Special Issue 2, December 2018
Article Number: 11
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Analysis of Sound Absorption Coefficient (Case Study: Gypsum panel, gypsum-arenga pinnata fibre, arenga pinnata fibre-gypsum and foamed concrete- arenga pinnata fibre)

Fuady, Z., Ismail, Fauzi, and Zulfian
Pages 539-550

Abstract—This research is conducted to analyse the sound absorption coefficient of several panel materials which are measured as a single panel and combined panels. Those panels are: gypsum panel, gypsum panel - palm fibre panel, palm fibre panel - gypsum panel, and foamed concrete panel - palm fibre panel. The measurement of sound absorption coefficient was conducted by using reverberation chamber method based on the ISO 354-1985 with the type of the sound sources: white noise and pink noise at the frequency of 125 Hz - 8000 Hz. According to this research, the gypsum panel - palm fibre panel possesses the coefficient of sound absorption (α) = 0.93 at low frequency; the palm fibre panel has α = 0.97 at medium frequency; and the foamed concrete panel - palm fibre panel possesses α = 0.89 at high frequency. The measurement by using sound source of pink noise produces α = 0.99 for gypsum panel - palm fibre panel at low level; palm fibre panel - gypsum panel possesses α = 0.86 at medium level; and palm fibre panel - gypsum panel has α = 0.64 at high level. The palm fibre panel could absorb sound wave well since this material has bigger air space (pore) than the foamed concrete and gypsum panels. Consequently, when the sounds wave enters to this material it will be trapped in the pore inside the panel. Palm fibre panel influences an increasing of sound absorption coefficient value at the combination materials when the panel of palm fibre was placed under other panels. However, the absorption coefficient values of both palm fibre panel and palm fibre panel - gypsum panel are about the same.

Keywords—coefficient of sound absorption, white noise, pink noise