Maligi, Andi (2021) Analisis Penyerapan Bunyi Pada Material Komposit Serat Pelepah Pisang Abaca Dan Pengaruhnya Terhadap Proses Alkalisasi Dan Tekanan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Absorber merupakan suatu bahan yang dapat menyerap energi bunyi, sehingga dalam aplikasinya dapat digunakan untuk masalah cacat akustik dan kebisingan. Absorber yang diteliti terbuat dari serat pisang abaca, dengan menguji kemampuannya dalam menyerap energi bunyi dan menguji kemampuan mekaniknya. Pengujian yang dilakukan adalah pengujian kadar air, kekuatan tarik serat tunggal, FTIR, densitas, morfologi, dan koefisien absorbsi. Hasil pengujian FTIR, didapatkan bahwa proses alkalisasi mempu menurunkan kadar lignin, selulosa, dan hemiselulosa pada serat pisang abaca. Hasil uji tarik serat tunggal, didapatkan nilai tensile strength meningkat sebesar 88,46% setelah dilakukan alkalisasi NaOH dan hidrolisis CH3COOH. Hasil uji koefisien absorbsi, didapatkan pengaruh alkalisasi menurunkan nilai koefisien absorbsi, yaitu pada sampel sebelum dan setelah alkalisasi pada tekanan 3,75 kPa dengan nilai α sebesar 0,77 dan 0,75. Didapatkan pengaruh tekanan yang semakin besar dapat menurunkan nilai koefisien absorbsi, yaitu pada sampel sebelum alkalisasi dengan tekanan 2,5 kPa dan 3,75 kPa mengalami penurunan nilai koefisien absorbsi dengan nilai α sebesar 0,88 dan 0,77, pada sampel setelah alkalisasi dengan tekanan 2,5 kPa dan 6,25 kPa mengalami penurunan nilai koefisien absorbsi dengan nilai α sebesar 0,90 dan 0,64. Pengaruh tekanan pada nilai koefisien absorbsi terdapat pada frekuensi 250 Hz, untuk frekuensi yang lainnya tidak terlihat perbedaan yang signifikan. Perlu dilakukan penelitian selanjutnya dengan variasi tekanan yang lebih besar untuk mengetahui perbedaan nilai koefisien absorbsi yang signifikan pada frekuensi yang lain. Sehingga serat pelepah pisang abaca dapat digunakan sebagai absorber yang mampu meningkatkan ekonomi serta ramah lingkungan.
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Absorber is a material that can absorb sound energy, so in its application it can be used for acoustic and noise defects. The studied absorber is made from abaca banana fiber, by testing its ability to absorb sound energy and testing its mechanical ability. The tests carried out were water content, single fiber tensile strength, FTIR, density, morphology, and absorption coefficient. The results of the FTIR test, it was found that the alkalization process was able to reduce the levels of lignin, cellulose, and hemicellulose in abaca banana fiber. The results of the single fiber tensile test showed that the tensile strength value increased by 88,46% after NaOH alkalization and CH3COOH hydrolysis were carried out. The results of the absorption coefficient test showed that the effect of alkalization decreased the absorption coefficient value, namely in the samples before and after alkalization at a pressure of 3,75 kPa with values of 0,77 and 0,75. It was found that the effect of greater pressure can decrease the value of the absorption coefficient, namely in the sample before alkalization with a pressure of 2,5 kPa and 3,75 kPa, the absorption coefficient decreased with values of 0,88 and 0,77, in the sample after alkalization with pressures of 2,5 kPa and 6,25 kPa experienced a decrease in the value of the absorption coefficient with values of 0,90 and 0,64, respectively. The effect of pressure on the absorption coefficient value is found at a frequency of 250 Hz, for other frequencies there is no significant difference. Further research needs to be done with a larger pressure variation to find out the significant difference in absorption coefficient values at other frequencies. So that abaca banana fiber can be used as an absorber that can increase the economy and is environmentally friendly.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | alkalisasi, koefisien absorbsi, tekanan, absorption coefficient, alkali treatment, pressure. |
| Subjects: | Q Science Q Science > QC Physics Q Science > QC Physics > QC162 Adsorption and absorption 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 > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Andi Maligi |
| Date Deposited: | 19 Aug 2021 21:55 |
| Last Modified: | 03 Dec 2024 08:58 |
| URI: | http://repository.its.ac.id/id/eprint/88879 |
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