Authors:
R. Kalaivani,L.S. Ewe,Abdoulhdi A. Borhana,DOI NO:
https://doi.org/10.26782/jmcms.spl.9/2020.05.00015Keywords:
Oil Palm Trunk,Natural Fibre,Thickness,Density,Sound Absorption Coefficient,SAC (α),Abstract
In recent years, oil palm is one of the natural fibre being researched and tested to be used as an acoustic absorber. Experiments have been conducted on different parts of oil palm tree such as Empty Fruit Brunch (EFB), Oil Palm Frond (OPF), Oil Palm Trunk (OPT) and so on. This paper specifically discusses the analysis of the OPT fibre as a function of the sound absorber in densities of 120 kg/m3, 140 kg/m3, 160 kg/m3 and 180 kg/m3 with thicknesses of 10 mm, 14 mm and 18 mm. The OPT natural fibres were fabricated using method of Low-Density Fibreboard (LDF). The results show prominent Sound Absorption Coefficient, SAC (α) values for sample with thickness of 10 mm and 14 mm at frequency range of 3500 Hz to 6400 Hz for all densities except for sample with density of 180 kg/m3. As the thickness and density increases, the resonance peak shifted to lower frequency due to lower perforation exist within the sample which decreases the value of the absorption value. In comparison between the density and thickness, optimum and best result were produced by the sample with thickness and density of 14 mm and 120 kg/m3, respectively, where the SAC (α) value is around 0.93 at wide frequency of 3500 Hz to 5500 Hz. Nevertheless, sample density of 180 kg/m3 also exhibits similar behavior but with lower SAC (α) value and the maximum absorption value of 0.50 over the frequency range of 2500 Hz to 6400 Hz for all the thickness.Refference:
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