Experimental results on sound absorption coefficients of Malaysian woods
Sound absorption coefficient is an important parameter to calculate the reverberation time of an enclosure. There are published data inside text books on the sound absorption coefficients of typical materials, such as concrete, carpet, drapes, etc. However, the sound absorption coefficients of Mal...
| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2011
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| Online Access: | http://eprints.utem.edu.my/id/eprint/4150/ http://eprints.utem.edu.my/id/eprint/4150/1/paper_janatulv2.pdf |
| _version_ | 1848886997437906944 |
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| author | Mohammad, Janatul Islah Johari, Norhasnira Said, Md. Radzai Mohd. Nor, Mohd. Jailani |
| author_facet | Mohammad, Janatul Islah Johari, Norhasnira Said, Md. Radzai Mohd. Nor, Mohd. Jailani |
| author_sort | Mohammad, Janatul Islah |
| building | UTeM Institutional Repository |
| collection | Online Access |
| description | Sound absorption coefficient is an important parameter to calculate the reverberation time of an enclosure.
There are published data inside text books on the sound absorption coefficients of typical materials, such as
concrete, carpet, drapes, etc. However, the sound absorption coefficients of Malaysian wood have not been
published to date. These woods are divided into four different categories, which are heavy hardwoods,
medium hardwoods, light hardwoods and softwoods. This paper presents preliminary results of the sound
absorption coefficients of two types of Malaysian woods: Balau (Shorea spp) and Nyatoh (Species of
Sapotaceae); based on the transfer function method using the impedance tube. A bigger tube (100 mm) is
used for measuring the sound absorption coefficients at lower frequencies (below 800 Hz) and a smaller
tube (28 mm) is used for measuring the sound absorption coefficients at higher frequencies (above 800 Hz).
It is found that the sample with the highest sound absorption coefficient is 18 mm Balau (higher density)
while the lowest is the 34 mm Nyatoh (lower density) without the presence of air gaps. With variation of air
gaps present, Nyatoh shows the more substantial results in comparison with Balau whereby the absorption
coefficient are significantly higher than the ones without air gaps. However, the overall absorption
coefficient remains low (below 0.2) at all frequencies, regardless having different thickness, density and
variation of air gaps of up to 3”
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| first_indexed | 2025-11-15T19:47:23Z |
| format | Conference or Workshop Item |
| id | utem-4150 |
| institution | Universiti Teknikal Malaysia Melaka |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T19:47:23Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | utem-41502015-05-28T02:40:06Z http://eprints.utem.edu.my/id/eprint/4150/ Experimental results on sound absorption coefficients of Malaysian woods Mohammad, Janatul Islah Johari, Norhasnira Said, Md. Radzai Mohd. Nor, Mohd. Jailani TJ Mechanical engineering and machinery Sound absorption coefficient is an important parameter to calculate the reverberation time of an enclosure. There are published data inside text books on the sound absorption coefficients of typical materials, such as concrete, carpet, drapes, etc. However, the sound absorption coefficients of Malaysian wood have not been published to date. These woods are divided into four different categories, which are heavy hardwoods, medium hardwoods, light hardwoods and softwoods. This paper presents preliminary results of the sound absorption coefficients of two types of Malaysian woods: Balau (Shorea spp) and Nyatoh (Species of Sapotaceae); based on the transfer function method using the impedance tube. A bigger tube (100 mm) is used for measuring the sound absorption coefficients at lower frequencies (below 800 Hz) and a smaller tube (28 mm) is used for measuring the sound absorption coefficients at higher frequencies (above 800 Hz). It is found that the sample with the highest sound absorption coefficient is 18 mm Balau (higher density) while the lowest is the 34 mm Nyatoh (lower density) without the presence of air gaps. With variation of air gaps present, Nyatoh shows the more substantial results in comparison with Balau whereby the absorption coefficient are significantly higher than the ones without air gaps. However, the overall absorption coefficient remains low (below 0.2) at all frequencies, regardless having different thickness, density and variation of air gaps of up to 3” 2011-09 Conference or Workshop Item PeerReviewed application/pdf en http://eprints.utem.edu.my/id/eprint/4150/1/paper_janatulv2.pdf Mohammad, Janatul Islah and Johari, Norhasnira and Said, Md. Radzai and Mohd. Nor, Mohd. Jailani (2011) Experimental results on sound absorption coefficients of Malaysian woods. In: International Conference on Noise 2011, 4-7 Sept 2011, Osaka Japan. |
| spellingShingle | TJ Mechanical engineering and machinery Mohammad, Janatul Islah Johari, Norhasnira Said, Md. Radzai Mohd. Nor, Mohd. Jailani Experimental results on sound absorption coefficients of Malaysian woods |
| title | Experimental results on sound absorption coefficients of Malaysian
woods |
| title_full | Experimental results on sound absorption coefficients of Malaysian
woods |
| title_fullStr | Experimental results on sound absorption coefficients of Malaysian
woods |
| title_full_unstemmed | Experimental results on sound absorption coefficients of Malaysian
woods |
| title_short | Experimental results on sound absorption coefficients of Malaysian
woods |
| title_sort | experimental results on sound absorption coefficients of malaysian
woods |
| topic | TJ Mechanical engineering and machinery |
| url | http://eprints.utem.edu.my/id/eprint/4150/ http://eprints.utem.edu.my/id/eprint/4150/1/paper_janatulv2.pdf |