A simplistic unit cell model for sound absorption of cellular foams with fully/semi-open cells

Yang, Xiaohu; Ren, Shu-Wei; Wang, W.B.; Liu, X.; Xin, Fengxian; Lu, Tianjian

doi:10.1016/j.compscitech.2015.09.009

Cited by 42 publications

(20 citation statements)

References 23 publications

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“…The low-frequency sound absorption efficiencies of materials by structure design were better but not good enough. At a frequency below 1000 Hz, the average sound absorption coefficient of materials with periodic structure [ 9 , 10 ], helical structure [ 11 ], or porous structure [ 12 , 13 ] was below 0.3, and the sound absorption coefficient was below 0.6 at a specific frequency. Furthermore, foam/film poly (ethylene-co-octene) composites with a multilayered structure had been reported, but the low-frequency sound absorption efficiency of the composites is poor [ 14 ].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the structural design of materials is another strategy to increase the sound absorption property. Many structures were investigated such as periodic [ 9 , 10 ], helical [ 11 ], porous [ 12 , 13 ], multilayered [ 14 ], and so on. Phonon crystal, a kind of material with a periodic structure, is deemed an ideal material to shield noise.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Sound Absorption Properties of a Barium Titanate/Nitrile Butadiene Rubber–Polyurethane Foam Composite with Multilayered Structure

et al. 2018

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Barium titanate/nitrile butadiene rubber (BT/NBR) and polyurethane (PU) foam were combined to prepare a sound-absorbing material with an alternating multilayered structure. The effects of the cell size of PU foam and the alternating unit number on the sound absorption property of the material were investigated. The results show that the sound absorption efficiency at a low frequency increased when decreasing the cell size of PU foam layer. With the increasing of the alternating unit number, the material shows the sound absorption effect in a wider bandwidth of frequency. The BT/NBR-PU foam composites with alternating multilayered structure have an excellent sound absorption property at low frequency due to the organic combination of airflow resistivity, resonance absorption, and interface dissipation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Sound Absorption Properties of a Barium Titanate/Nitrile Butadiene Rubber–Polyurethane Foam Composite with Multilayered Structure

et al. 2018

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“…This clearly would open new horizons for the material development by trying to develop correlations between the synthesis conditions and material properties [44]. In this respect, it important to recall that the inversion procedure involves a best fit of an experimental curve using a number of parameters, 5 for the JCA model, which can increase up to 8, according to the model considered [30,85].…”

Section: Acoustic Indirect Methodsmentioning

confidence: 99%

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Caniato¹,

D’Amore²,

Kašpar³

2020

Foams - Emerging Technologies

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Cellular foams are widely employed as insulation materials, both thermal and acoustic, often in competition with traditional fibrous insulation material, e.g., rock wool. As for the acoustic and thermal properties, several models have been developed to predict acoustic properties of poroelastic materials, but they are usually applied to fibrous layers or polyurethane foams, whereas their application to new materials like complex cellular foams has not been assessed due to the different cell microstructures. There is a very strong interest both in industrial and academic in developing novel insulation materials; accordingly, the possibility of ideally designing the cellular foam microstructure to achieve desired acoustic performances appears a highly attractive target. The paper will first discuss the state-of-the-art acoustic and thermal models and their application to cellular foam materials. Then a novel sustainable alginate-based foam material will be analyzed as a case study, by focusing the aspects related to their microstructure and acoustic properties. For the derivation of an acoustic model, the determination of the parameters of Johnson-Champoux-Allard (JCA) acoustic model (tortuosity, viscous characteristic length, thermal characteristic length, porosity, and flow resistivity) was performed using five different forecasting methods, including traditional analytical model for fibrous materials as well as inverse procedure.

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“…The large pores close to the sound source make acoustic waves easy to propagate into CGPCs, and thus the materials have less reflection and more propagated acoustic energy. The Johnson-Champoux-Allard model (JCA model) 45,46 has been adopted to simulate the acoustic wave propagation and estimate the performance of traditional porous materials, 47,48 and five parameters (i.e. porosity, flow resistivity, tortuosity, characteristic viscous length and characteristic thermal length) are needed in the JCA model.…”

Section: Sound Absorption Performance and Discussionmentioning

confidence: 99%

Experimental study on the sound absorption characteristics of continuously graded phononic crystals

Zhang

et al. 2016

AIP Advances

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Novel three-dimensional (3D) continuously graded phononic crystals (CGPCs) have been designed, and fabricated by 3D printing. Each of the CGPCs is an entity instead of a combination of several other samples, and the porosity distribution of the CGPC along the incident direction is nearly linear. The sound absorption characteristics of CGPCs were experimentally investigated and compared with those of uniform phononic crystals (UPCs) and discretely stepped phononic crystals (DSPCs). Experimental results show that CGPCs demonstrate excellent sound absorption performance because of their continuously graded structures. CGPCs have higher sound absorption coefficients in the large frequency range and more sound absorption coefficient peaks in a specific frequency range than UPCs and DSPCs. In particular, the sound absorption coefficients of the CGPC with a porosity of 0.6 and thickness of 30 mm are higher than 0.56 when the frequency is 1350–6300 Hz and are all higher than 0.2 in the studied frequency range (1000–6300 Hz). CGPCs are expected to have potential application in noise control, especially in the broad frequency and low-frequency ranges.

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A simplistic unit cell model for sound absorption of cellular foams with fully/semi-open cells

Cited by 42 publications

References 23 publications

Preparation and Sound Absorption Properties of a Barium Titanate/Nitrile Butadiene Rubber–Polyurethane Foam Composite with Multilayered Structure

Preparation and Sound Absorption Properties of a Barium Titanate/Nitrile Butadiene Rubber–Polyurethane Foam Composite with Multilayered Structure

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Experimental study on the sound absorption characteristics of continuously graded phononic crystals

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