Karakterisasi Koefisien Absorbsi Bunyi dan Impedansi Akustik Dari Sekam Padi

Authors

  • Muhammad Defrizal Jurusan Fisika Universitas Andalas
  • Elvaswer Elvaswer Jurusan Fisika Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.10.3.351-356.2021

Abstract

Penelitian ini menentukan koefisien absorbsi bunyi dan impedansi akustik dari panel sekam padi menggunakan metode tabung impedansi.  Sampel panel akustik divariasikan densitasnya dari 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 dan 0,7 g/cm3.  Pengukuran dilakukan pada frekuensi 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz dan 8000 Hz.  Hasil penelitian memperlihatkan bahwa nilai koefisien absorbsi bunyi paling tinggi adalah 0,99 pada frekuensi 4000 Hz untuk densitas 0,4 g/cm3.  Secara teori nilai ini terlalu tinggi, hal ini disebabkan oleh anomali dimana terdapat celah dipinggiran sampel dengan tabung. Nilai tertinggi yang sesuai adalah 0,86 dengan densitas 0,5 g/cm3 pada frekuensi 2000 Hz.  Nilai impedansi akustik tertinggi 1,84 dyne.s/cm5 pada frekuensi 4000 Hz dengan densitas 0,5 g/cm3.



 

This study determined the sound absorption coefficient and acoustic impedance of the rice husk panels using the impedance tube method. The density of acoustic panel samples varied from 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 and 0,7 g/cm3. Measurements were made at a frequency of 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz and 8000 Hz. The results showed that the highest sound absorption coefficient was 0,99 at a frequency of 4000 Hz for a density of 0,4 g/cm3.  In theory this value is too high, this is due to anomaly where there is a gap between the sample and the tube. The highest suitable value is 0,86 with a density of 0,5 g/cm3 at a frequency of 2000 Hz. The highest acoustic impedance value is 1,84 dyne.s/cm5 at a frequency of 4000 Hz with a density of 0,5 g/cm3    

Penelitian ini menentukan koefisien absorbsi bunyi dan impedansi akustik dari panel sekam padi menggunakan metode tabung impedansi.  Sampel panel akustik divariasikan densitasnya dari 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 dan 0,7 g/cm3.  Pengukuran dilakukan pada frekuensi 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz dan 8000 Hz.  Hasil penelitian memperlihatkan bahwa nilai koefisien absorbsi bunyi paling tinggi adalah 0,99 pada frekuensi 4000 Hz untuk densitas 0,4 g/cm3.  Secara teori nilai ini terlalu tinggi, hal ini disebabkan oleh anomali dimana terdapat celah dipinggiran sampel dengan tabung. Nilai tertinggi yang sesuai adalah 0,86 dengan densitas 0,5 g/cm3 pada frekuensi 2000 Hz.  Nilai impedansi akustik tertinggi 1,84 dyne.s/cm5 pada frekuensi 4000 Hz dengan densitas 0,5 g/cm3.

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Published

2021-09-21

How to Cite

Defrizal, M., & Elvaswer, E. (2021). Karakterisasi Koefisien Absorbsi Bunyi dan Impedansi Akustik Dari Sekam Padi. Jurnal Fisika Unand, 10(3), 351–356. https://doi.org/10.25077/jfu.10.3.351-356.2021

Issue

Vol. 10 No. 3 (2021)

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