Enhancement of sound absorption of coir fiber using thin layer of kapok fibers

Kassim, Dg Hafizah; Putra, Azma; Ramlan, Roszaidi

doi:10.1080/15440478.2022.2164103

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…Porous sound-absorbing materials are one of the most widely used sound-absorbing materials, which have good sound-absorbing performance in the highfrequency band, including fibers, [99][100][101][102] foam, [103][104][105][106] and particle [107][108][109][110] sound-absorbing materials. Within porous materials, there are a lot of tiny pores that link to the outside world and each other.…”

Section: Pvdf-based Porous Sound-absorbing Materialsmentioning

confidence: 99%

Research progress of piezoelectric polymer PVDF in sound absorption technology

Li,

Zhao,

Liu

2024

Textile Research Journal

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Owing to its impedance properties and piezoelectric effect, the piezoelectric polymer polyvinylidene fluoride (PVDF) finds application in the field of noise control. Traditional sound-absorbing materials have gradually fallen short of the demands of sound-absorbing functionality and environmental adaptability in today’s increasingly acute noise pollution environment. When PVDF is added to sound absorption, materials or structures have an additional loss path for the conversion of sound energy to electric energy. This helps to increase the low-frequency sound absorption band and improve low-frequency sound absorption performance. Through the action of viscosity, friction, relaxation, piezoelectric effect, and dielectric loss, the sound energy in the passive sound-absorbing material containing PVDF is transformed into energy dissipation in the form of heat energy, electric energy, and so on under the matching of PVDF low impedance. In active control, secondary sound and force sources can be supplied by PVDF-based transducers and actuators to reduce noise. This paper first provides an overview of the piezoelectric characteristics of β-phase PVDF and its optimization techniques. It then goes on to discuss the use of PVDF in passive sound-absorbing materials, active controls, and hybrid sound absorption systems. Finally, it summarizes the benefits, issues that still need to be resolved, and future directions for these three noise reduction techniques.

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Section: Pvdf-based Porous Sound-absorbing Materialsmentioning

confidence: 99%

Research progress of piezoelectric polymer PVDF in sound absorption technology

Li,

Zhao,

Liu

2024

Textile Research Journal

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“…There is a broad range of research focused on the use of natural fibers as sound absorbing materials. For instance, coir fiber has an absorption coefficient (α) of 0.84 at 500 Hz [9]; sugarcane bagasse has an α of 0.75 at frequencies ranging from 500 to 4000 Hz [10]; banana pseudostem fiber has an α of 0.89 at 6300 Hz [11]; areca nut leaf has a Noise Reduction Coefficient (NRC) of 0.74 [12]; kapok and coir fiber [13]; nettle fibers have an NRC of up to 0.72 [14]. Unfortunately, these natural fibers lack mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Abaca Fiber as a Potential Reinforcer for Acoustic Absorption Material at Middle-High Frequencies

Indrawati,

Yuwana,

Zainuri

2024

JRM

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Recently, abaca fibers have become the focus of specialized research due to their intriguing characteristics, with their outstanding mechanical properties being a particularly notable. In the conducted study, the abaca fibers underwent a preliminary treatment process involving an alkaline solution, which was composed of 0.5% sodium hydroxide (NaOH) and 50% acetic acid (CH 3 COOH). This process entailed immersing each fiber in the solution for a period of one hour. This treatment led to a 52.36% reduction in lignin content compared to the levels before treatment, resulting in a dramatic decrease in the full width at half maximum (FWHM) in the XRD spectra from 1.13 to 0.13. This change indicates that the fibers became more crystalline following the treatment. The abaca fibers were also characterized using BET (Brunauer Emmett Teller) measurements, which revealed that the average pore length ranged from 33-49 nm and the surface area was between 13-28 m 2 •g −1 . The morphology of the abaca fiber after alkali an hydrolisis treatment (AFAH) appeared rougher and more uniform. DMA measurements revealed a significant rise in the storage modulus of the single fiber post-treatment, with dependencies on both frequency and temperature. AFAH exhibited an optimal absorption coefficient of α = 0.9 for frequencies above 2500 Hz. The combined effect of alkalization and hydrolyzation treatments, while resulting in an enhancement in the mechanical properties of the fibers, also reduced high-intensity noise produced by sources such as machinery, aircraft takeoffs and landings, etc., across a broader working frequency range.

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“…Jute is a viable, economical, and biodegradable alternative to traditional https://doi.org/10.31881/TLR.2023.060 sound-absorbing materials for various acoustic applications. Studies have demonstrated that jute, coir, and blended natural fibres have the potential for acoustic applications, including domestic uses such as vacuum cleaning and refrigeration, as well as architectural applications as a sound-absorbing medium [17]. It was observed that as compared to the treated jute absorbents, untreated jute fibre displays superior sound absorption properties [18].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Characteristics of Jute and Coir Non-woven Fabric

Singh¹,

Kapoor²

2023

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Effective noise reduction is essential because it can influence the health and well-being of living organisms significantly, both physically and psychologically. This necessitates the use of appropriate absorbing materials to minimize the negative impact of noise. In recent years, there has been growing interest in using jute, coir and natural fibre-based acoustic materials in architectural and interior applications due to their exceptional acoustic properties, eco-friendliness, cost-effectiveness and widespread availability. The study focuses on analysing the effects of some scrutinised testing parameters of jute, coir and jute-coir blended non-woven fabric samples on noise reduction coefficient through observing sound absorption coefficient. The sound absorption coefficient was measured using the impedance tube method as per the ASTM E-1050 standard. The mean value of the sound absorption coefficient observed at frequencies 250 Hz, 500 Hz, 1000 Hz, and 2500 Hz was used to calculate the noise reduction coefficient. A three-factor & three-level Box–Behnken experimental design was used for designing research and non-woven jute, coir and jute coir blended fabric sample planning. The experimental work showed that with an increase in non-woven jute fabric sample thickness from 15 mm to 45 mm, blending jute 50 % with coir 50% and non-woven fabric samples tested by creating air gaps (15 mm to 30 mm) resulted in higher sound absorption coefficient and improved noise reduction coefficient. The experimental findings and statistical analysis revealed that blending jute with coir and increasing the thickness of non-woven fabric led to a significant improvement in the acoustic performance of the tested samples. However, increasing the air gap resulted in only a marginal improvement in acoustic performance.

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Enhancement of sound absorption of coir fiber using thin layer of kapok fibers

Cited by 9 publications

References 22 publications

Research progress of piezoelectric polymer PVDF in sound absorption technology

Research progress of piezoelectric polymer PVDF in sound absorption technology

Abaca Fiber as a Potential Reinforcer for Acoustic Absorption Material at Middle-High Frequencies

Acoustic Characteristics of Jute and Coir Non-woven Fabric

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