| Project/Area Number |
18K18920
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 25:Social systems engineering, safety engineering, disaster prevention engineering, and related fields
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| Research Institution | Osaka University (2019-2020)
Kyoto University (2018) |
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Principal Investigator |
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| Project Period (FY) |
2018-06-29 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Keywords | 弾性波 / ガイド波 / 非接触計測 / レーザ / 周方向ガイド波 / センサ / 非破壊評価 / パイプ / 共振 / 非破壊検査 / レーザ超音波 |
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| Outline of Final Research Achievements |
This study starts for the purpose of detecting the wall thinning on the back side of a pipe using the elastic waves propagating in the circumferential direction of the pipe. Laser beam modulated and irradiated to the pipe specimens excited the elastic wave at the modulation frequency. Moreover, distinct resonance of the circumferential guided wave was measured, and the resonant patterns were broken at the defective area of a pipe, which shows the applicability of the circumferential guided wave to the detection of wall thinning.
Moreover, analyzing the resonant circumference guided wave with theoretical dispersion curves, calculation, and experiments proved that elastic wave is trapped at the groove of a pipe.
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| Academic Significance and Societal Importance of the Research Achievements |
円筒の周方向にガイド波が共振することを見出し，円筒（配管）裏面の減肉検査に利用できることを示した．さらに，円筒に溝部が存在する場合には，その円周ガイド波のエネルギが溝部に把捉されるという新現象を，理論解析および数値計算，非接触計測による実験により詳細に示し，高感度センサなど配管検査以外の広い用途があることを実証した．
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