Karakterstik Serapan Suara Komposit Polyester Berpenguat Serat Tapis Kelapa

Abstract

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.

Potensi Sekam Padi dan Jerami sebagai Alternatif Material Akustik

“…Peralatan tersebut berupa sarana informasi, komunikasi, produksi, transportasi maupun hiburan (Ashari, Heidari, & Parvaresh, 2014). Akan tetapi, peralatan tersebut menghasilkan suara-suara yang tidak diinginkan sehingga menimbulkan kebisingan (Astika & Dwijana, 2016). Salah satu cara untuk mencegah perambatan/radiasi kebisingan pada komponen/struktur mesin, ruangan/bangunan serta dalam konteks K3 kebisingan industri ialah dengan penggunaan material akustik, yaitu material yang bersifat menyerap atau meredam suara sehingga bising yang terjadi dapat direduksi (Muhammad Munir, 2015).…”

The Natural Composite of Sawdust Teak as a Sound Absorption Materials Using The Resonator Space Method

“…The use of equipment used by humans for means of communication, transportation, information, production, and entertainment cannot be separated from the noise produced (Rohim et al, 2020). Equipment that uses increasingly sophisticated technology produces unexpected sounds that cause noise and discomfort to human hearing (Astika & Dwijana, 2016). Noise problems in the community can cause discomfort in daily activities, reduce work productivity, and health problems, especially in the hearing system.…”

“…Noise is sound that comes from various kinds of human activities and equipment (Astika & Dwijana, 2016). Noise is an unwanted sound.…”