1993 Fiscal Year Final Research Report Summary
Study on Optimum Design Methods for Various Types of Ships
| Project/Area Number |
03302039
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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 Univ.Fac.Eng., Prof., 工学部, 教授 (30028964)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Kazuhiro Hiroshima Univ.Fac.Eng., Prof., 工学部, 教授 (90011171)
HIMENO Yoji Univ.Osaka Pref.Fac.Eng., Prof., 工学部, 教授 (50081394)
KAJITANI Hisashi Tokyo Univ.Fac.Eng., Prof., 工学部, 教授 (80010693)
SAITO Kimio Osaka Univ.Fac.Eng., Assoc.Prof., 工学部, 助教授 (50029279)
SUZUKI Tosio Osaka Univ.Fac.Eng., Prof., 工学部, 教授 (80029107)
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| Project Period (FY) |
1991 – 1993
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| Keywords | optimum design / minimum resistance ship form / minimum ship motion / non-linear optimization technique / SUMT method / GRG method / WIG / end plate |
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| Research Abstract |
Some optimizing methods are presented in order to design hull forms of various types of ships. The obtained results are the followings. 1. Minimum resistance ship form with bow and stern bulbs is developed by using a non-linear optimization technique, SUMT method.
(1) A ship form with bow and stern bulbs is more favorable in the aspect of wave resistance than the one with only bulbous bow.
(2) However, it is made clear by a model experiment that a large stern bulb causes flow separation and increase of viscous resistance. The estimation of separation zone is developed.
2. Optimum hull forms for ship motion in wave are obtained by using the so-called GRG method.
(1) The hull form minimizing the ship motion has smooth V-shaped sections in bow and stern part.
(2) However, the hull form minimizing the exciting force undulates greatly, while the force, Froude-Krylov force, is really minimum.
3. A preliminary theory to optimize the plane form of a WIG(Wing in ground-effects) is presented based on conservation law of fluid.
(1) Almost no effects of end plates at the leading edges of semi-elliptic plan form WIG are observed for suppressing out-flowing there, but increasing normal force.
(2) Fitting of about 30% length of end plates to the overall from the trailing edge is optimum for increasing normal force.
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