Open AccessKARAKTERSTIK SERAPAN SUARA KOMPOSIT POLYESTER BERPENGUAT SERAT TAPIS KELAPA
Author(s) -
I Made Jiwa Astika,
I Gusti Komang Dwijana
Publication year - 2016
Publication title -
dinamika teknik mesin
Language(s) - English
Resource type - Journals
eISSN - 2502-1729
pISSN - 2088-088X
DOI - 10.29303/d.v6i1.19
Subject(s) - materials science , composite material , polyester , fiber , absorption (acoustics) , volume fraction , volume (thermodynamics) , attenuation coefficient , noise reduction coefficient , optics , porosity , physics , quantum mechanics
The purpose of this study is to investigate of sound absorption of coconut filter fiber composites. The research material made with coconut filter fiber as reinforcement and matrix resin unsaturated polyester (UPRs) type Yukalac BQTN 157 with 1% hardener types MEKPO (Methyl Ethyl Ketone Peroxide) and fiber treatment by 0,5% KMnO4. Production methods is poltrusion and the variations of fiber volume fraction are 20, 25 and 30% and fiber length are 5, 10 and 15 mm. Testing of sound absorption frequency are 250, 500, 1000, 2000 and 4000 Hz. The results of research show that the highest value of sound absorption coefficient is on the composites with composition of 10 mm fiber length and 30% fiber volume fraction, that is 0.550828. The values are included in the class “Sound Absorption Coefficient Class D (Extremely absorbing)” with the range 0.40 – 0.60 based on ISO standard 11654:1997.