Sound absorption of multiple layers of nanofiber webs and the comparison of measuring methods for sound absorption coefficients

나영주,; Agnhage, Tove; Cho, Gilsoo

doi:10.1007/s12221-012-1348-5

Cited by 69 publications

(33 citation statements)

References 5 publications

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“…It is known that polymer nanofibres are flexible and they are easy to vibrate under acoustic waves 31 . However, fibre vibration caused by sound absorption is often localized, and fibre deformations in this case differ to those caused by compression or bending of a fibrous web because the mechanical deformation in the latter case spans the whole fibrous structure.…”

Section: Discussionmentioning

confidence: 99%

High-sensitivity acoustic sensors from nanofibre webs

et al. 2016

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Considerable interest has been devoted to converting mechanical energy into electricity using polymer nanofibres. In particular, piezoelectric nanofibres produced by electrospinning have shown remarkable mechanical energy-to-electricity conversion ability. However, there is little data for the acoustic-to-electric conversion of electrospun nanofibres. Here we show that electrospun piezoelectric nanofibre webs have a strong acoustic-to-electric conversion ability. Using poly(vinylidene fluoride) as a model polymer and a sensor device that transfers sound directly to the nanofibre layer, we show that the sensor devices can detect low-frequency sound with a sensitivity as high as 266 mV Pa À 1 . They can precisely distinguish sound waves in low to middle frequency region. These features make them especially suitable for noise detection. Our nanofibre device has more than five times higher sensitivity than a commercial piezoelectric poly(vinylidene fluoride) film device. Electrospun piezoelectric nanofibres may be useful for developing high-performance acoustic sensors.

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Section: Discussionmentioning

confidence: 99%

High-sensitivity acoustic sensors from nanofibre webs

et al. 2016

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“…In noise reduction materials, sound absorption material is very common and effective, which is widely used in the noise control engineering. In recent years, the study of porous sound absorption materials has been carried out and abundant achievements have been made (Duan, Cui, Xu, & Liu, 2012;Fouladi, Mohd Nor, Ayub, & Ghassem, 2012;Keshavarz & Ohadi, 2013;Na, Agnhage, & Cho, 2012;Shoshani, 1991;Xiang, Wang, Liu, Zhao, & Xu, 2013;Yilmaz, Powell, Lee, & Michielsen, 2012). Shaoshi (1991) studied sound absorption properties by combinations of multi-layers of non-woven fabric and single layer of woven fabric.…”

Section: Introductionmentioning

confidence: 99%

“…Keshavarz and Ohadi (2013) analyzed the transmitting mechanism of sound waves in porous fibers by Biot Theory, calculated the sound absorption coefficients by transition matrix, and finally explored the acoustic properties of compressed porous fibers by oblique incidence. Na et al (2012) found that sound absorption properties of nanofibers had an advantage over common fibers. With nanofiber layers accumulating, sound absorption coefficients improved.…”

Section: Introductionmentioning

confidence: 99%

Sound absorption properties of composite structure with activated carbon fiber felts

Shen

Jiang

2014

The Journal of The Textile Institute

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This paper is intended to study the influence of different factors on the sound absorption properties of composite structure with activated carbon fiber felts. Activated carbon fiber felts made from viscose fiber mats were prepared and later combined with perforated panels to form four different composite sound absorption structures. Based on the transfer function method, the impedance tube was used to test the sound absorption coefficients of composite structure in an acoustic range of 80-6300 Hz frequencies. Analysis was made to discuss the influence of such factors on the sound absorption properties as the position of activated carbon fiber felts, thickness, and air space. The results demonstrated that the composite structure displayed different sound absorption properties at different frequencies.Perforated panels played the dominant role in sound absorption by the occurrence of resonance at 80-3500 Hz frequencies, while porous materials contributed the most at 3500-6300 Hz frequencies. At 80-3500 Hz frequencies, the best performance could be observed in the third type of composite structure with changes in the position of activated carbon fiber; the first resonance frequency of the first type of composite structure and perforated panel structure was basically the same, and that of the remaining three types significantly shifted towards the low frequencies with the same scale. In smaller thickness range, with the increase in the thickness of activated carbon fiber felts, sound absorption coefficients of the first and second types of composite structure increased, the first resonance frequency of the first type showing no apparent shift towards the low frequencies compared with what was shown in the second type; but when the thickness arrived at 15.6 mm, sound absorption properties of the composite structure had similar traits to that performed by porous materials in an acoustic range of 80-6300 Hz frequencies. With the increase in the distance of air space, sound absorption properties were improving at 80-650 Hz frequencies but decreasing at 650-3500 Hz frequencies, the first resonance frequency moving towards the low frequencies. At 3500-6300 Hz frequencies, as the position of activated carbon fiber felts and the distance of air space varied, sound absorption coefficients were basically unchanged; while as thickness increased, sound absorption coefficients improved.

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“…A combination of an N‐G composite fabric improved the morphology of cells compared with the N‐N and N‐S composite fabrics (Figure S3), subsequently enhancing the vibration friction efficacy during sound wave transmission. Furthermore, needle punching rendered the nylon fabrics with densely entangled fibers, and the resulting small space among fibers decreased the air column vibration level and sound energy dissipation of acoustic waves …”

Section: Resultsmentioning

confidence: 99%

Sound absorption and compressive property of PU foam‐filled composite sandwiches: Effects of needle‐punched fabric structure, porous structure, and fabric‐foam interface

Zhang

Wang

et al. 2019

Polymers for Advanced Techs

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The flexible polyurethane (PU) foam-filled composite sandwiches are constructed using three types of needle-punched fabrics (upper layer), PU foam (core layer), and nylon (bottom layer). Different contents of deionized water were used to adjust the pore size and bulk density of PU foam by free-foaming. Effects of needlepunched fabric components, cell structure, and fabric-foam interface on sound absorption and compressive property of the composite sandwiches were investigated. Fabric-foam interface contributes to improve high-frequency sound absorption efficiency. When containing 0.5 wt% water in the core and nylon-glass grid needle-punched composite fabric (NPUN-G) in the upper face, the composite sandwiches exhibited optimal sound absorption of 0.78 at low frequency of 450 Hz, and optimal compressive strength of 14.4 kPa. Combination of needle-punched composite fabric improved the sound absorption coefficient and compressive strength, as high as 223% and 121%, respectively, compared with pure PU foam. This study provided an important basis for the preparation of high-strength composite sandwiches with low-frequency sound absorption.

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Sound absorption of multiple layers of nanofiber webs and the comparison of measuring methods for sound absorption coefficients

Cited by 69 publications

References 5 publications

High-sensitivity acoustic sensors from nanofibre webs

High-sensitivity acoustic sensors from nanofibre webs

Sound absorption properties of composite structure with activated carbon fiber felts

Sound absorption and compressive property of PU foam‐filled composite sandwiches: Effects of needle‐punched fabric structure, porous structure, and fabric‐foam interface

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