Sound Absorption Characteristics of Porous Fibrous Materials with Different Density Distributions

To improve the acoustic performance of porous fibrous materials, the material thickness should be increased or nonwoven fabrics with a double layered-system should be used as described in the previous paper. In this study, the sound absorption characteristics of nonwoven fabrics with double-layered and triple-layered systems and different density distributions were investigated using an impedance-tube method. In the case of a double-layered system, the results show that a higher face material density increased the sound absorption coefficient in the middle-frequency region. In case of a triple-layered system, when combined with three kinds of materials, under the same condition of face material, a greater density difference with nonwoven in the back resulted in an increased sound absorption coefficient in the middle-frequency region.

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Sound Absorption Characteristics of Porous Fibrous Materials with Different Density Distributions

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