Tailoring Acoustic Performances of Resin Reinforced Biomass Fiber-Based Panel with Single and Multiple Tailed Cavity Inclusions for Interior Work

Setyowati, Erni; Hardiman, Gagoek; Purwanto, Purwanto

doi:10.3390/fib7100085

Cited by 7 publications

(6 citation statements)

References 40 publications

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“…Higher number of pores on the fibre surfaces of EFB and MF treated with 3% of NaOH concentrations reduced the STL values compared to a few pores with only 2% of NaOH concentrations. Similarly, observations found by Setyowati et al [24], showed that kenaf fibre tend to have larger pores with channels appearing frequently on its surface than hemp fibre, which resulted in lower STL values for kenaf fibre than hemp fibre. EFB and MF treated with 3% of NaOH concentrations tend to have lower STL values than untreated fibre.…”

Section: Fig 5 -Stl For Efbsupporting

confidence: 68%

Sound Insulation Properties of Malaysian Biomass Waste Fibre UF Composites

Nasidi¹,

Ismail²,

Samsudin³

2022

IJIE

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Natural fibrehas a good capacity as acoustic insulation materials because of its characteristics, and therefore it is widely used in many applications. This research aims to explore biomass waste from the palm oil mill and coconut production as insulation materials. Fibre wastes used for this study included the empty fruit bunch (EFB), mesocarp fibre (MF) and coconut coir fibre (CF), which were treated using sodium hydroxide (NaOH) to eliminate excess oil and fibre surface impurities. The effect of the treatment was also considered to observe the effect towards the sound transmission loss (STL) performance of natural fibre. Three varying concentrations of NaOH (1%, 2% and 3%) were used to treat the fibre. The STL of EFB, MF and CF were measured using the impedance tube method with four microphones at frequencies from 160 Hz to 5,000 Hz. Pretreatment on EFB, MF and CF showed a decrement on the fibre diameter and changes on the fibre surface morphologies after examining using the scanning electron microscopy (SEM) analysis. The results showed that EFB, MF and CF treated fibre had higher STL performances than untreated fibre. The STL performances were increased by increasing the tested frequency from 160 Hz to 5,000 Hz. Changes in fibre morphology following the fibre pretreatment affected the STL performances of EFB, MF and CF. Additionally, treated MF using 2% of NaOH concentrations obtained the highest STL amongst all the test samples.

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Section: Fig 5 -Stl For Efbsupporting

confidence: 68%

Sound Insulation Properties of Malaysian Biomass Waste Fibre UF Composites

Nasidi¹,

Ismail²,

Samsudin³

2022

IJIE

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“…Setyowati et al concluded that the natural fibers in the composite are the potential to be implemented in architectural acoustics due to their specifications on reducing the sound energy absorption in certain frequencies [1], [2]. Figure 3 describes the performance of sound absorption of materials, which principally occur as the poor absorber.…”

Section: Sound Absorption Coefficientmentioning

confidence: 99%

“…This research not only focuses on porous hexagonal ceramic innovation by using water hyacinth powder in clay mixtures, in that it has the ability of absorption and material insulation but also compares the acoustic performance of porous ceramic with water hyacinth-based composites obtained in previous studies [1]. Meanwhile, several studies on acoustic materials from natural materials have also been carried out [2], [3].…”

Section: Introductionmentioning

confidence: 99%

The Acoustical Performance of Water Hyacinth Based Porous-Ceramic Compared to the Biomass Fiber Composites for Architecture Application

Setyowati¹,

Hardiman²,

Grafiana³

2021

cea

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The hyacinth plant (Eichhornia crassipes) is an aquatic weed that causes the silting of swamps. The water hyacinth research was developed because of concerns over the threat of biodiversity in swamps by utilizing water hyacinth for ceramic and composite mixtures. This current research highlights the comparative acoustical performances of ceramic and composite with water hyacinth contents. Dried water hyacinth was added to the clay ceramic mixture with a weight percentage of 2, 6, 8, and 10 wt%. The ceramic dough was then shaped hexagonally with an interlock system and molded overlay respectively before burning and biscuits, while the composite dough consisted of 200 ml polyester resin: 25 mg water hyacinth: 20 ml catalyst. The acoustic test methods refer to ASTM 1050-98 and ASTM E2611-09 for sound absorption and sound transmission loss respectively. The result showed that the 8 wt% water hyacinth mixture of porous ceramic had an average absorption coefficient of 0.29 and a sound transmission loss of a wide range of frequencies with an average of 59.1 dB. Meanwhile, the resin composite has a poor average of sound absorption of 0.10 -0.11 and 58.08 -58.36 dB on its STL. The innovation of the water hyacinth-ceramic, however, had a promising character as a Helmholtz-based diffuser-absorber.

