Abstract
A new sample made of local textile material (100% cotton) (Misr Spinning and Weaving Company, Mehalla El Kubra) is produced from a specially woven structure which possesses high porosity for use as a sound absorbing curtain. A double-layered curtain was designed for high efficiency, not only in sound absorption, but also light insulation. One layer was made of 100% cotton, while the other was made of cotton/polyester 35:65. The two layers are separated by an air space, which is varied to obtain a construction of optimum effectiveness. Using the standing wave apparatus (Bruel and Kjaer type 4002), the sound absorption coefficient α of such samples was measured at normal sound incidence. The effect of air space, behind and/or between the layers of curtain, on the absorption coefficient has been studied in order to achieve the best construction for a specific application.
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