[ABSTRAK
Telah dilakukan penelitian tentang pengaruh diameter perforasi terhadap koefisienabsorpsi bunyi pada material gipsum secara eksperimen dengan menggunakanmetode pengukuran yang tercantum dalam ISO 354-1985. Sampel divariasikanterhadap kondisi tanpa perforasi dan terhadap diameter perforasi yaitu 0,8 mm, 1,2mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm dan 12 mm. Ada dua konfigurasi sampelyang diteliti, yaitu sampel lapis tunggal (Sampel T) dan sampel sandwich (SampelS). Hasil penelitian menunjukkan adanya peningkatan koefisien absorpsi bunyihingga 27,97% seiring dengan penambahan diameter perforasi terutama difrekuensi 125 Hz, 250 Hz, dan 500 Hz. Kenaikan koefisien absorpsi bunyi jugaterjadi pada saat diberikan sisipan rockwool di antara dua panel gipsum. Keduakonfigurasi sampel dengan diameter perforasi 12 mm bisa digunakan sebagaipilihan bahan penyerap bunyi untuk pengendalian bunyi di frekuensi 125 Hz, 250Hz, dan 500 Hz.

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ABSTRACT

Investigation on the influence of the perforation diameter to the sound absorption

coefficient in the gypsum material has been conducted experimentally by using

measurement methods in ISO 354-1985. The samples were varied on the condition

perforation. Perforation diameter about none, 0.8 mm, 1.2 mm, 2 mm, 4 mm, 6 mm,

8 mm, 10 mm and 12 mm. There were two configurations of samples, namely a

single-layer samples (Sample T) and sandwich samples (Sample S). The results

show the increasing in sound absorption coefficients up to 27,97% along with the

addition of diameter perforations, especially in the frequency of 125 Hz, 250 Hz,

and 500 Hz. The increasing in sound absorption coefficient also occur during

insertion of rockwool between two gypsum panels. Both sample configuration with

12 mm diameter perforation can be used as a sound absorbent material to control

sound at frequencies of 125 Hz, 250 Hz, and 500 Hz., Investigation on the influence of the perforation diameter to the sound absorption

coefficient in the gypsum material has been conducted experimentally by using

measurement methods in ISO 354-1985. The samples were varied on the condition

perforation. Perforation diameter about none, 0.8 mm, 1.2 mm, 2 mm, 4 mm, 6 mm,

8 mm, 10 mm and 12 mm. There were two configurations of samples, namely a

single-layer samples (Sample T) and sandwich samples (Sample S). The results

show the increasing in sound absorption coefficients up to 27,97% along with the

addition of diameter perforations, especially in the frequency of 125 Hz, 250 Hz,

and 500 Hz. The increasing in sound absorption coefficient also occur during

insertion of rockwool between two gypsum panels. Both sample configuration with

12 mm diameter perforation can be used as a sound absorbent material to control

sound at frequencies of 125 Hz, 250 Hz, and 500 Hz.]