Al Mahdani, Mokhammad Mehdi (2025) Desain Material Akustik Berbasis Geometri Untuk Meningkatkan Kinerja Akustik Pada Frekuensi Rendah. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Material akustik yang tersedia saat ini masih belum mampu untuk mengendalikan kebisingan pada frekuensi rendah. Padahal kebisingan memiliki intensitas yang lebih tinggi pada frekuensi rendah. Maka dari itu, penelitian ini bertujuan untuk meningkatkan kinerja akustik di frekuensi rendah melalui desain material akustik berbasis geometri. Desain material akustik tersebut meliputi penggunaan perforasi miring dan perubahan bentuk permukaan yakni berbentuk gelombang serta gabungan antara keduanya. Kinerja akustik dalam penelitian ini adalah keofisien absorpsi bunyi, insertion loss, dan koefisien difusi bunyi. Penelitian di awali dengan melakukan perancangan desain panel. Kemudian desain tersebut akan dikarakterisasi melaui simulasi dan pengukuran. Koefisien absorpsi bunyi didapatkan dengan perhitungan teoritis, simulasi dan pengukuran. Koefisien difusi didapatkan dengan simulasi. Insertion loss didapatkan dengan pengukuran. Hasil pengukuran, perhitungan, simulasi koeifien absorpsi menunjukkan hasil yang mirip. Kemudian hasil perhitungan dan simulasi menunjukkan bahwa puncak frekuensi dari koefisien absorpsi semakin bergeser ke frekuensi rendah dengan sudut 30°, yakni di sekitar frekuensi 420 Hz. Kemudian hasil simulasi menunjukkan panel dengan bentuk gelombang miring memiliki nilai koefisien difusi bunyi sebesar 0.4 di frekuensi 250 Hz. Gabungan antara panel perforasi miring dan panel gelombang ternyata akan menghasilkan dua puncak frekuensi di frekuensi 300 Hz dan 900 Hz. Panel gabungan memiliki nilai insertion loss tertinggi sebesar 30 dB di frekuensi 125 Hz. Penambahan variasi dibelakang panel gelombang tidak mempengaruhi koefisien difusi secara signifikan
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Current acoustic materials are still unable to control noise at low frequencies. However, noise has a higher intensity at low frequencies. Therefore, this study aims to improve acoustic performance at low frequencies through the design of geometry-based acoustic materials. The acoustic material design includes the use of angled perforations and changes in surface shape, such as wave-like patterns, as well as a combination of both. The acoustic performance parameters in this study are sound absorption coefficient, insertion loss, and sound diffusion coefficient. The research begins with the design of the panels. The design will then be characterized through simulation and measurement. The sound absorption coefficient is obtained through theoretical calculations, simulation, and measurement. The sound diffusion coefficient is obtained through simulation. Insertion loss is obtained through measurement. The results of measurements, calculations, and simulations of the sound absorption coefficient show similar results. The calculation and simulation results show that the peak frequency of the sound absorption coefficient shifts toward lower frequencies at a 30° angle, around 420 Hz. The simulation results show that the panel with a slanted waveform has a sound diffusion coefficient of 0.4 at 250 Hz. The combination of the oblique perforated panel and the wave panel produces two peak frequencies at 300 Hz and 900 Hz. The combined panel has the highest insertion loss value of 30 dB at 125 Hz. Adding variations behind the wave panel does not significantly affect the sound diffusion coefficient.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Absorber, Absorber resonansi, Akustik geometri, Diffuser, Insertion loss, Koefisien absorpsi bunyi, Koefisien difusi bunyi Absorber, Acoustic geometry, Diffuser, Insertion loss, Resonant absorber Sound absorption coefficient, Sound diffusion coefficient |
| Subjects: | Q Science Q Science > QC Physics Q Science > QC Physics > QC221 Acoustics. Sound |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis |
| Depositing User: | Mokhammad Mehdi Al Mahdani |
| Date Deposited: | 28 Jul 2025 01:25 |
| Last Modified: | 28 Jul 2025 01:25 |
| URI: | http://repository.its.ac.id/id/eprint/121528 |
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