Sound Absorption Properties of DFs/EVA Composites

Lyu, Lihua; Liu, Yingjie; Bi, Jia; Guo, Jing

doi:10.3390/polym11050811

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…On the whole, different sizes of micropores are arranged together to form a horn-like (or hourglass-like) structure, which is conducive to the dissipation of acoustic energy. 15 When the mass fraction of gradient waste feather fiber is 60–60–60% and 60–50–40%, the high-frequency sound absorption performance is not as good as 40–50–60%. This is because the mass fraction of the waste feather fiber in the first layer of gradient sound absorption composite material is high, and the adhesion between PBS and waste feather fiber is reduced, so that the number of micropores formed inside is less, resulting in a decrease in high-frequency sound-absorbing performance.…”

Section: Resultsmentioning

confidence: 99%

“…It also holds the fibers together and protects them from mechanical and environmental damage. 13 The author of this article, Lyu et al, 14,15 analyzed the macromolecular structure, aggregate structure, and morphological structure of waste feathers; explored the relationship between feather structure and sound-absorbing performance; and proved that waste feather fiber has excellent sound-absorbing performance. By exploring the sound-absorbing properties of different gradient layers of composite materials, researchers have shown that gradient composite materials have better sound-absorbing properties than ordinary composite materials.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Properties of Gradient Sound-Absorbing Composites with Waste Feathers

Lyu,

Pan,

et al. 2024

AATCC Journal of Research

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To make full use of waste feather resources, waste feather fiber/polybutanediol succinate gradient sound-absorbing composites were prepared by a hot-pressing process with waste feather fiber as a reinforcing material and polybutanediol succinate as a matrix material. It can be applied to construction and other fields. The influence of gradient waste feather fiber mass fraction, gradient material density, and gradient material thickness on the sound-absorbing performance was studied, and the sound-absorbing mechanism of the material was analyzed. To determine the average sound-absorbing coefficient, maximum absorbing coefficient, and noise reduction coefficient as the evaluation index, the gradient sound-absorbing composites with waste feathers were compared with market common porous sound-absorbing materials with polyester fiber and wool fiber. The maximum sound-absorbing coefficient of the gradient sound-absorbing composites with waste feathers was 0.860; the average sound-absorbing coefficient was 0.408; the noise reduction coefficient was 0.393; and the noise reduction grade was IV. The sound-absorbing band was wide, and gradient sound-absorbing composites with waste feathers can be applied over a wide range.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Gradient Sound-Absorbing Composites with Waste Feathers

Lyu,

Pan,

et al. 2024

AATCC Journal of Research

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“…The thickness and density have considerable influence over airflow resistance and thus on sound absorption. Higher the thickness and density, the more effective was the sound absorption coefficient in the low and mid frequency ranges [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Sound Absorption Characteristics of Foxtail Millet (Setariaitalica) Husk

et al. 2020

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The current study deals with the analysis of sound absorption characteristics of foxtail millet husk powder. Noise is one the most persistent pollutants which has to be dealt seriously. Foxtail millet is a small seeded cereal cultivated across the world and its husk is less explored for its utilization in polymer composites. The husk is the outer protective covering of the seed, rich in silica and lingo-cellulose content making it suitable for sound insulation. The acoustic characterization is done for treated foxtail millet husk powder and polypropylene composite panels. The physical parameters like fiber mass content, density, and thickness of the composite panel were varied and their influence over sound absorption was mapped. The influence of porosity, airflow resistance, and tortuosity was also studied. The experimental result shows that 30-mm thick foxtail millet husk powder composite panel with 40% fiber mass content, 320 kg/m3 density showed promising sound absorption for sound frequency range above 1000 Hz. We achieved noise reduction coefficient (NRC) value of 0.54. In view to improve the performance of the panel in low-frequency range, we studied the efficiency of incorporating air gap and rigid backing material to the designed panel. We used foxtail millet husk powder panel of density 850 kg/m3 as rigid backing material with varying air gap thickness. Thus the composite of 320 kg/m3 density, 30-mm thick when provided with 35-mm air gap and backing material improved the composite’s performance in sound frequency range 250 Hz to 1000 Hz. The overall sound absorption performance was improved and the NRC value and average sound absorption coefficient (SAC) were increased to 0.7 and 0.63 respectively comparable with the commercial acoustic panels made out of the synthetic fibers. We have calculated the sound absorption coefficient values using Delany and Bezlay model (D&B model) and Johnson–Champoux–Allard model (JCA model) and compared them with the measured sound absorption values.

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“…The predicted value calculated by the model was in good agreement with the measured value, which proved that the heat conduction model was effective. According to the box-counting method fractal theory, Lyu [23] calculated the fractal dimension of discarded feather/EVA sound-absorption composite material. By Matlab programming, the fractal dimension between the mass and density of discarded feathers was calculated, and then the relationship between the fractal dimension and the maximum sound-absorption coefficient was derived quantitatively.…”

Section: Introductionmentioning

confidence: 99%

Sound-Absorption Performance and Fractal Dimension Feature of Kapok Fibre/Polycaprolactone Composites

et al. 2021

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This article introduces a kind of composite material made of kapok fibre and polycaprolactone by the hot-pressing method. The effects of volume density, mass fraction of kapok fibre, and thickness on the sound-absorption performance of composites were researched using a single-factor experiment. The sound-absorption performance of the composites was investigated by the transfer function method. Under the optimal process parameters, when the density of the composite material was 0.172 g/cm3, the mass fraction of kapok was 40%, and the thickness was 2 cm, the composite material reached the maximum sound-absorption coefficient of 0.830, and when the sound-absorption frequency was 6300 Hz, the average sound-absorption coefficient was 0.520, and the sound-absorption band was wide. This research used the box dimension method to calculate composites’ fractal dimensions by using the Matlab program based on the fractal theory. It analysed the relationships between fractal dimension and volume density, fractal dimension and mass fraction of kapok fibre, and fractal dimension and thickness. The quantitative relations between fractal dimension and maximum sound-absorption coefficient, fractal dimension, and resonant sound-absorption frequency were derived, which provided a theoretical basis for studying sound-absorption performance. The results showed that kapok fibre/polycaprolactone composites had strong fractal characteristics, which had important guiding significance for the sound-absorption performance of kapok fibre composites.

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Sound Absorption Properties of DFs/EVA Composites

Cited by 13 publications

References 11 publications

Preparation and Properties of Gradient Sound-Absorbing Composites with Waste Feathers

Preparation and Properties of Gradient Sound-Absorbing Composites with Waste Feathers

Elucidating the Sound Absorption Characteristics of Foxtail Millet (Setariaitalica) Husk

Sound-Absorption Performance and Fractal Dimension Feature of Kapok Fibre/Polycaprolactone Composites

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