PENGARUH POROSITAS PADA TINGKAT REDAMAN SUARA PAPAN PARTIKEL SERBUK SEKAM PADI

Abstract

Recently, rice is still being one of the main agricultural products in agrary country, such as Indonesia, Thailand and Vietnam. As one of the rice producent in the world, the potentional of rice husk product is huge. Rice husk has became one of waste biomass from rice milling process. Globally, rice husk only use as a solid fuel or a subtitude for brick product processing, spread in animal shelter or just being a garbage. But now, rice husk has been already used for activated carbon, briket, and main source that already been used for electronical, mechanical, medical, and even art. Meanwhile, in this research, rice husk would be used as a sound absorber, and because of noise pollutant is one of uncomfortable pollutant for us, this research is more useful. By reducing more noise, it would be better for employer work and productivity of company. The main purpose from the research is “The Influence of Porosity On Sound Absorption of Rice Husk Ash Particle Board” is to describe level of sound absorption from the raw material of rice husk and describe the influence of porosity to it sound absorption coefficient, also to describe potential of rice husk in sound absorption, compared to other absorber. This research was done by two test methods of sound absorption, that was direct method and impedance tube method using standing wave. The level of sound absorption that has been produced from each product in this paper is influenced with mass density and material porous on product. In this paper, absorption coefficient at frequency 1000 Hz has better value than absorption coefficient at frequency below 1000 Hz. Sound absorber with rice husk material has good absortion coefficient value compared to other absorber material. In frequency 1000 Hertz, it achieves to 0.9 in sound absorption coefficient that approaches to a perfect value (1.0).