Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples)
We conducted a study related to sound absorbing materials created by folding thin material in the shape of a Japanese folding fan. In order to conduct a calculation of the shape of a clearance in the folding fan-shaped test sample, we performed an approximation of element decomposition in both the i...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2015-11-01
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| Series: | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jamdsm/9/5/9_2015jamdsm0062/_pdf/-char/en |
| _version_ | 1811292325001822208 |
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| author | Shuichi SAKAMOTO Katsuya HIGUCHI Shota KOSEKI |
| author_facet | Shuichi SAKAMOTO Katsuya HIGUCHI Shota KOSEKI |
| author_sort | Shuichi SAKAMOTO |
| collection | DOAJ |
| description | We conducted a study related to sound absorbing materials created by folding thin material in the shape of a Japanese folding fan. In order to conduct a calculation of the shape of a clearance in the folding fan-shaped test sample, we performed an approximation of element decomposition in both the incidence direction of the sound wave and the lateral direction. In a theoretical analysis, we considered sound wave attenuation due to boundary layer friction in the clearance between two surfaces. We compared experimental and calculated values for the sound absorption coefficient. Trends in both matched closely. Errors in the calculated values for large clearances could be attributed mainly to irregularity in the size of the clearances. Frequency shift of the calculated values for small clearances were due to errors in estimating the sound attenuation. Sound absorbing structures shaped like a folding fan possess sound absorption characteristics are similar to the wedge-shaped sound absorbing structures shown in previous reports. This was also shown in calculated values based on theoretical analysis. In cases with an appropriate back air space, sound absorption peak frequencies decreased relative to cases without a back air space, and sound absorption characteristics were superior across a wide frequency range. |
| first_indexed | 2024-04-13T04:43:44Z |
| format | Article |
| id | doaj.art-d69137bc23994038903ef61d85b2efb6 |
| institution | Directory Open Access Journal |
| issn | 1881-3054 |
| language | English |
| last_indexed | 2024-04-13T04:43:44Z |
| publishDate | 2015-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| spelling | doaj.art-d69137bc23994038903ef61d85b2efb62022-12-22T03:01:55ZengThe Japan Society of Mechanical EngineersJournal of Advanced Mechanical Design, Systems, and Manufacturing1881-30542015-11-0195JAMDSM0062JAMDSM006210.1299/jamdsm.2015jamdsm0062jamdsmStudy of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples)Shuichi SAKAMOTO0Katsuya HIGUCHI1Shota KOSEKI2Department of Mechanical and Production Engineering, Niigata UniversityGraduate School of Science and Technology, Niigata UniversityGraduate School of Science and Technology, Niigata UniversityWe conducted a study related to sound absorbing materials created by folding thin material in the shape of a Japanese folding fan. In order to conduct a calculation of the shape of a clearance in the folding fan-shaped test sample, we performed an approximation of element decomposition in both the incidence direction of the sound wave and the lateral direction. In a theoretical analysis, we considered sound wave attenuation due to boundary layer friction in the clearance between two surfaces. We compared experimental and calculated values for the sound absorption coefficient. Trends in both matched closely. Errors in the calculated values for large clearances could be attributed mainly to irregularity in the size of the clearances. Frequency shift of the calculated values for small clearances were due to errors in estimating the sound attenuation. Sound absorbing structures shaped like a folding fan possess sound absorption characteristics are similar to the wedge-shaped sound absorbing structures shown in previous reports. This was also shown in calculated values based on theoretical analysis. In cases with an appropriate back air space, sound absorption peak frequencies decreased relative to cases without a back air space, and sound absorption characteristics were superior across a wide frequency range.https://www.jstage.jst.go.jp/article/jamdsm/9/5/9_2015jamdsm0062/_pdf/-char/ensound and acousticsnoise controlporous mediaabsorption coefficienttheoretical analysissilencer design |
| spellingShingle | Shuichi SAKAMOTO Katsuya HIGUCHI Shota KOSEKI Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) Journal of Advanced Mechanical Design, Systems, and Manufacturing sound and acoustics noise control porous media absorption coefficient theoretical analysis silencer design |
| title | Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) |
| title_full | Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) |
| title_fullStr | Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) |
| title_full_unstemmed | Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) |
| title_short | Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) |
| title_sort | study of sound absorbing materials using layered narrow clearances between two surfaces theoretical analysis and experiments of sensu folding fan shaped test samples |
| topic | sound and acoustics noise control porous media absorption coefficient theoretical analysis silencer design |
| url | https://www.jstage.jst.go.jp/article/jamdsm/9/5/9_2015jamdsm0062/_pdf/-char/en |
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