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The effects of structural parameters of needle-punched nonwoven fabrics on their acoustical absorption in the low frequency range are investigated in this study. A total of 60 samples of needle punched fabrics with varying fineness (denier), thickness, weight per unit area and porosity were chosen to measure the values of flow resistance and sound absorption coefficient in the frequency range of 200 Hz to 2000 Hz. The measured data were analyzed by using multiple linear regression methods in the SAS system.
Statistical models representing the flow resistance and acoustical absorption properties of the fabrics were generated. The models obtained showed good correlations with the experimental data (r = 0.931 for the flow resistance and r = 0.847 for the acoustical absorption coefficient). The models are used to study the effects of structural parameters of needle-punched fabrics on sound absorption performance in low frequency ranges.
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Sound Absorption Properties of Needle-Punched Nonwoven Fabrics, 1992 Nonwovens Conference Proceeding