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Article type: Cover
Pages
Cover1-
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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Article type: Cover
Pages
Cover2-
Published: September 30, 1966
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Yoichiro IZUMI
Article type: Article
Pages
1-7
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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A series of programs for "Determination of principal dimensions of tankers" through a digital computer has been established and put into practical use and, as the result, the daily desk work in the design office has been fairly reduced. The function of the present program is, in short, to determine the principal dimensions of tankers not only with neither excess nor deficiency from the basic requirements such as speed, deadweight and from the restrictions, if any, such as breadth etc. but also with the least expensive aspect. While computing, the problems which occur at the stage of the initial design, e. g., capacities of various spaces, trim, such length and disposition of the clean ballast tanks that conform to minimum I/y required by classification societies, freeboard, economical matters etc. are fully taken into account quite similarly to the process by the manual calculations. Thus, the former manual calculations as to the initial design have been programmed almost completely without significant omissions, and various values computed have also been ascertained to be quite close to those worked out by manual calculations. The output items are : Principal dimensions, outline of arrangement, capacities, weight of various items, relation between power and speed, freeboard, some economical figures, etc. Further, separate pages edited in such a format that can be delivered directly to the customers are also appended.
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Masatoshi OBI, Satoru KUROSE, Katsuzo TAGA
Article type: Article
Pages
8-13
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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In accordance with recent development of large oil tanker, the output of marine diesel engine has become larger, and also large quantity of lubricating oil has been required for such large diesel engine. Accordingly the screw pump which has been usually used for the lubricating oil pump is not able to circulate so much capacity of oil that is required by large diesel engine with one pump. Therefore three (3) sets of the screw pump should be installed for one vessel including one (1) stand-by pump. We recently made our subcontractor design and manufactured the tank mounted centrifugal lubricating oil pump of large capacity. This centrifugal pump is able to circulate every necessary capacity for large diesel engine, so it is sufficient to install two (2) pumps for one vessel including one (1) stand-by pump. And also this pump is superior at characteristics in lubricating oil service. This article states some merits due to the application of the tank mounted centrifugal lubricating oil pump of large capacity, in comparison with the screw pump.
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Shigeru AKAZAKI
Article type: Article
Pages
14-18
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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Dividing the turning quality of ships with rudders into the steering and the rotating qualities, three indices, J, J_θ and J_D are introduced.
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Hiroshi OKAMOTO, Hiromasa TAMAI
Article type: Article
Pages
19-24
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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As C_b and B/L of ships grow larger, their manoeuvrability usually become worse, and so does their operating economy. So far the better manoeuvrability was customarily obtained by adopting a rudder of large area. We planned to improve the ship manoeuvrability by using horizontal fins at the ends of the rudder, which virtually increase the rudder aspect ratao. Results of experiments at the open and the behind conditions show that the fins are effective as expected.
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Junkichi YAGI, Hiroaki OKADA, Katsumi MASUDA
Article type: Article
Pages
25-32
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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Recently, many cargo ships with hatches in two rows have been constructed, however, there are only few researches carried out on the behavior of center deck of these ships and the effective area of the deck was not always estimated with good accuracy. In order to evaluate the effective area of center deck, longitudinal strain distributions on the center decks of two cargo ships were measured at their launching and the test results were analysed theoretically. A method for calculating the effective area of center deck was shown and the various factors affecting on the efficiency of center deck were discussed.
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Yoshikazu MATSUURA, Hajime KAWAKAMI
Article type: Article
Pages
33-43
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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The authors investigate the torsional rigidity of thin-walled box girders with an opening, both theoretically and experimentally, as the fundamental research for the torsional problems of ships having large sized hatches. The torsional problem of box girders with an opening is treated in this paper as the "two-dimensional problem" instead of the so-called "bending torsion". Based on the theoretical result, a simplified method of calculation of the angle of twist is proposed, in which the bending-torsion theory is used with corrected end conditions. Torsion tests are conducted with steel models of thin-walled box girder and circular cylinder having an opening. Comparison of the results between the theory and the experiment shows fairly good agreement.
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Ikuo MIZUTANI
Article type: Article
Pages
44-53
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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In this paper, a technical investigation to prevent ship vibration by adding the other vibration is described, and the theoretical calculation made by an electronic computer is compared with the results of experimental works. An acrylite box floating on water was excited by an electromagnetic vibration generator, and this vibration was controlled by the other electromagnetic suppressor with the same frequency. The phase and the magnitude of the force originating from the suppressor and its position were changed so as to minimize the vibration at a point near the stern. An equation expressing the vertical vibration and its prevention, EI(∂^4Z)/(∂x^4)+ρA(∂^2Z)/(∂t)=δ(x-P_E)T_Ee^<iωt>+δ(x-P_S)T_Se^<i(ωl+ψ)> is presented, and its solution was theoretically obtained as follows, Z=G_e^<i(ωl+ψ)> This solution was used for the numerical calculation made by the electronic computer. The results were found to coincide with the experimental observation. In this study, the following conclusions can be summarized ; 1) When a beam model is tested as a ship for the vibration of six nodes or less, the suppressive force works satisfactorily to make the vertical vibration smaller at a point near the stern by selecting the position of the suppressor, the phase difference and the magnitude of the force generated by this suppressor. 2) When its magnitude is kept costant, the phase of the suppressive force is variable, not always π, and we can select the phase to minimize the vibration at a point near the stern. 3) Even when the phase selected by the procedure above mentioned is fixed, the magnitude of the suppressive force is not always same as that of the excited one, and we can select the magnitude of that forec to minimize the vibration on that point. 4) The suppressive force is advisably added at an edge of the stern or of the stem. When the force added at the loop of the excited vibration, it is a little less in amount than above to bring about the same effect. 5) When the number of node of the vibration is small and the frequency of the suppressive force is near or equal to the resonance frequency of the hull, the vibration can be bodily diminished. On the other hand, when the number of node is large, the vibration on the stem is increased. 6) Although the vibration of the hull is minimum at a point of the stern, it does not always small in amount at the other parts of the hull. Generally, it increases as the frequency of the vibration differs from the resonance frequency.
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[in Japanese]
Article type: Article
Pages
55-64
Published: September 30, 1966
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
65-74
Published: September 30, 1966
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Article type: Appendix
Pages
75-77
Published: September 30, 1966
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Article type: Appendix
Pages
App1-
Published: September 30, 1966
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Article type: Appendix
Pages
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Published: September 30, 1966
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Article type: Appendix
Pages
App3-
Published: September 30, 1966
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Article type: Appendix
Pages
App4-
Published: September 30, 1966
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Article type: Appendix
Pages
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Published: September 30, 1966
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Article type: Appendix
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Published: September 30, 1966
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Article type: Appendix
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Published: September 30, 1966
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Article type: Appendix
Pages
App8-
Published: September 30, 1966
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Article type: Cover
Pages
Cover3-
Published: September 30, 1966
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