Sound-Absorption Properties of Kapok Fiber Nonwoven Fabrics at Low Frequency

摘要

In this study, the sound-absorption properties of kapok fiber nonwoven fabrics were investigated in the frequency region of 100-2500 Hz using the impedance tube method. The effects of physical parameters including fiber mixing ratio, bulk density, and thickness on sound-absorption properties of composites were studied. The comparisons of kapok fiber with polypropylene fiber and hollow polyester fiber indicated that as a natural fiber, kapok fiber had superior acoustical properties at low frequency. A new simple model had been developed to predict the sound absorption coefficient of kapok fiber nonwoven composites at low frequency.