Acoustical performance and physical properties of sound absorber with difference composition of natural rubber
Natural materials are turning into a substantial alternative option for traditional synthetic ones for acoustical treatments. Natural fibres often have great mechanical properties, have no harmful effects on health, and are available in large quantities often as a waste product of other production c...
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| Format: | Thesis |
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2016
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| Online Access: | http://eprints.uthm.edu.my/9165/ http://eprints.uthm.edu.my/9165/1/Mathan_Sambu.pdf |
| Summary: | Natural materials are turning into a substantial alternative option for traditional synthetic ones for acoustical treatments. Natural fibres often have great mechanical properties, have no harmful effects on health, and are available in large quantities often as a waste product of other production cycles. However, great demands for composite porous material contribute to the potential application of natural fibre as sound absorption panel. To assist in that effort, the research presented here studies the feasibility of using selected four kinds of natural fibres which are Ijuk, Kenaf, Coconut coir and Palm oil frond fibre blended separately with natural rubber as sound absorptive materials. Therefore, an experimental investigation was performed to evaluate the acoustical performance characterization and physical properties under qualify applied methods to obtain it. The natural fibres were processed with a combination of natural rubber at 0%, 20%, 30% and 40% composition, respectively. The samples were produced based on diameter size required by impedance tube (ASTM E1050) and the thickness remains at 50mm. The sound absorption coefficient (a), test results indicated that samples made by 20% of natural rubber as binder context exhibit optimum acoustical properties compared other mixing percentage. Among the four kinds of natural fibre, Ijuk exposed peak result on the sound absorption coefficient of 0.96 at low frequency 1000 Hz and 0.98 at high frequency 3000 Hz. Overall, the samples made by natural fibre with natural rubber combination were giving a better acoustical performance that outcomes more than 0.6 sound absorption coefficient value after the mid to high range frequencies to and by that it is capable of using in acoustical treatment especially in low frequency. Moreover, the influences of physical elements on acoustical performance are also described in this research study. |
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