Archives of Acoustics, 43, 4, pp. 707–715, 2018
10.24425/aoa.2018.125164

On Woven Fabric Sound Absorption Prediction

Iwan PRASETIYO
Institut Teknologi Bandung
Indonesia

Gradi DESENDRA
Institut Teknologi Bandung
Indonesia

Melissa N. HERMANTO
Institut Teknologi Bandung
Indonesia

Damar R. ADHIKA
Institut Teknologi Bandung
Indonesia

For building applications, woven fabrics have been widely used as finishing elements of room interior but not in particular aimed for sound absorbers. Considering the micro perforation of the woven fabrics, they should have potential to be used as micro-perforated panel (MPP) absorbers; some measurement results indicated such absorption ability. Hence, it is of importance to have a sound absorption model of the woven fabrics to enable us predicting their sound absorption characteristic that is beneficial in engineering design phase. Treating the woven fabric as a rigid frame, a fluid equivalent model is employed based on the formulation of Johnson-Champoux-Allard (JCA). The model obtained is then validated by measurement results where three kinds of commercially available woven fabrics are evaluated by considering their perforation properties. It is found that the model can reasonably predict their sound absorption coefficients. However, the presence of perturbations in pores give rise to inaccuracy of resistive component of the predicted surface impedance. The use of measured static flow resistive and corrected viscous length in the calculations are useful to cope with such a situation. Otherwise, the use of an optimized simple model as a function of flow resistivity is also applicable for this case.
Keywords: woven fabric; prediction model; sound absorber; building applications
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

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DOI: 10.24425/aoa.2018.125164