Abstract:

In order to study the sound absorption properties of discarded wool fiber, a novel wool nonwoven material was prepared by a traditional non-woven technique with discarded wool fibers as the main raw material. Using the transfer-function method and standing wave tube method, the sound absorption properties of wool nonwoven materials in a frequency range of 250–6300 Hz were studied by changing the thickness, density, and cavity depth. Results indicated that wool nonwoven materials exhibit excellent sound absorption properties, which at high frequencies are better than that at low frequencies; at the sound waves of low frequencies, as thickness, density and cavity depth increase, sound absorption properties improve. The thickness and cavity depth are the main factors affecting the sound absorption properties of the material, moreover, it is an economic and reasonable way to increase the sound absorption properties of the material by enhancing the cavity depth.