Study on Unstable Phenomena in Transverse Stability for High Speed Craft
| Project/Area Number |
05452310
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶工学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
KIJIMA Katsuro Department of Naval Architecture & Marine Systems Engineering, Kyushu University Professor, 工学部, 教授 (90038042)
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| Co-Investigator(Kenkyū-buntansha) |
FURUKAWA Yoshitaka Department of Naval Architecture & Marine Systems Engineering, Lecturer, 工学部, 講師 (90253492)
SHINKAI Akiji Department of Naval Architecture & Marine Systems Engineering, Associate Profess, 工学部, 助教授 (10112301)
OGAWARA Youichi Department of Naval Architecture & Marine Systems Engineering, Professor, 工学部, 教授 (20214033)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1994: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1993: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | High Speed Craft / Transverse Stability / Unstable Phenomena / Capsising / 横傾斜 / 傾斜モーメント / 復原力 |
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| Research Abstract |
It is well known that the transverse stability of a high speed craft might occur the unstable phenomena at running more than a certain speed even though the stability possess adequate static stability at rest condition. The phenomena of this kind are complex, and it will be difficult to investigate the mechanism of the phenomena.
This paper is to clear the mechanism of unstable phenomena of transverse stability in high speed craft. The numerical calculations for the dynamic pressure acting on ship's body were carried out on a model craft with ship's length 3.6m by using slender body theory of Maruo.
According to the results of numerical calculation, the heeling moment of the craft increased with ship speed increasing, specially with over Froud's number 0.8. This tendency on phenomena was verified by the model test.
From these investigations, one of the main reason for unstable phenomena in transverse stability is that the dynamic pressure acting on ship's body changes with ship speed increasing. Simultaneously the distribution of the dynamic pressure will change along to the longitudinal direction, then this pressure causes yaw moment.
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Report
(3 results)
Research Products
(6 results)
