Sound absorption behavior of woven fabrics as micro perforated panel absorber

Abstract

Woven Fabrics are potentially developed as a sound absorber system because of the presence of micro perforation on their surface. By introducing air cavity backing the woven fabrics up, such system can undergo Helmholtz resonator mechanism as found in micro-perforated panel (MPP) absorber system. The micro perforations in a woven fabric are formed by yarn in x (weft) and y (warp) direction. The perforations can create a viscos-inertial effect when interact with sound fields that is useful as a basis for sound absorption mechanism. In this study, the works are focused on investigating the relationship of micro hole of woven fabric material to sound absorption characteristics. For this, micro holes are developed by controlling weft density. Meanwhile, the sound absorption coefficients are evaluated by measurement using impedance tube. From this study, it can be concluded that the sound absorption coefficients of woven fabric are affected by weft density variation by which the perforation parameter can be varied. Moreover, the performance of woven fabrics are promising as indicated by absorption coefficients that is ranging from 0.71-1.00 with absorption bandwidth of 3 kHz-5 kHz.