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Article type: Cover
Pages
Cover1-
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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Article type: Cover
Pages
Cover2-
Published: June 30, 1967
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Nobuo KUTARAGI, Tokuro MATSUMURA, Sadao IZAWA
Article type: Article
Pages
1-6
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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s/s "HOKUTO MARU", a training ship of Japanese Government, was converted to automatic operation of a main turbine, boilers and other machineries by Kawasaki Dockyard in 1966. Main conversion works are on the followings; a) Main turbine remote control system including program control, b) Automatic control system of main turbine warming, stand-by, and stop sequence operations, c) New installation of automatic combustion control of boilers, automatic sequence operation of soot blowers and new installation of atuo-burners, and d) Scanning monitor and logger. Nowadays we see a lot of newly built ships with automatic control system, however up to now grand conversion works to automatic operation of existing ships have been seldom carried out. As its reasons we can easily recognize some obstructions and problems; namely obstructions against modifications of existing machineries and pipes, problems of spaces in engine room, and specially big problems of cost and period. At our conversion works, we were actually confronted with many problems. These problems and main points of the conversion will be reported briefly.
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Shouichi SUDO, Takaaki TANIMOTO
Article type: Article
Pages
7-15
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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This paper studies wake data of large tankers arranged in order depending on a statistical method of analysis; this study is preparatory to investigations into model-ship correlation on wake fraction. An accurate correction for the scale effect, between models and ships, on wake fraction is a subject of practical and scientific importance. Wide scatter of wake data which have been so far assembled makes us confused when considering model-ship correlation. Accordingly, the character of the scatter was examined first, and great efforts were exerted to eliminate sources of systematic errors. The datathus put in order were analyzed by the Product Formula on the basis of several parameters which represent the characteristics of hull form and hull-propeller interaction. The form parameters finally adopted are as follows. C_<BA> : Aftbody block coefficient. L_R/B : Ratio of length of run to breadth. L_R/d : Ratio of length of run to draught. [numerical formula] : Area ratio of immersed midship section to propeller disk. ∇^<2/3>/D^2 : Ratio of 2/3 power of displacement to square of propeller diameter. The analytical results are presented in the formulae. [numerical formula] [numerical formula] For practical purposes, the following formula has been derived from above-mentioned formulae for the model-ship correlation. [numerical formula] Moreover, this is simplified as follows for convenience in the approximate use. 1-w_s/1-w_s=(C_<BA>^2×B/d)^<0.415>
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Yukiharu NEKADO
Article type: Article
Pages
16-22
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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This paper deals with comparative tests on the performance of an anti-rolling tank of the modified "Flume" type when a large oil-tanker is equipped with it. The purpose of the tests is to get food design data of the tank. The stabilizing action of the tank is derived from remarkable dissipation of energy. The dissipation is caused by the nozzle effect of holes in the longitudinal bulkhead, when the liquid in the tank oscillates through the bulkhead holes according to rolling. When this rype of anti-rolling tank is installed on a tanker, one or two cargo tanks of the tanker are utilized for the purpose. For the tests an anti-rolling tank model with two bulkheads was used and many kinds of bulkheads were prepared for change. The tank model was tested on a "Navipendulum", a rolling simulator and its angle was recorded over an assigned frequency range. As the results of the tests, two cases are successful for roll damping: one is a bulkhead with many small holes, and the other is a bulkhead with a vertical weir. Their frequency response curves show that the roll magnification factor becomes nearly constant and it is around 2.5. Some other cases are thought relatively good. Their response curves show that the magnification factor is relatively low and its peak value is about 3.0, while in the unstabilized condition it shows a much greater value at resonance. It is concluded that the ratio: area of opening in the bulkhead/area of the bulkhead is 0.20〜0.24 for effective damping. The liquid level is also an important parameter and its most effective height is 80 per cent of the tank depth from the viewpoint of roll damping and economy.
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Akihisa KOKUMAI
Article type: Article
Pages
23-28
Published: June 30, 1967
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(1) According to zig-zag tests of three sister super tankers with 0.82, 6.0 and 2.64 for C_b, L/B and B/d respectively, it was revealed that, even for the actual ships, so called abnormal patterns of K and T appeared contrary to our expectation. (2) It was confirmed by experiments on other ships that steering speed provided by the classification society regulations was unnecessarily severe for such large-sized tankers.
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Yukio UEDA, Taketo YAMAKAWA
Article type: Article
Pages
29-33
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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Recently, the effect of residual stresses on local buckling strength has been drawn their attensions of engineers in the field of steel structures. One of the authors has conducted the research to clarify the role of the residual stresses on buckling of plates under compression, and shear and presented several papers from which important effects were recognized especially for shear buckling. In this paper, the results of theoretical and experimental investigations into inelastic buckling of plates with residual stresses, including webs of built-up I-sections, under bending were presented. The result suggests that the effect of residual stresses is not so important on buckling of the plates in case of pure bending especially for webs of built-up I-sections.
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[in Japanese]
Article type: Article
Pages
34-37
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
38-43
Published: June 30, 1967
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[in Japanese]
Article type: Article
Pages
44-47
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
48-52
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
53-55
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
56-62
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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Article type: Appendix
Pages
63-65
Published: June 30, 1967
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Article type: Appendix
Pages
App1-
Published: June 30, 1967
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Article type: Appendix
Pages
App2-
Published: June 30, 1967
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Article type: Appendix
Pages
App3-
Published: June 30, 1967
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Article type: Appendix
Pages
App4-
Published: June 30, 1967
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Article type: Appendix
Pages
App5-
Published: June 30, 1967
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Article type: Appendix
Pages
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Published: June 30, 1967
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Article type: Appendix
Pages
App7-
Published: June 30, 1967
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Article type: Cover
Pages
Cover3-
Published: June 30, 1967
Released on J-STAGE: February 25, 2018
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