2023 Fiscal Year Final Research Report
Development of soundproofing materials for automobiles using cellulose nanofibers and acoustic metamaterials
| Project/Area Number |
21K03953
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 20010:Mechanics and mechatronics-related
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| Research Institution | Teikyo University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 音響 / 振動 / CAE / 吸音 / 遮音 / 有限要素法 / 音響メタマテリアル / セルロースナノファイバー |
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| Outline of Final Research Achievements |
For cellulose nanofibers, the sound absorption coefficient and flow resistance of Mr./Ms. pulled by spraying gel-like CNF on felt and drying it were measured. The peak frequency of the sound absorption coefficient moved to the low frequency side. It was confirmed that the flow resistance was positively correlated with the amount of CNF.
For acoustic metamaterials, PP was processed into a honeycomb structure, but a film was applied to the top and bottom, and transmission loss was measured by combining four types of hole patterns and three types of laminated patterns. By placing the rubber layer on the top, we were able to confirm that the sound insulation performance was greatly improved in all models. A finite element model similar to that of the test piece was created, and the calculation results were able to roughly reproduce the measurement results.
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| Free Research Field |
機械力学およびメカトロニクス関連
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| Academic Significance and Societal Importance of the Research Achievements |
セルロースナノファイバーに関して、従来の研究では樹脂などに混ぜて強度・剛性をUpする研究がほとんどであったところ、吸音に関する効果を実証できた。
音響メタマテリアルに関して、従来の研究では吸音に関するものが多かったが、他の材料と組み合わせて遮音に関する音響性能について解明出来た。
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