Sound absorption properties of multilayered polymer compositematerials with nonplanar interfaces

This paper mainly studies the sound absorption properties of a new type of multilayered polymer composite materials with nonplanar interfaces at different temperatures and pressures. The new type of multilayered composites with the nonplanar interfaces and a t raditional multilayered composite with a planar interface were preparedand their sound absorption coefficient s were measured in the sound tube. The result s show that the sound absorptioncoefficient s of the new type of absorbers are higher than those of the t raditional absorber within the interested f requency range. The sound absorption coefficient peak values of the new type of absorbers shif t to the low f requencieswith temperatures increasing , but they are not sensitive to the pressures. It is suggested that appropriately designing the interface shape of multilayer polymer composite materials can enhance their sound absorption properties