Experimental and computational analysis of sound absorption behavior in needled nonwovens

Soltani, Parham; Azimian, Mehdi; Wiegmann, Andreas; Zarrebini, Mohammad

doi:10.1016/j.jsv.2018.04.007

Cited by 52 publications

(17 citation statements)

References 41 publications

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“…4 Previous efforts were focused on using cost-effective brous materials as the core components for constructing noise-absorber. [4][5][6] However, due to the inherent limitations of large ber diameter (usually >5 μm) and low porosity (typically <60%), the fatal defects of poor absorption of low-frequency noise that is easily produced by vehicles remain for the conventional micro brous noise-absorbing materials. [7][8][9] To address this problem, it is necessary to increase the thickness or density of the brous materials, while which in turn lead to high weights (>50 mg cm -3 ) and decreasing consumption of high-frequency sound waves.…”

Section: Introductionmentioning

confidence: 99%

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

Zong

Cao

Yin

et al. 2021

Preprint

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Traffic noise pollution has posed a huge burden to the global economy, ecological environment, and human health. However, most present traffic noise reduction materials suffer from a narrow absorbing band, high weights, and poor temperature resistance. Here, we demonstrate a facile strategy to create flexible ceramic nanofibrous aerogels (GCNAs) with hierarchically entangled graphene networks, which integrate unique hierarchical structures of opened cells, closed-cell walls, and entangled networks. Under the precondition of independent of chemical crosslinking, high enhancement in buckling and compression performances of GCNAs is achieved by forming hierarchically entangled structures in all three-dimensional space. Moreover, the flexible GCNAs show striking full-frequency noise absorption performances (noise reduction coefficient of 0.56 in 63~6300 Hz) and lightweight features (9.3 mg cm-3), together with robust temperature-invariant stability in –100~500 °C. This strategy paves the way for the design of novel fibrous materials for highly efficient full-frequency noise absorption.

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Section: Introductionmentioning

confidence: 99%

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

Zong

Cao

Yin

et al. 2021

Preprint

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“…[ 5–7 ] However, these materials, for their larger fiber diameter and monotonous internal structure, usually suffer from poor absorption properties of low‐frequency noise that features with low energy consumption in the transmission process. [ 8,9 ] In fact, low‐frequency noise is easily produced by traffic vehicles, and it poses a greater threat to human health than high‐frequency noise and can cause hearing loss, neurasthenia, and even damage to the cardiovascular system. [ 10–12 ] Therefore, enhancing the low‐frequency noise reduction properties of fibrous sound absorption materials is urgently needed.…”

Section: Introductionmentioning

confidence: 99%

Interlocked Dual‐Network and Superelastic Electrospun Fibrous Sponges for Efficient Low‐Frequency Noise Absorption

Zong

Cao

et al. 2020

Small Structures

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Traffic noise is a major source of urban noise pollution, with severe threats to the physiological and psychological health of humans. Fibrous sound absorption materials are extensively applied in the control of traffic noise pollution; however, the larger fiber diameters and monotonous internal structure of such materials result in poor low‐frequency sound‐absorbing properties or unsatisfied mechanical properties. Herein, a biomimetic and robust strategy to design ultrastrong and superelastic fibrous sound absorption sponges is reported, which is achieved by integrating a one‐step forming technique of interlocked micro/nano dual fiber networks and an in situ crosslinking approach. The obtained vine‐like interlocked structured fibrous sponges can withstand a tensile force 10 000 times their weight without deformation. Furthermore, the materials also show outstanding compression fatigue resistance and a lightweight feature (8.70 mg cm−3). Most importantly, the interlocked dual‐network‐induced stable fluffy‐stacked structure endows the fibrous sponges with an enhanced low‐frequency sound‐absorbing property (absorption coefficient of 0.93 at 1000 Hz), which is superior to those of commercial and reported sound absorption materials. In addition, the materials also possess good hydrophobicity and temperature resistance. This work opens new pathways for the further development of highly efficient sound‐absorbing materials.

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“…Küçük and Korkmaz (2012) tested eight different nonwoven composites, including different types of fiber mixed with different ratios. They report that sound absorption coefficient increases with increasing thickness and decreasing air permeability (Soltani et al , 2018). In their paper discussed X-ray computed tomography (MCT) tomography with fluid simulation techniques to predict the sound absorption properties of needled nonwovens.…”

Section: Introductionmentioning

confidence: 99%

Sound absorption of weft knitted fabrics: influence of fibers cross-section shape, stitch density and mechanical modification of surface

Saffari

Dolatabadi

Rashidi

et al. 2020

IJCST

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PurposeOne of the recent applications of fabrics is to use them for sound insulation. Accordingly, due to their low production cost and low relative density, fabrics have drawn attention in some of the industries such as the automotive and aircraft industries. The present study is aimed to investigate the effects of the fiber cross-section, porosity, thickness of samples and fuzzing of the knitted fabric on the sound absorption coefficient.Design/methodology/approachIn the present study, fabrics with three different stitch densities were knitted by yarns consist of three different forms of fiber cross-section shapes (circular, elliptical and plus-shaped). In this work, the sound absorption coefficient of knitted fabrics was investigated with regard to the different fiber cross-sections and structural parameters using an impedance tube.FindingsAs indicated by the obtained results, the cross-section, porosity, thickness and mass per unit area of the fabrics were the determinant factors for the sound absorption coefficient. In addition to, the sound absorption coefficient and porosity were shown to have an inverse relationship.Originality/valueA section of the present paper has been allocated to the investigation of the effect of the fiber cross-section and fuzzing of fabric on the sound absorption of plain knitted fabrics.

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Experimental and computational analysis of sound absorption behavior in needled nonwovens

Cited by 52 publications

References 41 publications

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

Interlocked Dual‐Network and Superelastic Electrospun Fibrous Sponges for Efficient Low‐Frequency Noise Absorption

Sound absorption of weft knitted fabrics: influence of fibers cross-section shape, stitch density and mechanical modification of surface

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