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“…Noise refers to sound that interferes with the surrounding living environment, such as industrial noise [1], construction noise [2], traffic noise [3] and social activity noise [4]. Normally, the actual noise is in a wide frequency region [5], which requires the utilized sound absorber to be broadband [6][7][8][9][10]. Heo et al [6] utilized acoustic metasurfaces (AMSes) with high reflective characteristics to achieve significant noise reduction in tirepavement interactions over a broadband of acoustic frequencies under 1000 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…A novel sound absorber of acoustic metamaterial by the parallel connection of multiple spiral chambers that exhibit an extraordinarily low-frequency sound absorption performance in the frequency range of 360-680 Hz has been proposed by Duan et al [8], which was prepared by the low-force stereolithography of the photopolymer resin. Setyowati et al [10] studied the sound absorption performance of absorber-based biomass fiber-reinforced polyester resins, and it showed that a sample of a 15 mm single-tailed cavity kenaf fiber had a higher sound absorption and wider broadband frequencies than the hemp fiber, with a peak on 0.31-0.32 between 1.00-2.00 kHz. The achievement of broad low-frequency sound absorption performance promotes the application of acoustic metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Adjustable Sound Absorber of Multiple Parallel-Connection Helmholtz Resonators with Tunable Apertures Prepared by Low-Force Stereolithography of Photopolymer Resin

Yang

Shen

et al. 2022

Polymers

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The variable noise spectrum for many actual application scenarios requires a sound absorber to adapt to this variation. An adjustable sound absorber of multiple parallel-connection Helmholtz resonators with tunable apertures (TA–MPCHRs) is prepared by the low-force stereolithography of photopolymer resin, which aims to improve the applicability of the proposed sound absorber for noise with various frequency ranges. The proposed TA–MPCHR metamaterial contains five metamaterial cells. Each metamaterial cell contains nine single Helmholtz resonators. It is treated as a basic structural unit for an array arrangement. The tunable aperture is realized by utilizing four segments of extendable cylindrical chambers with length l0, which indicates that the length of the aperture l is in the range of [l0, 4l0], and that it is tunable. With a certain group of specific parameters for the proposed TA–MPCHR, the influence of the tunable aperture with a variable length is investigated by acoustic finite element simulation with a two-dimensional rotational symmetric model. For the given noise spectrum of certain actual equipment with four operating modes, the TA–MPCHR sample with a limited total thickness of 40 mm is optimized, which is made of photopolymer resin by the low-force stereolithography, and its actual average sound absorption coefficients for the frequency ranges of 500–800 Hz, 550–900 Hz, 600–1000 Hz and 700–1150 Hz reach 0.9203, 0.9202, 0.9436 and 0.9561, respectively. Relative to common non-adjustable metamaterials, the TA–MPCHR made of photopolymer resin can reduce occupied space and improve absorption efficiency, which is favorable in promoting its practical applications in the noise pollution prevention.

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Tailoring Acoustic Performances of Resin Reinforced Biomass Fiber-Based Panel with Single and Multiple Tailed Cavity Inclusions for Interior Work

Cited by 7 publications

References 40 publications

Sound Insulation Properties of Malaysian Biomass Waste Fibre UF Composites

Sound Insulation Properties of Malaysian Biomass Waste Fibre UF Composites

The Acoustical Performance of Water Hyacinth Based Porous-Ceramic Compared to the Biomass Fiber Composites for Architecture Application

Adjustable Sound Absorber of Multiple Parallel-Connection Helmholtz Resonators with Tunable Apertures Prepared by Low-Force Stereolithography of Photopolymer Resin

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