Pengaruh Ketebalan Komposit Serat Sabut Kelapa terhadap Koefisien Absorbsi Bunyi dan Impedansi Akustik Menggunakan Metode Tabung Impedansi

Authors

  • Ya Putri Jurusan Fisika FMIPA Universitas Andalas
  • Elvaswer Elvaswer Jurusan Fisika FMIPA Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.6.3.277-282.2017

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh ketebalan komposit serat sabut kelapa terhadap koefisien absorbsi bunyi dan impedansi akustik menggunakan metode tabung impedansi. Sampel dibuat dengan variasi ketebalan 0,25 cm, 0,5 cm, 0,75 cm, 1 cm dan 1,25 cm dengan rentang frekuensi yang digunakan adalah 500, 1000, 1500, 2000, dan 2500 Hz. Nilai koefisien absorbsi bunyi terendah sebesar 0,44 terdapat pada ketebalan 0,25 cm dengan frekuensi 1500 Hz. Nilai koefisien absorbsi bunyi tertinggi sebesar 0,92 terdapat pada sampel dengan ketebalan 1,25 cm dengan frekuensi 2500 Hz. Hal ini disebabkan karena gelombang bunyi pada frekuensi yang lebih tinggi lebih banyak bervibrasi melalui pori-pori yang ada pada sampel daripada dipantulkan. Nilai impedansi akustik terendah sebesar 0,569 dyne.sekon/cm berada pada frekuensi 500 Hz dengan ketebalan 0.25 cm. Nilai dari impedansi akustik tertinggi 2,485 dyne.sekon/cm berada pada frekuensi 2500 Hz dengan ketebalan sampel 1,25 cm. Hal ini disebabkan oleh impedansi akustik berbanding lurus dengan induktansi dimana pada material akustik analog dengan massa.

 

Kata kunci: komposit serat sabut kelapa, koefisien absorbsi bunyi, impedansi akustik, metode tabung

impedansi

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Published

2017-07-05

How to Cite

Putri, Y., & Elvaswer, E. (2017). Pengaruh Ketebalan Komposit Serat Sabut Kelapa terhadap Koefisien Absorbsi Bunyi dan Impedansi Akustik Menggunakan Metode Tabung Impedansi. Jurnal Fisika Unand, 6(3), 277–282. https://doi.org/10.25077/jfu.6.3.277-282.2017

Issue

Vol. 6 No. 3 (2017)

Section

Articles

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Copyright (c) 2017 Ya Putri, Elvaswer Elvaswer

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