Efficiency of acoustic absorption board from pomelo peels

Abstract

This study focused on the evaluated efficiency of the acoustic absorption board from pomelo peels and comparison sound absorption efficiency with different thicknesses and densities of the acoustic absorption board. The thickness of the sound absorber was varied in 3 sizes in 3 sizes i.e., 0.5 cm, 1 cm, and 2 cm, and 2 densities i.e., 784 kg/m³ and 1569 kg/m³ at constant thickness of 0.5 cm. The impedance tube testing according to ASTM C384-04 was used to measure the sound absorption coefficient. The results showed, at the difference thickness the 2 cm thickness with constant density of 784 kg/m³ pomelo peel fibers sound absorber provided the maximum absorption performance which achieved NRC at 0.67 ± 0.06 while the 0.5 cm and 1 cm provided 0.66±0.06 and 0.57±0.03 respectively. With the difference density, the 784 kg/m³ and 1569 kg/m³ of pomelo peel fibers sound absorber provided no statistically significant difference with a significance level of 0.05 which achieved NRC at 0.66±0.06 and 0.71±0.01 respectively.