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Article type: Cover
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Published: December 30, 1986
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Article type: Index
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Published: December 30, 1986
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Article type: Appendix
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Published: December 30, 1986
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Katashi TAGUCHI, Mitsuo KISHI
Article type: Article
Pages
1-13
Published: December 30, 1986
Released on J-STAGE: April 01, 2018
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In this study, the authors propose a normative forecasting model for developing the national non-liner shipping in the developing countries. The model is composed of: 1) forecasting model for demand of marine transportation and 2) model for developing national fleet. In the forecasting model, an input-output analysis is applied for demand of marine transport because its intermediate demand is conformable to the transportation demand for non-liner shipping. By using an international input-output table, the trade of intermediate demand of a country concerned is evaluated, then it is converted into the origi-n-destination table in terms of ton-miles, National strategy on shipping should be evaluated by several criteria. In the model for developing national fleet, taking their importance into consideration, the following three criteria are introduced as objective functions, e.g. total investment in shipping, national share of marine transportation, and absorbing employment by national shipping and port & harbour sector. The above mutually conflicting considerations are to be built in a multi-objective optimization problem. The sequence of national share rate of marine transportation are the design variables. In this study, an interactive multi-objective programming method, that is an improvement of the surrogate worth trade-off method, is applied to search a preference solution systematically. To verify the idea, a case study is carried our for the case of Indonesia.
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Akira MASUMOTO, Masakazu NISHIMURA, Nobuyuki YAMAGUCHI, Shigeki TAGUCH ...
Article type: Article
Pages
15-19
Published: December 30, 1986
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A ship's container hold only with a mechanical ventilation system for carrying full of air cooled type reefer containers was the first attempt for us. Before an actual design and installation, a model test was carried out to verify that the system works in good order enabling a normal operation of the reefer containers After the ship's delivery to the Owner, an experimental on-board test was also carried out, Showing the system worked successfully and all reefer containers kept normal operation. Various kinds of data for future design and for further improvement of the system were obtained through the test.
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Akira KAKUGAWA, Yukio TAKEI
Article type: Article
Pages
21-26
Published: December 30, 1986
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The local propeller blade flows are measured by using a new LDV measuring system to obtain boundary layer profile on a propeller blade. Measurements are made on a five bladed propeller whose diameter is 0.4m in the cavitation tunnel of the Ship Research Institute. The newLDV measuring system consists of a one component, dual beam, backscatter LDV, signal processor and a data processing system. The velocity paralell to the geometrical pitch angle is measured by setting the measuring volume of the LDV at the section of the propeller blade. The mechanism for the boundary layer traverse is simply the rotation of the blade, since the LDV measuring volume remained stationary. The results are shown as equi-velocity contour curves and boundary layer profiles on the section of the blade It is found that the boundary layer growth with the increase of the chord of the blade section. The existence of separation bubble at the leading edge of the blade is made clear and verified by the flow visualization.
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Toshio AGAWA, Masaaki KUROI
Article type: Article
Pages
27-37
Published: December 30, 1986
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Theoretical and experimental study is carried out on a flap type wave energy converter. It consists of a caisson with a water chamber open offshore, a flap which is driven by waves and generrator system. Theoretical calculation without local wave term shows maximum efficiency is obtained when chamber depth (d) / wave length (L) equals to 0.25. Calculation with local wave term shows d / L arround 0.2 is best which coinside with the model test. Model test shows that optimum water depth (h) of the chamber is 4m for upper-hinge-type and is 3.5m for lower-hinge-type. Efficiency of wave energy conversion in irregular waves drops to 60% of that in regular waves. Lower-hinge-type wave energy converter is superior than upper-hinge-type in efficiency.
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Takeshi KINOSHITA, Kazuhito TAKAIWA
Article type: Article
Pages
39-46
Published: December 30, 1986
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Sectional drag coefficients of mooring chains in combined flow of current and oscillation are discussed, concerning current effects on dynamic reaction forces of slack chain mooring. It is shown that at high velocity ratio of current to oscillation the drag coefficients do not depend on the velocity ratio, therefore they depend only on Reynolds number, and that at low velocity ratio they depend both on Kc number defined by eq. (13) and on Reynolds number.
