T. Firsa, Muhammad Tadjuddin, M. Iqbal, R. Syah Putra
Abaca and coconut coir fibers which are natural fibers able to be as damping material effectively. Those fibers availability in Aceh are abundant and the price are relatively cheaper compared to other types of dampers material. This research aims to determine the level of sound absorption of abaca and coconut coir fibers. Tests are carried out in the Reverberation Room, which refers to ISO—354: 2003 regarding standard measurements with reverberation space methods. The temperature and humidity in the room without air conditioning respectively is 32.0 0 C and 89.6%. The calibration of the microphone is 113.7 dB at a frequency of 1 kHz with sensitivity—27.3 dB. The measurements were made using Real Time Analyzer 140 with a filter band 1/3 octave, frequency range 125–6.3 kHz. Type of sound used in the research was White Noise and Pink Noise. Based on the test results show that the Abaca fiber test sample with a test sample area of 1.21 m2 has a maximum absorption coefficient at low frequency (160–250 Hz) which is 0.93 (93%) at a frequency of 200 Hz and minimum at low frequencies (125–500 Hz) which is 0.17 (17%) at 315 Hz. The coefficient values tend to be stable at intermediate frequencies (1000–3150 Hz) ranging between 0.26 and 0.47 (26–47%). While the coconut fiber test sample has a maximum absorption coefficient at high frequencies (1600–6300 Hz) at 0.84 (84%) at 2000 Hz and a minimum at low frequencies (125–500 Hz) at 0.12 (12%) at 250 Hz. The absorption coefficient value of coconut coir tends to be stable at medium frequencies (800–1250 Hz) ranging between 0.14 and 0.33. So the sound energy that occurs in coconut coir is 14–33% of the total energy that comes. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Department of Mechanical Engineering, Universitas Syiah Kuala, Jl. Tgk. Syech Abdurrauf No. 7 Darussalam, Banda Aceh, 23111, Indonesia
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