1989 Fiscal Year Final Research Report Summary
Study on the Optimum Design Method of Ship Stern Shape
| Project/Area Number |
63302038
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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 | Osaka University |
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Principal Investigator |
TANAKA Ichiro Osaka University, Faculty of Engineering, Professor, 工学部, 教授 (30028964)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Kazuhiro Hiroshima University Faculty of Engineering, Professor, 工学部, 教授 (90011171)
HIMENO Yoji University of Osaka Prefecture Faculty of Engineering, Professor, 工学部, 教授 (50081394)
KAJITANI Hisashi University of Tokyo Faculty of Engineering, Professor, 工学部, 教授 (80010693)
MATSUMURA Kiyoshige Osaka University Faculty of Engineering, Lecturer, 工学部, 講師 (10135668)
SUZUKI Tosio Osaka University Faculty of Engineering, Professor, 工学部, 教授 (80029107)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Optimization of ship form / Influence function / Frictional resistance / Viscous pressure resistance / Minimum resistance / Image processing |
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| Research Abstract |
The objective of the research is to develop an optimum design method of ship stern shape aiming at the high propulsive efficiency as well as the decreasing of stern vibration and noise.
Some of the main results obtained are as follows: The first approximation of the bounday layer characteristics was expressed by the explicit functions of the radius r_0, flatness C_1 and concaveness C_3, which are the Lewis form parameters. The approximate solution of the boundary layer equations gave fairy good agreement with the experiment. (2) An Attempt has been made to minimize the viscoms frictional resistance of full form ships. The method of the analysis is a newly developed influence function method utilizing Lewis form expression. A few % reduction in viscous frictional resistance has been found to be possible. (3) Following the same analytical technique as the frictional resistance, tile minimization of the viscons pressure resistance of full ships gave 2 % reduction of total resistance. (4) It is necessary to investigate into flow field for the objective of the research. For this purpose, a new method of the measurement of the flow velocity has been developed by utilizing visualization photographs in 2- and 3-dimensions. It is shown that the methods are promising.
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