Abstract
A sound absorber usually consists of a perforated facing backed with a porous material, and is commonly used as a sound barrier, muffler in a vehicle or any other practical acoustic application. In this paper we discuss the calculation of sound transmission loss of a perforated screen at frequencies below 4000 Hz by using a two-dimensional plane wave theory and laboratory measurements from 125 to 4000 Hz, and compare the results of theory and experiment. The paper clearly shows that the calculation of acoustic transmission loss through a perforated screen agrees well with measurements at frequencies above 315 Hz. The dependence of the transmission loss on the thickness and the percentage of perforation of perforated screen is also discussed.
Published Version
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