1992 Fiscal Year Final Research Report Summary
Prediction of the Seakeeping of High speed Ships
| Project/Area Number |
02402039
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶抵抗・運動性能・計画
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
OHKUSU Makoto Kyushu University Research Institute for Applied Mechanics Professor, 応用力学研究所, 教授 (70038537)
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| Co-Investigator(Kenkyū-buntansha) |
KYOZUKA Yusaku Kyushu University Interdisciplinary Graduate School of Engineering Sciences Prof, 総合理工学研究科, 教授 (80177948)
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| Project Period (FY) |
1990 – 1992
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| Keywords | High Speed Ship / Catamaran / Seakeeping / 流体力 |
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| Research Abstract |
Objective of this research is to develop a methodology to predict and evaluate seakeeping of high speed ships such as SES,SWATH and hydrofoil boats in the perspective of overcoming their vulnerability to the rough seas. The results are:
1. (1) We developed a new theory to predict hydrodynamic forces and wave exciting forces on high speed ships of catamaran hull form in waves at high Froude number. This theory accounts correctly the high speed effects on the hydrodynamic forces despite light computational loads compared with other sophisticated techniques. It is straightforward with this theory to incorporate the effect of hydrofoils attached to the main hull into hydrodynamic forces. (2) Validity of the theory was confirmed by model tests in the water tank. First we found that the added mass and damping coefficients of heave and pitch predicted by the present theory are in good corelation with those obtained by forced motion test. Characteristics of waves produced by the radiation and the diffraction of high speed catamaran were measured and analyzed by new experimental technique we developed. Those characteristics are closely related to added resistance of high speed ships in waves. They were confirmed to be correlated to the theoretical. (3) We developed a theory to predict the hydrodynamic forces acting on a hydrofoil running at high speed under waves with shallow depth of submergence. This can be easily combined with the theory described in (1) and (2). 2.We completed a computer program by which we can compute and evaluate the motions and wave forces of a catamaran running in oblique or short crested waves at very fast speed. This program is a useful tool to design high speed ships with better performances in a seaway.
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