Acoustic Properties of Multi-Layer Coir Fibres Sound Absorption Panel

Zulkifli, Rozli; Nor, Mohd Jailani Mohd; Tahir, Mohd Faizal Mat; Ismail, Al Emran; Nuawi, Mohd. Zaki

doi:10.3923/jas.2008.3709.3714

Cited by 132 publications

(56 citation statements)

References 11 publications

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“…The principle of measurement works in such a way that the sound source is generated by a loudspeaker at the end of the impedance tube; the sound waves are transmitted to the Zulkifh et al [14] studied the acoustic properties of multilayer coir fibres, and found out that the developed panels had a sound absorption coefficient of 0.70 -0.80 in the frequency range of 1000-1800 Hz.…”

Section: Acoustic Propertiesmentioning

confidence: 99%

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Rwawiire

Tomková

Gliścińska

et al. 2015

Autex Research Journal

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The quest for sound-absorbing materials that are not only environmentally friendly, but also sustainable is the foremost reason for natural fibre-acoustic materials. Bark cloth is a natural non-woven fabric that is largely produced from Ficus trees. An exploratory investigation of bark cloth a non-woven material and its reinforcement in epoxy polymer composites has been fabricated and investigated for the sound absorption properties so as to find the most suitable applications and also to see whether bark cloth can be used in some applications in place of man-made fibres. Three types of material species were investigated with their respective composites. The fibre morphology showed bark cloth to be a porous fabric that showed promising sound absorption properties at higher frequencies. The sound absorption results of four-layer material selections of Ficus natalensis, Ficus brachypoda and Antiaris toxicaria bark cloth showed sound absorption coefficient of 0.7; 0.71 and 0.91 at f > 6400 Hz, respectively. The bark cloth reinforced laminar epoxy composites had reduced sound absorption coefficients, which ranged from 0.1 to 0.35, which was attributed to decreased porosity and vibration in the bark cloth fibre network.

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Section: Acoustic Propertiesmentioning

confidence: 99%

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Rwawiire

Tomková

Gliścińska

et al. 2015

Autex Research Journal

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“…The use of natural fibers in the production of absorbent materials is not new, and numerous works have been published (Ballagh 1996;Zulkifli et al 2008;Koizumi et al 2002;Del Rey et al 2012;Navacerrada et al 2013;Díaz et al 2012). Absorbent materials based on natural fibers have also been favored, as natural fibers are biodegradable and modern technological developments have led to economically-viable and environmentally-friendly processing methods.…”

Section: Uses Of the Fique And Future Workmentioning

confidence: 99%

Characterization of a Material Based on Short Natural Fique Fibers

Navacerrada¹,

Díaz²,

Fernández³

2014

BioResources

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Fique is a biodegradable natural fiber derived from the Colombian Agavaceae family, originating in tropical America and traditionally used for the manufacture of packaging and cordages. Today, however, new uses are being developed. To meet the need for new good-quality, sustainable, low-cost construction materials for social housing, construction materials have been produced that combine different kinds of natural fibers, including fique, to improve their strength and physical properties. To assess these potential new construction materials made with fique fiber, we have characterized samples of different grammages and thicknesses manufactured using short fique fibers extracted from long fibers. We have measured the sound absorption coefficient at normal incidence in an impedance tube, air flow resistivity, and thermal conductivity as a function of grammage.

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“…Several researchers (Khedari et al, 2003;2004;Zulkifli et al, 2008) have succeeded in developing particle composite boards using agricultural wastes. Yang et al (2003) produced rice straw-wood particle composite boards which properties are to absorb noise, preserve the temperature of indoor living spaces and to be able to partially or completely substitute for wood particleboard and insulation board in wooden construction.…”

Section: Introductionmentioning

confidence: 99%

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

Zulkifli¹,

Zulkarnain

Nor³

2010

American Journal of Applied Sciences

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Problem statement: Noise control was one of the major requirements to improve the living environment. One of the methods to do that is provided by sound absorber. Commonly, multi-layer sound absorbers are applied to absorb broadband noise that was composed of perforated plates, air space and porous material. However, multi-layers sound absorbers effectiveness depends on their construction. This study was conducted to investigate the potential of using coconut coir fiber as sound absorber. The effects of porous layer backing and perforated plate on sound absorption coefficient of sound absorber using coconut coir fiber were studied. Approach: Car boot liners made from woven cotton cloth were used as type of porous layer in the study. This material has been used widely in automotive industry. Perforated plate used was machined with perforation ratio of 0.20, thickness of 1 mm and holed diameter of 2 mm. The samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, according to ASTM E 1050-98 international standards for noise absorption coefficient. Results: The experiment data indicates that porous layer backing can improve noise absorption coefficient at low and high frequencies with significant increasing. 20 mm thick layer coconut coir fiber with porous layer backing exhibit peak value at frequencies between 2750-2825 Hz with maximum value of 0.97. The experimental results also found that the coconut coir fiber with perforated plate gives higher value for lower frequencies range from 600-2400 Hz. The optimum value for coconut coir fiber with perforated panel is around 0.94-0.95 for the frequency range 2600-2700 Hz. Conclusion: Noise absorption coefficient of coconut coir fiber was increased at all frequency when they were backing with Woven Cotton Cloth (WCC). At low frequency, the NAC have significant increasing. This is because WCC have higher flow resistivity than coconut coir fibers, so that sound can be dissipated as it travels through material significantly. The results from the experimental tests show that it has good acoustic properties at low and high frequencies and can used to be an alternative replacement of synthetic based commercial product. By using the porous layer and perforated plate backing to coconut coir fiber, the sound absorber panel shows a good potential to be an environmentally friendly product. This innovative sound absorption panel has a bright future because they are cheaper, lighter and environmentally compare to glass fiber and mineral based synthetic materials.

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Acoustic Properties of Multi-Layer Coir Fibres Sound Absorption Panel

Cited by 132 publications

References 11 publications

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Characterization of a Material Based on Short Natural Fique Fibers

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

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