1998 Fiscal Year Final Research Report Summary
Development of Improving System for Rolling and Maneuverability of a Displacement-Type Super High Speed Container Ship
| Project/Area Number |
08555243
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
船舶工学
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| Research Institution | Yokohama National University |
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Principal Investigator |
HIRAYAMA Tsugukiyo Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (00018061)
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| Co-Investigator(Kenkyū-buntansha) |
UENO Seiya Yokohama National University, Graduate School of Engineering, Associate Professo, 工学研究科, 助教授 (60203460)
MA Nin Yokohama National University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30251755)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Super High Speed Ship / Rolling / Control / Maneuverability / Fin / Moment of Inertia |
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| Research Abstract |
In recent years, super high speed large container ships are planned. In those ships, the transverse stability is considered to be weak, so that will disturb the performance of those ships. For this reason, the improvement of transverse stability is important for high speed displacement-type ship. In the same time list or heel by maneuver cannot be ignored, so this problem must be treated relating maneuvering characteristics simultaneously.
In this research, we proposed three anti-rolling systems and confirmed their feasibility by carried out numerical and physical simulations. One is downward vertical center fin, second is vertical upward air fin and the third is gyradius controlling system. For improvement of maneuverability simultaneously, we treated equation of motion with four degrees of freedom, namely surge, sway, yaw and roll.
In gyradius control system, small weight is controlled vertically, changing the transverse moment of inertia of the ship. Of course, this system changes the vertical position of the center of gravity of the ship , so the parametric oscillation must be avoided. As conclusion, those three systems were proved to be efficient system for improving rolling characteristics in waves.
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