著者

増田 光弘

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.88, no.812, pp.808-817, 2023-10-01 (Released:2023-10-01)

参考文献数

10

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The floating disaster prevention house (FDPH) was proposed, and conclusions about its disaster prevention performance were obtained as follows from this study.1. The floating unit can perform the floating performance regardless of the slit position and the slit area of the flood wall, flow velocity and elevating speed of the water level.2. The floating behavior of the floating unit can be reduced at the start of floating by setting up the clearance between the bottom of the flood wall and the floating unit.3. FDPH is expected to be less susceptible to fluid pressure and drifting objects.

著者

増田 光弘 南 清和 増田 光一 居駒 知樹

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.19, pp.61-68, 2014 (Released:2014-08-28)

参考文献数

13

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When the tsunami attacks in harbors, the vessels moored at a wharf may be unable to be evacuated. For example, it may happen the situations that the vessel is under cargo handling, the vessel has no crew or only foreign crew without knowledge of tsunami. In such a case, the following damages are assumed; breaking the mooring tether, grounding on a wharf, drifting to land areas and destroying buildings. This present paper describes the tsunami simulation and the motion analysis of vessel moored at a wharf using the MPS method (Moving Particle Semi-implicit method).In this research, the 3D-MPS method is applied. The chart of break of mooring tethers was created. The wave height of tsunami, draft of vessels and the relation of the break of the mooring tether were shown by the chart of break of mooring tethers. Then, the chart of break of mooring tethers is proposed for various scale of tsunami including the effect of incident angle of the mooring tether can be easily estimated against to the scale of tsunami and mooring system.

著者

増田 光弘 南 清和 増田 光一 居駒 知樹

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.25, pp.183-190, 2017 (Released:2017-09-06)

参考文献数

9

被引用文献数

1

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When tsunami attacks a harbor, the vessels moored at the wharf are exposed to a risk. For example, the following damages are assumed; breaking the mooring tether, grounding on a wharf, drifting to land areas and destroying buildings. In the previous report, the motion analysis of mooring vessels in tsunamis and the usefulness of tsunami protection measures by the install more mooring tethers (IMMT) was described using the MPS method. The incident wave angles of tsunami were used the 0 degrees (longitudinal wave) and 90 degrees (Transverse wave). For any incident angles, IMMT was effective. However, in the case of transverse wave of wave height 6.0m or more, it is possible to prevent the break of the mooring tethers, but it was confirmed that the vessels damaged by the grounding on a wharf. In the case of longitudinal wave, IMMT confirmed that it did not affect in some cases. It is influenced by the direction the mooring tether pulls. When the vessel moves, there are mooring tethers that are pulled or slacked. As a result, the mooring force does not act equally on the mooring tethers. Also, as an issue of existing papers, studies on oblique waves were not done. It is important to solve these issues.In this present paper, the influence of the oblique wave is studied. The extent of damage of longitudinal waves, transverse waves and oblique waves are compared through a numerical simulation method, the 3D MPS method. The 3D MPS method is used for numerical simulation. In this paper, quaternion is applied to the algorithm of rotational motion of the floating model. Furthermore, a more effective mooring method for longitudinal wave is proposed, and its effectiveness is demonstrated.

著者

増田 光弘 南 清和 庄司 邦昭

出版者

東京海洋大学

雑誌

若手研究(B)

巻号頁・発行日

2011-04-28

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荒天錨泊中の走錨による船舶の事故は、錨の研究が進んだ現在においても絶えることがない。原因の一つとして、現在使用されているJIS型錨やAC-14型錨はそれぞれ最大把駐力や姿勢安定性など構造的に課題点を抱えていることが挙げられる。本研究の目的は高性能な新型錨を開発することである。そのために、既存の錨の性能を再評価し、まとめた錨性能評価表を作成した。そして、錨性能評価表に基づいて高性能新型錨を設計・開発し、新型錨がどのような状況においても安定して性能を発揮することができる錨であることを確認した。