Airflow resistivity measurement and sound absorption performance analysis of sound-absorb cotton

Li, Xuewen; Xiong, Xinzhong; Pang, Jinxiang; Wu, Liang; Zhang, Heavy

doi:10.1016/j.apacoust.2021.108060

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…30 According to the value of a, the noise reduction effect of sound-absorbing materials is evaluated, and only materials with a greater than 0.2 can be called sound-absorbing materials. 31 The NRC is the arithmetic average of the practical a measured at four 1/3 octave frequencies of 250, 500, 1000, and 2000 Hz, with 0.05 as the minimum multiple. 32 It is mainly used as a nominal parameter for the commercial availability of sound-absorbing materials.…”

Section: Evaluation Methods Of Sound Absorption Performancementioning

confidence: 99%

The review of fiber-based sound-absorbing structures

Zhang

Gong

et al. 2022

Textile Research Journal

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According to the World Health Organization, noise pollution is second only to air pollution in its impact on health and the environment. Fiber-based sound-absorbing structures have great application potential in the field of sound absorption and noise reduction because they can provide a wider sound absorption range than traditional porous fiber materials, and at the same time have the advantages of light weight, low cost and strong processability. Consequently, significant research interest in the field of noise control has been directed into the study of composite sound-absorbing materials based on porous fiber materials. In this review, we have summarized manifold theoretical structures based on fiber materials, such as multilayer structure, porous micro/nano structure, membrane sound-absorbing structure and perforated resonance structure of fiber-based sound-absorbing structures, aiming to illustrate that the structure must affect the sound absorption performance of the material. The focus is on the research and development of the design concepts, and preparation methods of fiber-based acoustic structures are reviewed. Finally, this review concludes with the prospects and outlook for fiber-based acoustic structures. We hope that this article which reviews the structure design principle and preparation method of fiber-based sound-absorbing structures can give inspirations for readers.

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Section: Evaluation Methods Of Sound Absorption Performancementioning

confidence: 99%

The review of fiber-based sound-absorbing structures

Zhang

Gong

et al. 2022

Textile Research Journal

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“…The geometric parameters of the 9 fittings are presented in table 1. According to the parameters in table 1, the impedance of the additional fittings can be obtained from equation (6), and then the total surface impedance can be obtained by the calculation method of impedance series.…”

Section: Fem Simulation and Improvementmentioning

confidence: 99%

“…The design of sound absorbing materials [1][2][3][4][5] has always been an important topic in the field of noise control. Porous sound-absorbing materials [6,7] are widely used in conventional sound-absorbing materials, such as sponges and foams, showing excellent broadband sound-absorbing performance. However, their thickness is not acceptable for low-frequency noise reduction because the wavelength of the sound-absorbing band is proportional to its thickness [8].…”

Section: Introductionmentioning

confidence: 99%

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

Wang,

Hu,

Mao

et al. 2023

Phys. Scr.

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Broadband sound absorption is limited to discrete noise with abrupt peaks in the spectrum. Here, we proposed a mechanically adjustable acoustical metamaterials (AAMM) for low-frequency sound absorption with deep-subwavelength (0.025), which integrates Helmholtz resonators and Fabry-Perot (FP) tubes by precise modular design. The calculation results based on the theoretical model demonstrate that the broad low frequency (from 100 Hz to 500 Hz) tunability of the composite adjustable sound absorbing materials. The adjustable design scheme is further verified by numerical simulation. Then a multi-impedance adjustment method is proposed to improve the local optimal defect and make it have quasi-perfect sound absorption effect in the range of 120Hz-348Hz. The sound absorbing material sample can withstand 2.7 tons of dynamic load and 1300° high temperature, presenting superior compression and fire resistance compared to conventional porous sound absorbing materials and membrane acoustic metamaterials. This research on assembled machine-adjustable sound absorption material enriches the conventional acoustic metamaterial design scheme, further improves the space utilization rate, and provides an effective solution for dealing with low-frequency complex variable noise.

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“…According to any acoustic models and pore-elastic theory, higher open porosity values lead to a higher sound absorption coefficient, especially in higher frequencies. Porosity has a direct influence on the airflow resistivity that describes the sound absorption of the material [15,16].…”

Section: Introductionmentioning

confidence: 99%

Development of Composite Acoustic Panels of Waste Tyre Textile Fibres and Paper Sludge

et al. 2023

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Since society is moving towards sustainable development, interest in secondary use of waste has recently become significant. This paper investigates a process to develop an acoustic material, using two types of waste. Composite acoustic panels were developed using waste tyre textile fibres (WTTF) and paper sludge (PS), and polyvinyl acetate (PVA) were used as a binder. Non-acoustic (bulk density, airflow resistivity) and acoustic (sound absorption coefficient, sound transmission loss) parameters were studied. Composite acoustic panels with different proportions of WTTF/PS/PVA (sixteen samples) were subjected to testing for the sound absorption coefficient according to ISO 10534-2 and sound transmission loss according to ASTM E2611. The density of all samples varied between 155.2 and 709.9 kg/m3, the thickness between 14.4 and 20.5 mm, and the airflow resistivity between 29.5 and 101.5 kPa∙s/m2. The results reveal that the proportion of various waste materials in mixtures can improve the acoustic performance of panels. The combination that gives the highest αavg. with a value of 0.50 was experimentally found to be 70% WTTF mixed with 15% PVA and 15% H2O. The average sound absorption coefficient with a value of 0.46 was also found to be 25% WTTF mixed with 25% PS and 25% PVA and 25% H2O. In sound transmission loss, the most effective was 50% PS and the 50% PVA composite, the TLeq was 28.3 dB, while the composites together with 30% WTTF, 20% PS and 25% PVA, and 25% H2O showed 18.9 dB loss. The results obtained using WTTF and/or PS wastes are attractive and show great and promising development potential.

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Airflow resistivity measurement and sound absorption performance analysis of sound-absorb cotton

Cited by 11 publications

References 19 publications

The review of fiber-based sound-absorbing structures

The review of fiber-based sound-absorbing structures

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

Development of Composite Acoustic Panels of Waste Tyre Textile Fibres and Paper Sludge

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