Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation
Thin low-frequency acoustic absorbers that are economical to produce using a large-scale manufacturing process are scarce, and their efficiency is often limited to a narrow frequency range. In this paper, perforated gypsum foams are shown to achieve high absorption levels for layers thinner than 1/1...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127524009158 |
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| author | Bart Van Damme Théo Cavalieri Cong-Truc Nguyen Camille Perrot |
| author_facet | Bart Van Damme Théo Cavalieri Cong-Truc Nguyen Camille Perrot |
| author_sort | Bart Van Damme |
| collection | DOAJ |
| description | Thin low-frequency acoustic absorbers that are economical to produce using a large-scale manufacturing process are scarce, and their efficiency is often limited to a narrow frequency range. In this paper, perforated gypsum foams are shown to achieve high absorption levels for layers thinner than 1/15 of a wavelength. With a mass density of 150 kg/m3, they are as practical in use as conventional porous absorbers. To reach acoustic absorption levels higher than 0.7, perforations with a diameter smaller than 1 mm open a fraction of the initially closed pores. To allow additional design freedom, the foams' pore size can be varied between 1 and 3 mm, while keeping the wall thickness as low as 0.1 mm. Simulations of the microscopic fluid flow in a representative volume element show how the combination of foam properties and perforation patterns can be combined such that sub-wavelength absorption is obtained. Comparing the predicted sound absorption with impedance tube measurements demonstrates that the solution can yield a wideband low-frequency sound absorption peak. The most remarkable example exhibits an absorption peak higher than 0.7 between 525 Hz and 875 Hz for a layer of 25 mm, a result equivalent to 1/21 of the incident sound wavelength. |
| format | Article |
| id | doaj-art-88bdfb6489de405b85a51483d3564dff |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Materials & Design |
| spelling | doaj-art-88bdfb6489de405b85a51483d3564dff2025-01-09T06:12:21ZengElsevierMaterials & Design0264-12752025-01-01249113540Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptationBart Van Damme0Théo Cavalieri1Cong-Truc Nguyen2Camille Perrot3Empa, Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland; Corresponding author.Empa, Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, SwitzerlandUniv Gustave Eiffel, Univ Paris Est Créteil, CNRS, UMR 8208, MSME, F-77454, Marne-la-Vallée, FranceUniv Gustave Eiffel, Univ Paris Est Créteil, CNRS, UMR 8208, MSME, F-77454, Marne-la-Vallée, FranceThin low-frequency acoustic absorbers that are economical to produce using a large-scale manufacturing process are scarce, and their efficiency is often limited to a narrow frequency range. In this paper, perforated gypsum foams are shown to achieve high absorption levels for layers thinner than 1/15 of a wavelength. With a mass density of 150 kg/m3, they are as practical in use as conventional porous absorbers. To reach acoustic absorption levels higher than 0.7, perforations with a diameter smaller than 1 mm open a fraction of the initially closed pores. To allow additional design freedom, the foams' pore size can be varied between 1 and 3 mm, while keeping the wall thickness as low as 0.1 mm. Simulations of the microscopic fluid flow in a representative volume element show how the combination of foam properties and perforation patterns can be combined such that sub-wavelength absorption is obtained. Comparing the predicted sound absorption with impedance tube measurements demonstrates that the solution can yield a wideband low-frequency sound absorption peak. The most remarkable example exhibits an absorption peak higher than 0.7 between 525 Hz and 875 Hz for a layer of 25 mm, a result equivalent to 1/21 of the incident sound wavelength.http://www.sciencedirect.com/science/article/pii/S0264127524009158 |
| spellingShingle | Bart Van Damme Théo Cavalieri Cong-Truc Nguyen Camille Perrot Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation Materials & Design |
| title | Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation |
| title_full | Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation |
| title_fullStr | Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation |
| title_full_unstemmed | Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation |
| title_short | Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptation |
| title_sort | enhancement of the sound absorption of closed cell mineral foams by perforations manufacturing process and model supported adaptation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127524009158 |
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