Perforated closed-cell aluminium foam for acoustic absorption

Opiela, Kamil C.; Zieliński, Tomasz G.; Dvorák, Tomáš; Kúdela, S.

doi:10.1016/j.apacoust.2020.107706

Cited by 25 publications

(14 citation statements)

References 67 publications

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“…A scanning electron microscope was used for the observation of the surface , a large quantity of irregular tiny particles were distributed on the surface of closed-cell aluminum foam, and some broken structures, such as micropores and cracks, were observed in some areas. You can see from this point the cell pores of closed cell aluminum foam structure were not completely closed between them and from the outside, so it exhibited sound absorption performance to some extent before drilling [7][8][9][10] .…”

Section: Test Materialsmentioning

confidence: 99%

Study on sound absorption properties of closed cell aluminum foam with different microporous structures

Jiang

Wang

Lian

et al. 2023

J. Phys.: Conf. Ser.

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With the rapid development of modern society, environmental pollution is increasingly serious, among which noise pollution has become the world’s three major. At present, the methods to solve the noise problem are becoming more and more diverse. Among them, the use of porous materials for sound absorption and noise reduction is still one of the most important ways. Open-cell aluminum foam has high manufacturing costs and limited application scenarios. Therefore, some scholars have studied low-cost closed-cell aluminum foam, hoping to improve its sound absorption coefficient. Closed-cell aluminum foam is mainly used in sound insulation and has little sound absorption ability. For improving closed-cell aluminum foam sound absorption property, some scholars have researched the influence of mechanical perforation on the acoustic property of aluminum foam, but the sound absorption potential of small holes cannot be played due to the large aperture made during the process. Therefore, this paper designs and processes different aluminum foam sound absorption structures based on high-speed EDM technology and studies the effect of perforation aperture, perforation depth, and perforation rate on sound absorption peak value and sound absorption coefficient in low and middle-frequency bands (250HZ-2000Hz).

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Section: Test Materialsmentioning

confidence: 99%

Study on sound absorption properties of closed cell aluminum foam with different microporous structures

Jiang

Wang

Lian

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…The openness or closeness of pores affects the macroscopic properties such as bulk density, mechanical strength, and thermal conductivity. In sound absorption, open-cell materials are more efficient than closed-cell ones [10,11]. Polymeric foams are extensively used in various applications, including sound-absorbing materials, due to their favorable properties compared to counterpart materials.…”

Section: Introductionmentioning

confidence: 99%

Sound-absorbing porous materials: a review on polyurethane-based foams

et al. 2022

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In recent years, noise pollution has become one of the most critical human environmental problems. It has adverse effects on people's health and their work efficiency. Therefore, porous materials have gained enormous attention because they offer excellent sound absorption properties, low density, high specific strength, etc. In this review article, sound absorption in materials with specifically related properties such as sound absorption coefficient, sound absorption mechanisms, and types of metallic and non-metallic sound-absorbing foams are studied and discussed. Moreover, various kinds of porous polymeric materials are summarized, and in this respect polyurethane (PU) composite foams are represented with more details. Polyurethanes have several advantages such as reasonable physical, mechanical and thermal properties, acceptable processability, and chemical resistance. Polyurethane foam is a polymeric material with a cellular structure which makes it an effective sound absorber. Furthermore, various methods of preparing polymer foams are also presented. Different nanoparticles, synthetic and natural fibers are added to PU foam to enhance its acoustic properties. These additives and their effects on the sound absorption properties of PU foams are listed. Besides, various polymeric foam formation methods are explained with their advantages and disadvantages. Finally, discussion covers "porosity" as one of the most important factors on sound absorption properties of materials.

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“…Therefore, the research on sound absorption properties of closed-cell metal foams came into being. Opiela et al [15] studied the drilled closed-cell aluminum foam and found that it has sufficient sound absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Field Measurements for Traffic Noise Reduction in Highway Tunnels Using Closed-Cell Aluminum Foam Board

Zhang

Gong²,

Wan

et al. 2022

Applied Sciences

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In order to explore the sound absorption and noise reduction performance of closed-cell aluminum foam in the tunnel, the field test of the sound absorption performance of aluminum foam board was carried out based on the installation of aluminum foam board in the whole line of Haoshanyu Tunnel on Qinglan Expressway. Combined with the existing loudspeaker test and typical tunnel measurements, a new field test method for the noise reduction performance of closed-cell aluminum foam board was proposed for two different working conditions including fixed-point pure tone sound source condition and mobile vehicle sound source condition. The testing results of the new methods were analyzed, and it showed that the closed-cell aluminum foam has good sound absorption property at the frequency spectra between 250 Hz and 1000 Hz, and the farther away from the sound source, the better the sound absorption effect. In the research on the noise reduction effect of actual vehicle, it was found that the insertion loss of the closed-cell foam aluminum board is about 4 dB(A), which indicated that the closed-cell aluminum foam can play a certain noise reduction effect in the tunnel.

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Perforated closed-cell aluminium foam for acoustic absorption

Cited by 25 publications

References 67 publications

Study on sound absorption properties of closed cell aluminum foam with different microporous structures

Study on sound absorption properties of closed cell aluminum foam with different microporous structures

Sound-absorbing porous materials: a review on polyurethane-based foams

Field Measurements for Traffic Noise Reduction in Highway Tunnels Using Closed-Cell Aluminum Foam Board

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