A Review of the Factors that Influence Sound Absorption and the Available Empirical Models for Fibrous Materials

Dunne, Regan; Desai, Dawood; Sadiku, Rotimi

doi:10.1007/s40857-017-0097-4

Cited by 68 publications

(39 citation statements)

References 43 publications

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“…This parameter is the ratio of absorbed sound intensity to incident sound intensity on a surface [37]. The potential for materials to absorb sound energy depends on the following factors: density, thickness, porosity, fiber diameter, airflow resistivity, tortuosity, surface impedance, compression, air gap, and multilayers [19,38].…”

Section: Results Of Acoustic Testsmentioning

confidence: 99%

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Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties

et al. 2020

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In recent years, natural materials are becoming a valid alternative to traditional sound absorbers due to reduced production costs and environmental protection. This study explores alternative usage of sheep wool as a construction material with improved sound absorbing properties beyond its traditional application as a sound absorber in textile industry or using of waste wool in the textile industry as a raw material. The aim of this study was to obtain materials with improved sound-absorbing properties using sheep wool as a raw material. Seven materials were obtained by hot pressing (60 ÷ 80 °C and 0.05 ÷ 6 MPa) of wool fibers and one by cold pressing. Results showed that by simply hot pressing the wool, a different product was obtained, which could be processed and easily manipulated. The obtained materials had very good sound absorption properties, with acoustic absorption coefficient values of over 0.7 for the frequency range of 800 ÷ 3150 Hz. The results prove that sheep wool has a comparable sound absorption performance to mineral wool or recycled polyurethane foam.

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Section: Results Of Acoustic Testsmentioning

confidence: 99%

“…Many natural materials, such as bamboo, kenaf, sisal, flax, hemp, sheep wool, cork, or coconut fibers, show good sound-absorbing performance and can therefore be used as sound absorbers in acoustic rooms and noise barriers [19,20].…”

Section: Introductionmentioning

confidence: 99%

Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties

et al. 2020

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“…The Delany-Bazley empirical model as seen in Eqn. (4), was used to predict the sound absorption coefficient, since it is the most accurate model with regard to natural fibres [19]. The sound absorption coefficient, for each composite, was plotted using a developed Python script; this is depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Development and Sound Absorption Testing of a Poroelastic Kenaf/Sisal Fibre Composite Trim for Lowering of Vehicle Cabin Noise Levels

Dunne

Desai

Sadiku

2018

The International Conference on Applied Mechanics and Mechanica

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The automotive industry is under pressure to produce a product (vehicle) that is more recyclable and environmentally-friendly with a high fuel efficiency. At the same time, customers are looking for a vehicle that will provide them with a comfortable ride and low cabin noise levels. Therefore, the present work is concerned with the development and characterization of new poroelastic natural fibre-based sound absorbers, which have not yet been contemplated. This newly developed material is to be recyclable and in addition, be an environmentally-friendly alternative to synthetic absorbers which are currently used as internal trims in vehicles. Therefore, several sound absorber variants, based on the above, were developed and tested in order to select an optimally performing product. These sound absorbers are made of different ratios of kenaf and sisal fibres, which are held together by Acrylonitrile Butadiene Styrene (ABS) matrix. On evaluation of the results, it was found that the proposed sound absorbers have airflow resistivity and sound absorption coefficient values compatible to that of normal practice. KEYWORDS

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“…Meanwhile, movement between adjacent mediator molecules can produce viscous and friction forces, causing the energy wave to be dissipated after being converted into thermal energy (Kishor and Pawar, 2019). Along with the advancement of materials science, more and more composite materials have also been applied in the field of noise and vibration absorption (Dunne et al, 2017;Yang and Sheng, 2017;Zhao et al, 2018;Yang et al, 2019;Xie et al, 2020). Carbon nanocomposites, such as carbon nanofibers, carbon nanotubes, and graphenes, have become the most promising vibration and noise absorption composites, owing to their favorable compatibilities, excellent sound and vibration absorption properties, and wide wave absorption frequency band.…”

Section: Vibration and Noise Reduction Based On The Property Of Soundmentioning

confidence: 99%

Carbon Nanomaterials: A New Sustainable Solution to Reduce the Emerging Environmental Pollution of Turbomachinery Noise and Vibration

Jia

Miu

et al. 2020

Front. Chem.

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The vibration and noise that resulted from turbomachinery, such as fans, compressors, and centrifugal pumps, are known to bring considerable disturbance and pollution to the machine itself, the environment, and the operators. Hence, how to cope with the vibration and noise has become a recent research focus. With the advancement of materials science, more and more new nanomaterials have been applied in the field of noise and vibration reduction. To be specific, carbon-based nanomaterials, such as carbon fibers, carbon nanotubes, and graphenes, have achieved outstanding results. Carbon nanocomposites, such as carbon nanofibers, carbon nanotubes, and graphenes, are characterized by their low densities, high strengths, and high elastic moduli, all of which made carbon nanocomposites the most promising vibration and noise-reduction composites, thanks to their damping properties, compatibilities, noise and vibration absorption qualities, and wide wave-absorbing frequency bands. In light of this, this paper summarizes the progresses and application prospects of such carbon nanocomposites as carbon nanofibers, carbon nanotubes, and graphenes in the field of turbomachinery vibration and noise reduction.

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A Review of the Factors that Influence Sound Absorption and the Available Empirical Models for Fibrous Materials

Cited by 68 publications

References 43 publications

Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties

Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties

Development and Sound Absorption Testing of a Poroelastic Kenaf/Sisal Fibre Composite Trim for Lowering of Vehicle Cabin Noise Levels

Carbon Nanomaterials: A New Sustainable Solution to Reduce the Emerging Environmental Pollution of Turbomachinery Noise and Vibration

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