| 研究課題/領域番号 |
23K04265
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分24020:船舶海洋工学関連
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| 研究機関 | 国立研究開発法人海上・港湾・航空技術研究所 |
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研究代表者 |
山本 マルシオ 国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 主任研究員 (10608631)
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| 研究分担者 |
村井 基彦 横浜国立大学, 大学院環境情報研究院, 教授 (60292893)
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| 研究期間 (年度) |
2023-04-01 – 2026-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2025年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
2024年度: 2,210千円 (直接経費: 1,700千円、間接経費: 510千円)
2023年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
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| キーワード | Deep Sea Mining / Hangoff Riser / Mathieu Instability / Rigid Riser / Structural Optimization |
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| 研究開始時の研究の概要 |
We propose two structural reinforcements to reduce the axial tension of the vertical steel pipe that shall be used to produce manganese nodules in a water depth below 4,000m. However, it is unclear if such tension reduction could result in Mathieu's Instability. Thus, we will conduct experiments using reduced-scale models and simulations using Finite Element Analysis to verify the occurrence of this instability.
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| 研究実績の概要 |
In this research, we want to develop structural reinforcement to reduce the axial tension of a vertical steel riser pipe, which will produce manganese nodules in water depths of 4,000m or deeper. We will investigate whether the reduced axial tension may result in Mathieu's Instability on the riser pipe.
In FY2023, we simulated and experimented with the reference cases. In other words, we assumed a single pipe WITHOUT structural reinforcement for the simulation and experiment.
[Simulation] We simulated the single pipe riser and observed this instability in a riser pipe with reduced axial tension.
[Experiment] We developed the experimental apparatus to measure the strain on the pipe model. We used strain gauges to measure the strain.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
[SIMULATION] The simulation part progressed smoothly. We could simulate the single pipe riser (reference case). Further, we also observed Mathieu's instability when the axial tension was reduced.
[Experiment] The development and procurement of the experiment apparatus progressed smoothly. Our initial plan was to measure the axial strain with and without internal pressure. The problem was we could not purchase several high-pressure components to apply the internal pressure because of the shortage of such stainless steel components. Therefore, we only carried out the experiment without pressure.
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| 今後の研究の推進方策 |
In FY2024, we will carry out the experiment using the single pipe (FY2023 model) with internal pressure. In addition, we will develop and test a second model with structural reinforcement.
In the simulation, we will also develop a numerical model, including the structural reinforcement.
We plan to publish an article comparing the results of the single pipe and reinforced pipe.
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