| Project/Area Number |
18K13691
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Toyama Prefectural University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 空力騒音 / 空力振動 / 渦構造 / スマートマテリアル / 磁気応答性エラストマ / PVDF / 弾性体 / 流体起因振動 / 流体起因騒音 / モード解析 / PIV / 後流 / 能動制御 / 光学計測 / 振動騒音 |
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| Outline of Final Research Achievements |
To elucidate the generation mechanism of flow-induced noise and vibration in elastic bodies, different types of elastic bodies were installed in a uniform flow of a wind tunnel. Subsequently, the noise and vortex structures generated around it were investigated. Furthermore, the noise was generated slightly upstream from the downstream edge of the elastic body. At this position, vibration occurs as the edge was rolled up and down, and noise with high directivity was generated in the direction perpendicular to the surface of the elastic body. We also fabricated a prototype of a vibration control device using soft smart materials, i.e., a magneto-rheological elastomer and PVDF, and investigated its vibration mitigating effect. Additionally, we proposed control algorithms for the device.
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| Academic Significance and Societal Importance of the Research Achievements |
これまで明らかとされていなかった流体中の弾性体の振動原理を、弾性体周囲の流れ場と発生する振動や音との関係から明らかにした。これにより、鳥類や昆虫、植物などが有する軟体部が風に曝された際に、どのように風の影響を回避しながら生息しているかを知るための一つの知見になったと考えられる。また、スマートマテリアルを利用した制御技術は、軽量・低消費電力の下に効果的に振動を制御できる可能性があるため、今後の産業界での利用が期待される。
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