0.00 while the uncertainties for sound power was 0.7dB