Modeling on sound transmission loss of jute needle-punched nonwoven fabrics using central composite rotatable experimental design

Abstract

Statistical models, using central composite rotatable experimental design, have been developed to predict sound transmission loss of jute needle-punched nonwoven fabric based on the three important parameters, namely needling density, depth of needle penetration and mass per unit area. From this model and its contour diagrams, the simultaneous effects of these parameters can be understood and prediction of sound transmission loss can be made knowing the values of independent parameters. The correlation coefficient between observed and predicted values is 0.94. The maximum sound loss is achieved for 14-15 mm depth of needle penetration, whereas the minimum sound loss is observed for area density 650 g/m² and punch density 180 punches/cm².