Absorption of Sound Wave by Fabrics

Aso, Sadao; Kinoshita, Rikuhiro

doi:10.4188/transjtmsj1948.16.677

Cited by 5 publications

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“…Also note that fabrics with a higher SVF (especially base fabrics) have a maximum sound absorption coefficient value at lower frequencies with a relatively narrow sound absorption curve. A similar result was also found in Aso and Kinoshita’s work, 22 in which the sound absorption mechanism of the woven fabrics was analyzed. Fabrics having higher densities (corresponding to higher SVF in this study) showed a sound absorption coefficient peak at lower frequencies, then the sound absorption decreased with the increasing frequency.…”

Section: Resultssupporting

confidence: 86%

“…Fabrics having higher densities (corresponding to higher SVF in this study) showed a sound absorption coefficient peak at lower frequencies, then the sound absorption decreased with the increasing frequency. 22 This type of sound absorption behavior is mostly seen on resonant-type absorbers, such as membranes, 23,24 which have normally very high SVF values compared to fibrous materials. Resonant-type absorbers dissipate the narrow frequency band of sound energy at relatively lower frequencies with a characteristic absorption coefficient peak.…”

Section: Resultsmentioning

confidence: 99%

“…Sound energy dissipation occurs due to the vibration of the sample in the resonance-type absorption mechanism. 22,25

Figure 16.Sound absorption comparison of the two-pass raised fabrics. …”

Section: Resultsmentioning

confidence: 99%

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Investigating the effect of raising on the sound absorption behavior of polyester woven fabrics

Süvari

Dulek

2019

Textile Research Journal

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This work presents the results of efforts focused on the development of sound absorptive woven fabrics by the raising process. Four woven fabrics with rib and basket weave patterns were produced for the raising process. Micro-fiber-based polyester weft yarns were used in one set of rib and basket weave fabrics, while weft yarns comprising regular polyester fibers were used in the other set. Fabrics were subjected to dyeing and heat setting prior to the raising process. Fabrics were then passed one to three times through the raising unit in order to obtain fabrics with different voluminous characteristics and different quantities of fiber ends on the fabric surface. The mass per unit area, thickness, air permeability, and sound absorption coefficient of the fabrics were measured and surface images of the fabrics were taken. The solid volume fraction and airflow resistivity of the fabrics decreased significantly after the first and second raising passes. Increasing the number of raising passes up to two passes resulted in higher sound absorption (average increment of 20% at 5 kHz) in the higher frequencies at the expense of that in the lower frequencies. Sound absorption change beyond two passes was insignificant, though. The results demonstrated that raised fabrics having a lower solid volume fraction and airflow resistivity had better acoustical properties in the higher frequency region.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

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Investigating the effect of raising on the sound absorption behavior of polyester woven fabrics

Süvari

Dulek

2019

Textile Research Journal

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“…The theory and apparatus for measuring sound absorption coefficient are the same as those we used to measure the sound absorption coefficient of f abrics [3]. Sound absorption coefficients were measured from 250 c/s to 2000 c/s at intervals of 1/3 octaves generally.…”

Section: Methods Of Experimentingmentioning

confidence: 99%

Sound Absorption Coefficient of Glass Wool

Aso

Kinoshita

1966

Journal of the Textile Machinery Society of Japan

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This article presents the results of an investigation into the relation between the normal incident sound absorption coefficient and the apparent density of glass wool boards used as a sound absorbent.(1) Only one kind of glass wool boards 64 kg/m3 in apparent density and 2.5 cm in thickness out of 20 kinds made by 3 manufacturers has given a sound absorption characteristic belonging to the mixed type. The sound absorption characteristics of the other kinds of glass wool boards have been shown by experiment to belong to the viscosity-resistance type.(2) The relation between effective apparent density Dea (kg/m3) at which a glass wool board gives 1.00 in sound absorption coefficient and the thickness T (cm) is :Dea=aT -b where a and b are constants fixed by the manufacturer.(3) The relation among apparent density Da (kg/m3), thickness T (cm), distance d (cm) between the center of a sample and the rigid wall, and frequency f o at which the sample gives the maximum sound absorption coefficient is expressed by the following empirical formula : f0= (c/4-aD3a'T)d-' where a and t are constants and c is the speed of sound.

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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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Absorption of Sound Wave by Fabrics

Cited by 5 publications

References 0 publications

Investigating the effect of raising on the sound absorption behavior of polyester woven fabrics

Investigating the effect of raising on the sound absorption behavior of polyester woven fabrics

Sound Absorption Coefficient of Glass Wool

Acoustic Behaviour of Nonwovens

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