The Formation Design of Noise Reducers from Plywood, Foam, Tray, dan Coconut Fiber for Static Sources

Authors

Melati Ferianita Fachrul, Jurusan Tenik Lingkungan, Universitas Trisakti, Jakarta 11440, IndonesiaFollow
Wisnu Eka Yulyanto, Lab Kebisingan dan Getaran, PUSARPEDAL KLH, Serpong, Tangerang 15310, Indonesia
Asharani Merya, Jurusan Tenik Lingkungan, Universitas Trisakti, Jakarta 11440, Indonesia

Abstract

The Formation Design of Noise Reducers from Plywood, Foam, Tray, dan Coconut Fiber for Static Sources. Research was conducted in a semi-anechoic room using a method referring to the ISO 3745. The design used is the Hemisphere in which the source of noise is analogous to engines in an industry. The value reduction in the rate of sound power is obtained by comparing the sound power level before and after control is given. The noise control test materials used consist of layers of plywood, foam, fiber and tray (egg box). The effectiveness of these materials is tested by measuring the sound transmission loss (STL). Test results reveal that the sound power level (Lw) of the source of noise produces a high Lw which is 99.6 dB. at a frequency of 8000 Hz. The measurement of Lw on the source of noise which is covered by plywood produces a total of 78.66 dB Lw with an Lw reduction of 21.02%. The measurement on the sound source covered by plywood and foam materials produces a total of 47.79 dB Lw with an Lw reduction of 52.02%. The measurement of Lw by combining plywood, foam, and tray produces a total of 33.02 dB Lw with an Lw reduction of 66.84%. The measurement of the total Lw after being covered by plywood, foam, fiber, and tray is a total of 31.94 Lw dB with an Lw reduction of 67.93%.

Bahasa Abstract

Penelitian dilakukan pada ruang semi bebas gema (semi-anechoic room) menggunakan metode yang mengacu kepada ISO 3745. Desain yang digunakan adalah hemisfer dengan sumber kebisingan yang dianalogikan dengan mesin dalam suatu industri. Nilai penurunan tingkat daya bunyi diperoleh dengan membandingkan tingkat daya bunyi sebelum dan sesudah dikendalikan. Material uji pengendali kebisingan yang digunakan terdiri dari lapisan plywood, busa, sabut dan tray (boks telur). Pengujian keefektifan bahan-bahan tersebut dilakukan dengan pengukuran sound transmission loss (STL). Hasil pengujian menunjukkan bahwa tingkat daya bunyi (Lw) pada sumber suara menghasilkan Lw yang besar pada frekuensi 8000 Hz yaitu 99,6 dB. Pengukuran Lw sumber bunyi yang ditutup kotak plywood menghasilkan Lw total sebesar 78,66 dB dengan pengurangan Lw sebesar 21,02%. Pengukuran sumber bunyi dengan penggabungan bahan plywood dan busa menghasilkan Lw total sebesar 47,79 dB dengan pengurangan Lw sebesar 52,02%. Pengukuran Lw dengan penggabungan plywood, busa dan tray menghasilkan Lw total sebesar 33,02 dB terjadi pengurangan Lw sebesar 66,84%. Pengukuran Lw total setelah ditutupi dengan penggabungan bahan plywood, busa, tray dan sabut menghasilkan Lw total sebesar 31,94 dB dengan pengurangan Lw sebesar 67,93%.

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Recommended Citation

Fachrul, Melati Ferianita; Yulyanto, Wisnu Eka; and Merya, Asharani (2011) "The Formation Design of Noise Reducers from Plywood, Foam, Tray, dan Coconut Fiber for Static Sources," Makara Journal of Technology: Vol. 15: Iss. 1, Article 10.
DOI: 10.7454/mst.v15i1.858
Available at: https://scholarhub.ui.ac.id/mjt/vol15/iss1/10