| Project/Area Number |
01302037
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| Research Category |
Grant-in-Aid for Co-operative 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 | Hiroshima University |
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Principal Investigator |
NAKATO Michio Hiroshima Univ. Engineering, Professor, 工学部, 教授 (20034324)
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| Co-Investigator(Kenkyū-buntansha) |
HIMENO Youji Osaka Prefecture Univ. Engineering Professor, 工学部, 教授 (50081394)
TANAKA Ichiro Osaka Univ. Engineering Professor, 工学部, 教授 (30028964)
KIJIMA Katsuo Kyushu Univ. Engineering Professor, 工学部, 教授 (90038042)
FUJINO Masataka Univ. of Tokyo Engineering Professor, 工学部, 教授 (10010787)
KATO Hiroharu Univ. of Tokyo Engineering Professor, 工学部, 教授 (00010695)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 1990: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1989: ¥7,900,000 (Direct Cost: ¥7,900,000)
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| Keywords | Semi-displacement craft, / Scale effect, / Form factor / Running attitude, / Wetted surface area, / Spray / 浸水面積 / トリム / 沈下 / 高速艇 / 高速艇の抵抗試験 / 高速艇の航走姿勢 / 高速艇のスプレイ / 高速艇の操縦運動モデル / 高速艇模型試験と表面張力 |
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| Research Abstract |
A resistance test program of a high-speed semi-displacement craft was performed. This work forms a part of the tasks of the High-Speed Marine Vehicle Committee of ITTC.
Analyzing the tests data, the following conclusions are obtained. The scale effect is not found in the wave resistance, and on the other hand, it appears in trim and spray observations. The form factor of frictional resistance can be determined even at high Froude numbers, by the method suggested by Hughes as a function of froude number. Appropriate turbulence stimulator for semi-displacement hull should be developed. The characteristics of semi-displacement hull forms in the range of medium Froude numbers are similar to those of displacement hull forms in many points. This means that the ITTC 1978 power prediction method, with practical modifications, would be applicable to this type of high-speed craft.
The effect of towing direction, variation of wetted surface area and aerodynamic effect due to the towing carriage do not make noticeable effects on the results of the resistance tests of this hull form.
Craft motion characteristics in waves can be estimated by applying a strip method.
In the maneuverability estimations of a high-speed craft, the change of attitude must be taken in to account.
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