Mafaz, Bilqia (2025) Studi Eksperimental Tentang Karakteristik Penyerapan Bunyi Pada Panel Sandwich Yang Terbuat Dari Abaca Wool Dan Panel Resonator Plywood. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kebutuhan akan material penyerap bunyi yang ramah lingkungan dan berbahan dasar alami semakin meningkat seiring dengan tuntutan akan keberlanjutan dalam pembangunan dan industri akustik. Penelitian ini mengevaluasi performa akustik Wol Abaka, yakni serat abaka yang dimodifikasi melalui alkalisasi NaOH 15% untuk meningkatkan porositas dan fleksibilitas. Serat hasil perlakuan memiliki diameter rata-rata 14 µm dan densitas optimal 78,5 kg/m³. Uji akustik menggunakan tabung impedansi menunjukkan dua puncak koefisien absorpsi bunyi, yaitu 0,80 pada 1000 Hz dan 0,90 pada 4600 Hz, yang menandakan kemampuan penyerapannya sangat baik pada frekuensi menengah dan tinggi. Dalam konfigurasi panel sandwich dengan plywood berlubang (diameter 6 mm, jarak antar lubang 2 mm), koefisien absorpsi mencapai nilai puncak 0,80 pada 800 Hz melalui mekanisme resonansi Helmholtz. Simulasi menunjukkan kesesuaian dari hasil eksperimen, namun menghasilkan deviasi hingga RMSE 0,23 untuk struktur kompleks. Temuan ini membuktikan bahwa Wol Abaka mampu menjadi alternatif serat alami yang unggul dan berkelanjutan dalam aplikasi material penyerap suara, khususnya untuk ruang percakapan dan ruang dalam lainnya yang memerlukan pengendalian akustik presisi di rentang frekuensi vokal manusia. ==================================================================================================================================
The demand for environmentally friendly and natural-based sound-absorbing materials is increasing in line with the growing emphasis on sustainability in construction and acoustic engineering. This study investigates the acoustic performance of Wol Abaka, an alkali-treated abaca fiber modified using 15% NaOH to enhance porosity and structural flexibility. The treated fibers exhibited an average diameter of 14 µm and an optimal bulk density of 78.5 kg/m³. Impedance tube measurements revealed two distinct absorption peaks, with sound absorption coefficients of 0.80 at 1000 Hz and 0.90 at 4600 Hz, indicating high effectiveness in the mid-to-high frequency ranges. When configured as a sandwich panel with perforated plywood facing (6 mm hole diameter, 2 mm spacing), the system achieved a peak coefficient of 0.80 in the 800 Hz range due to Helmholtz resonance effects. Simulations showed general agreement in experiment result but yielded a higher root mean square error (RMSE = 0.23) in complex sandwich structures. These findings highlight Wol Abaka as a promising sustainable alternative to mineral-based acoustic materials, particularly for indoor environments requiring efficient sound absorption across voice frequency ranges. Experimental validation remains essential to accurately capture the complex interactions within bio-based porous systems.
Item Type: | Thesis (Masters) |
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Uncontrolled Keywords: | Absorpsi Bunyi, Densitas Serat, Panel Sandwich, Porositas, Wol Abaka, Abaca-wool, Acoustic Absorption, Fiber Density, Porosity, Sandwich Panel |
Subjects: | Q Science > QC Physics > QC173.4.C63 Composite materials Q Science > QC Physics > QC221 Acoustics. Sound |
Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis |
Depositing User: | Bilqia Mafaz |
Date Deposited: | 30 Jul 2025 01:06 |
Last Modified: | 30 Jul 2025 01:06 |
URI: | http://repository.its.ac.id/id/eprint/123265 |
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