2021 Fiscal Year Final Research Report
Study on novel sound absorbing material using acoustic metamaterial
| Project/Area Number |
20K22453
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0304:Architecture, building engineering, and related fields
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| Research Institution | Kindai University |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2022-03-31
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| Keywords | 3Dプリンター / 吸音材開発 / 音響メタマテリアル |
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| Outline of Final Research Achievements |
In this study, some micro-periodic structures using naturally occurring crystal structures and simple resonators as unit cells were designed. Their sound absorption characteristics at normal incidence were investigated by finite element analysis and experimental investigation of 3D-printed objects. The results suggest that parameter tuning of the unit cells enables various sound absorption characteristics. It is also found that a resonator-type unit cell with grids have stable and high sound absorption for low- and middle-frequency ranges. These findings suggest that the proposed structures lead to a good sound absorber with the desired characteristics depending on the situation.
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| Free Research Field |
建築音響，音響材料
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| Academic Significance and Societal Importance of the Research Achievements |
従来用いられてきたグラスウールなどの無機系多孔質吸音材には，重力等による性能劣化や，低域の吸音率の低さなどの問題があった．3Dプリンターの発展により近年着目される人工材料である音響メタマテリアルは，次世代材料として注目されているが，建築環境工学分野での応用例はまだ少ない．よって，本研究で，3Dプリンターを用いて所望の吸音特性をもつ様々な吸音材を作成できる可能性を示したことで，従来の吸音材の課題を解決した新たな音響材料開発の発展に寄与する．また，これにより，従来の施工条件に縛られない新たな室内空間の創出につながると期待される．
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