Abstract
Sound absorption properties of a natural waste of a date palm fiber panel have been presented in this chapter. The measurements were carried out for a single-layer sample using an impedance tube. The experiments were conducted for the panel with and without perforated plate facing. Three air gap thicknesses of 10, 20, and 30 mm were used between the date palm fiber sample and the rigid backing of the impedance tube to study the effect of the air gap on the panel sound absorption. An improvement in the sound absorption coefficient at higher and lower frequency ranges is found when facing the palm date fiber sample with perforated plate. Further investigation was carried out to test the effect of air gap backing and perforated plate facing combination on the sound absorption coefficient of the date palm fiber sample.
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