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Takeshi KINOSHITA, Hisaaki MAEDA, Celso K. MOROOKA
Article type: Article
Pages
47-53
Published: December 30, 1986
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Motions of moored barge and semi-submersible in waves are simulated using quadratic response transfer function computed from pressure integral over the wetted surface of the body. Some of them are compared with experimental data, and confirmed to follow them, provided the added mass and the damping force in still water are modified in waves. Further simulations show that the natural frequency appears in the motion besides a frequency of envelope of waves in case of low damping system like a moored barge.
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Akikazu NAKAMURA, Wataru YASUKAWA, Yoshiteru SAKAI, Ryotaro OGIWARA, T ...
Article type: Article
Pages
55-66
Published: December 30, 1986
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This is a report on stress analysis of a semi-membrane tank for an LPG carrier by an FEM program for contact problems. To precisely evaluate the necessary fracture strength of a cargo tank defined as Type B Tank in the IMCO Gas Carrier Code (the current IGC Code), it is indispensable to accurately analyse the stresses which will be caused in the cargo tank by various loads. However, unlike the independent tank, the usual linear elastic stress analysis method is not applicable in the semi-membrane tank, because its behavior depends on the clearance between the tank and its surrounding structures and on the frictional interaction force between them. Therefore, for the purpose of stress analysis of a semi-membrane tank for an LPG carrier, we developed an FEM program for contact provlems involving a thin -plate structure, and from a comparison between the results of the analysis by this program and those by various theories and experiments, we confirmed that the program developed has sufficient accuracy to evaluate the behavior of and stresses in an actual semi-membrane tank.
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Yoshiteru SAKAI, Hideo YAMASHIRO, Tsutomu HARADA
Article type: Article
Pages
67-72
Published: December 30, 1986
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This paper deals with the leak test for designing a partial secondary barrier of Semimembrane tank system (Tank type B) for an 100,000 m^3 LPG / NH_3 carrier. The leak test was performed using the liquid flon 12 (R-12). The material of the specimen used is KT-50N to be used for cargo tank. Several size of fatigue through cracks were made in the specimen and the leak rate was measured for each. During the measurement, three different static membrane tensile stresses and four different liquid pressures were applied to the specimen corresponding to the actual condition of the tank in service. In addition, the static bending stress was also applied in some cases to see its influence on the leak rate. The leak rate of actual cargo was estimated based on the result of the leak test.
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Shinsuke AKAGI, Ryohei YOKOYAMA, Koichi ITO
Article type: Article
Pages
73-80
Published: December 30, 1986
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An optimal planning method is proposed to design propulsion plants for LNG carriers. A combined plant composed of diesel engine and gas turbines is investigated as an example of energy saving propulsion plants. As this plant is composed of many kinds of equipment and several kinds of energy are supplied by their parallel operation, there exist many alternatives on the constitution and operational policy of equipment. The planning problem is considered as a combinatorial optimization one in which the optimal constitution and operational policy of equipment are determined together with the optimal insulation thickness of LNG tanks in order to minimize the total annual cost, and is solved numerically by the application of the branch and bound algorithm. Through a numerical study for a combined plant of actual scale, it is ascertained that the proposed optimal planning method is useful for the rational design of the plant which excels in long-term economy.
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[in Japanese]
Article type: Article
Pages
81-91
Published: December 30, 1986
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Article type: Appendix
Pages
93-95
Published: December 30, 1986
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Article type: Appendix
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App2-
Published: December 30, 1986
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Article type: Appendix
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Published: December 30, 1986
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Article type: Appendix
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Published: December 30, 1986
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Article type: Appendix
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App5-
Published: December 30, 1986
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Article type: Appendix
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App6-
Published: December 30, 1986
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Article type: Cover
Pages
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Published: December 30, 1986
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Article type: Cover
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Published: December 30, 1986
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