Sound Absorption Characteristics of Fiber Assemblies

Aso, Sadao; Kinoshita, Rikuhiro

doi:10.4188/jte1955.10.209

Cited by 9 publications

(10 citation statements)

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“…A number of studies have been carried out in sound absorption related nonwovens for assessment of the influences of structural factors [17][18][19][20][21]. The frictional resistance between fibres causes absorption of sound in nonwovens.…”

Section: Effect Of Sea Polymer Removal In Islands In the Sea Spun Bonded Non-wovenmentioning

confidence: 99%

Acoustic Behaviour of Nonwovens

Gokarneshan

2020

JTSFT

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Influence of Fibre Cross Section and Various Bonding Techniques Adopting TaguchiOwing to their high porosity and low solid volume fraction nonwoven materials are considered to be the most appropriate textile based sound absorbers for noise control applications. The solid volume fraction in majority of nonwovens could be 20% or less. The structure of nonwovens inherently has pores with tortuous paths, allowing the sound waves to enter through them. Various kinds of pores like 'open' or 'closed' can be present in a porous material [6]. 'Open' pored materials have a continuous channel of communication with the external surface of the body.The open-pored structure of nonwovens provides a proper medium for sound waves to be absorbed by three mechanisms which are: converting the sound energy into heat in the material, viscous losses because of the oscillating air flow entering the porous areas inside the material and vibration of fibers due to vibration of air particles caused by the sound waves [7]. Since nonwoven materials have a complex structure, there are many variables influencing

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Section: Effect Of Sea Polymer Removal In Islands In the Sea Spun Bonded Non-wovenmentioning

confidence: 99%

Acoustic Behaviour of Nonwovens

Gokarneshan

2020

JTSFT

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“…Many have investigated the effect of structural parameters on sound absorption behavior of nonwovens. 2–14 There is an abundant body of work focused on the influence of thickness, 3–8 bulk density, 5,9 fiber fineness, and shape 2,4–6,10–12 on the acoustical absorptive properties of the nonwovens. The overall conclusions from these studies suggest that fibrous structures with a high sound absorption coefficient require using finer fibers, 2,4–6,10–12 increasing bulk density 5,9 and/or thickness.…”

mentioning

confidence: 99%

“…The overall conclusions from these studies suggest that fibrous structures with a high sound absorption coefficient require using finer fibers, 2,4–6,10–12 increasing bulk density 5,9 and/or thickness. 3–8…”

mentioning

confidence: 99%

“…2,4–8,11–14 In this research, however, the interaction of the sound wave with the material is also taken into consideration in explaining the acoustic energy absorption of the high-loft nonwovens. Aso and Kinoshita 3,10 published several interesting papers in which the effect of the acoustic field was also considered. Although the materials that they examined cannot be regarded as nonwoven and the frequency range that they worked on is relatively narrow, their findings about absorption mechanisms of fibrous-porous assemblies are quite useful.…”

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confidence: 99%

“…Although the materials that they examined cannot be regarded as nonwoven and the frequency range that they worked on is relatively narrow, their findings about absorption mechanisms of fibrous-porous assemblies are quite useful. In one of their publications, 3 they prepared fiber assemblies by placing and packing nylon and viscose rayon fibers into small containers. The relationship between sound absorption and physical properties of these samples was investigated by measuring the sound absorption coefficients from 250 to 2000 Hz with an air gap behind the specimens.…”

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Sound absorption analysis of thermally bonded high-loft nonwovens

Süvari

Ulcay

Pourdeyhimi

2015

Textile Research Journal

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Sound absorption characteristics of specially designed high-loft nonwovens with minimum thickness were reported in this study. Three different polypropylene and polyester fiber-based high-loft, air-laid, and thermally bonded nonwovens varying in basis weight were produced. Heavier high-loft nonwoven samples at various thicknesses were formed using a specially designed mold. The sound absorption coefficients of samples with mass per unit areas ranging from 350 to 1575 g/m2 and with thicknesses ranging from 5 to 45 mm were measured. Acoustical absorptive behavior of the high-loft nonwovens was explained by analyzing the displacements of small air control volumes in a high-loft nonwoven and the air velocities in the impedance tube. Results indicate that the velocity and the total displacement of the small air volumes inside the fiber network have a major effect on sound absorption. High-loft nonwovens can be much more effective in terms of sound absorption if they are produced at the thickness at which average maximum velocity of the air is calculated highest. If there is a desire to absorb more acoustic energy, heavier nonwovens can be produced. It is suggested that relatively heavy nonwovens (from 700 to 1575 g/m2) can be produced thinner (5–10 mm) than the calculated thickness value based on the average maximum air velocity to get maximum sound absorption at lower thickness.

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