1995 Fiscal Year Final Research Report Summary
Study on Optimum Position of Outriggers of Trimaran from Viewpoint of Wave Making Resistance
| Project/Area Number |
06651076
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶工学
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| Research Institution | Yokohama National University, Faculty of Engineering |
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Principal Investigator |
SUZUKI Kazuo YNU,Faculty of Engg., Associate Prof., 工学部, 助教授 (80111699)
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| Project Period (FY) |
1994 – 1995
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| Keywords | High Speed Ship / Trimaran / Nonlinear Programming / Wave Making Resistance |
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| Research Abstract |
In order to design high speed vessels on seaway, many ideas based on unconventional concepts are proposed in recent years. On the other hand, new concepts of high speed vessels based on the conventional desplacement type are also proposed and studied, for the purpose of sizing up and long distance voyage. In these vessels based on the displacement type concept, very slender hull forms are generally employed. For the hull of such type, however, stability problems are recognized so serious that a multi-hull, for example, a catamaran is well known as one of the solutions.
In the present studies, a trimaran with small outriggers at both sides are entroduced in place of the catamaran. In the case of the trimaran, the wave making interaction between the main hull and outriggers is expected to reduce the wave making resistance. Positions of small outriggers are optimized from the view point of the minimization of wave making resistance by means of nonlinear programming technique. As fundamental studies of the present problem, mathematical hull forms are employed as the main hull and outriggers. As more practical studies, the high speed hull form of slender displacement type proposed by Takarada et al.is also introduced as the main hull, and similar studies to the previous ones are carried out. In both studies, model tests based on the optimization results are carried out to verify the hydrodynamical effect of outriggers, including towing tests, wave analyzes, and measurements of trim and sinkage.
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