Experimental determination of Sound Absorption Coefficients of Four types of Malaysian Wood
Currently, one of the important topics in acoustic science is noise control. It is important to control the noise in order to minimize extraneous noise in rooms, buildings, and our environment. Noise control can be achieved by reducing the intensity of sound to the level that is not harmful to hu...
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| Main Authors: | , , |
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| Format: | E-Article |
| Language: | English |
| Published: |
Trans Tech Publications, Switzerland
2013
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/9186/1/Experimental%20Determination%20of%20Sound%20Absorption%20Coefficients%20of%20Four%20Types%20of%20Malaysian%20Wood%20%28absract%29.pdf http://ir.unimas.my/id/eprint/9186/ |
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| Summary: | Currently, one of the important topics in acoustic science is noise control. It is important
to control the noise in order to minimize extraneous noise in rooms, buildings, and our
environment. Noise control can be achieved by reducing the intensity of sound to the level that is
not harmful to human ear. There are four basic principles employed to reduce noise which is
absorption, isolation, vibration isolation, and vibration damping. In fact, the most recognized
technique to reduce noise is sound absorption on the materials itself. Sound absorption on material
such as wood and porous material have been developed and studied by few researchers. Materials
that reduce the sound intensity as the sound wave passes through it by the phenomenon of
absorption are called sound absorptive materials. There are lot of methods can be used on
determining the sound absorption coefficient of materials. In this paper, a preliminary work has
been carried out experimentally to determine the sound absorption coefficient of four types of
Malaysian wood. They are Tapang (Koompassia excels), Pulai (Alstonai angustiloba), Selunsor
merah (Tristianiopsis beccariana) and Jelutong (Dyera polyphylla). The test was performed using
the ASTM E1050-98/ISO 10534-2 (American Society for Testing and Material) standards for the
sound absorption coefficient testing. This method is known as impedance tube method (Two-
Microphone Method). The absorption coefficient depends on the frequencies. In this study the
values of the frequencies used was in the range from 350 Hz to 1000 Hz. |
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