Effect of non-acoustic properties on the sound absorption of polyurethane foams
In this paper the influence of non-acoustic properties on the sound absorption coefficient of polyurethane foams as a porous medium is investigated. Biot’s equations with transfer matrix method, as the solution approach are employed to evaluate the sound absorption coefficient of selected polyuretha...
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| Format: | Article |
| Language: | English |
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Iranian Society of Vibration and Acoustics
2015-07-01
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| Series: | Journal of Theoretical and Applied Vibration and Acoustics |
| Subjects: | |
| Online Access: | http://tava.isav.ir/article_15019_7486bd3ddeb58b42a0d4498f77e5012b.pdf |
| _version_ | 1797229285888491520 |
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| author | Mostafa Asadi Abdolreza Ohadi Reza Keshavarz |
| author_facet | Mostafa Asadi Abdolreza Ohadi Reza Keshavarz |
| author_sort | Mostafa Asadi |
| collection | DOAJ |
| description | In this paper the influence of non-acoustic properties on the sound absorption coefficient of polyurethane foams as a porous medium is investigated. Biot’s equations with transfer matrix method, as the solution approach are employed to evaluate the sound absorption coefficient of selected polyurethane foams. The major issue is the dependency of non-acoustic properties on each other which makes difficulties to examine the effect of parameters individually. Some facts from the results of previous works are used in order to overcome this prominent obstacle. The results show that increasing the porosity doesn’t have a great influence on the sound absorption coefficient and only for highly porous foams, raising porosity decreases the sound absorption performance. The increase of air flow resistivity up to an optimized value, intensifies the absorption capability. Furthermore, for partially reticulated (partially open cell) foams, the increase of tortuosity improves the sound absorption efficiency at lower frequencies. |
| first_indexed | 2024-04-24T15:10:10Z |
| format | Article |
| id | doaj.art-f97bc8e73cb740e3a2c6a1da96b518d0 |
| institution | Directory Open Access Journal |
| issn | 2423-4761 2423-4761 |
| language | English |
| last_indexed | 2024-04-24T15:10:10Z |
| publishDate | 2015-07-01 |
| publisher | Iranian Society of Vibration and Acoustics |
| record_format | Article |
| series | Journal of Theoretical and Applied Vibration and Acoustics |
| spelling | doaj.art-f97bc8e73cb740e3a2c6a1da96b518d02024-04-02T11:40:12ZengIranian Society of Vibration and AcousticsJournal of Theoretical and Applied Vibration and Acoustics2423-47612423-47612015-07-011212213210.22064/tava.2015.1501915019Effect of non-acoustic properties on the sound absorption of polyurethane foamsMostafa Asadi0Abdolreza Ohadi1Reza Keshavarz2M.Sc. Student, Acoustics Research Lab., Mechanical Engineering Department, Amirkabir University of Technology, Hafez Ave. 15875-4413, Tehran, IranAssociate Professor, Mechanical Engineering Department, Amirkabir University of Technology, Hafez Ave. 15875-4413, Tehran, IranPh.D. Student, Acoustics Research Lab., Mechanical Engineering Department, Amirkabir University of Technology, Hafez Ave. 15875-4413, Tehran, IranIn this paper the influence of non-acoustic properties on the sound absorption coefficient of polyurethane foams as a porous medium is investigated. Biot’s equations with transfer matrix method, as the solution approach are employed to evaluate the sound absorption coefficient of selected polyurethane foams. The major issue is the dependency of non-acoustic properties on each other which makes difficulties to examine the effect of parameters individually. Some facts from the results of previous works are used in order to overcome this prominent obstacle. The results show that increasing the porosity doesn’t have a great influence on the sound absorption coefficient and only for highly porous foams, raising porosity decreases the sound absorption performance. The increase of air flow resistivity up to an optimized value, intensifies the absorption capability. Furthermore, for partially reticulated (partially open cell) foams, the increase of tortuosity improves the sound absorption efficiency at lower frequencies.http://tava.isav.ir/article_15019_7486bd3ddeb58b42a0d4498f77e5012b.pdfPorous mediaPolyurethaneNon-acoustic propertiesAbsorption coefficient |
| spellingShingle | Mostafa Asadi Abdolreza Ohadi Reza Keshavarz Effect of non-acoustic properties on the sound absorption of polyurethane foams Journal of Theoretical and Applied Vibration and Acoustics Porous media Polyurethane Non-acoustic properties Absorption coefficient |
| title | Effect of non-acoustic properties on the sound absorption of polyurethane foams |
| title_full | Effect of non-acoustic properties on the sound absorption of polyurethane foams |
| title_fullStr | Effect of non-acoustic properties on the sound absorption of polyurethane foams |
| title_full_unstemmed | Effect of non-acoustic properties on the sound absorption of polyurethane foams |
| title_short | Effect of non-acoustic properties on the sound absorption of polyurethane foams |
| title_sort | effect of non acoustic properties on the sound absorption of polyurethane foams |
| topic | Porous media Polyurethane Non-acoustic properties Absorption coefficient |
| url | http://tava.isav.ir/article_15019_7486bd3ddeb58b42a0d4498f77e5012b.pdf |
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