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Article type: Cover
Pages
Cover1-
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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Article type: Cover
Pages
Cover2-
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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Tatsumi KURIOKA, Hideshi TAKEUCHI
Article type: Article
Pages
1-8
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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The Japanese shipbuilding industry has achieved wide range of rationalization due to labor shortage and severe circumstances in economics. The effort for innovation must be directed first to reduction of production period and development of efficiency in operations. This paper describes successful examples of a shipyard production management regarding the beginning part of shipbuilding process. The authors, aproaching from an innovational viewpoint, have attained an improved procedure for scheduling and dispatching of steel materials, as well as a continuous flow-production system at marking, cutting and sub-assembing stages.
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Hideo TAKEDA, Tomoyoshi KUROI, Josuke YAMAGUCHI
Article type: Article
Pages
9-14
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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Extensive use is made of the copper alloy pipes in the way of ship's cargo oil tank heating coil arrangements as well as remote control piping systems, and all the pipe joints for them are formed by means of brazing. Conventional way of meeting the brazing heat requirement with oxigen-acetylene gas was not used without its criticism : it takes relatively skilled hand and consumes too much time in practice. In the light of growing demand for a simpler method which can provide greater safety and higher efficiency, two new brazing methods utilizing different sources of heat have been developed and engineered into practicality this time. Detailed description of the developments is given in the paper.
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Hideo TAKEDA, Tomoyoshi KUROI, Josuke YAMAGUCHI
Article type: Article
Pages
15-23
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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As one of the applications of high frequency induction heating to ship outfitting work, a new process of manufacturing large bore steel flanges has been developed and put into practical use. The conventional process of manufacturing flanges using forging or punching takes a long time, and so it has become necessary to rationalize it and improve its efficiency. The new hot working process of manufacturing flanges by bending and pressure butt welding using high frequency induction heating has made it possible to manufacture flanges with a higher efficiency and at a lower cost. This new process is introduced in this paper.
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Kazuo SHOMURA, Yoshiaki KAMAYA, Yoshitada KAWAGOE
Article type: Article
Pages
24-26
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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With respect to outfitting operations of machineries, technical method of rationalization, which set out from an attempt to do outfitting works inside the door, has now developed to the method of large unit assembling. The large unit worked out in the same arrangement as that as that of the whole floor plan in machinery space can be assembled in shop without being disturbed by any sort of obstacle, irrespective of stages of hull construction. Both the large unit method and the improved outfitting shops with versatile functions to control all the outfitting operations are the most important factors for progress of rationlization.
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Yukio UEDA, Masakatsu MATSUISHI
Article type: Article
Pages
27-32
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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The recent development in high speed digital computers has helped us to use a numerical approach, termed "the finite element method". The authors developed a method employing the finite element method for the calculation of elastic, elastic-plastic and plastic buckling of plate and applied the method to compressive buckling of plate having discontinuous boundary conditions and obtained quite satisfactory results. In the paper, the authors, using a conforming shape function and triangular finite elements, developed a method of analysis to the buckling problems. The method solves easily the buckling of plate with any complicated geometrical feature and gives a value converging to the exact value. As a typical example of the application, buckling of triangular bracket-type plates under various loading conditions was solved by the method and the solution was compared with the analytical solution obtained by the energy method. The rasult was quite satisfactory and verified the usefulness of the method.
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Shiro WATANABE
Article type: Article
Pages
33-36
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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An upper bound for the plastic collapse load of flat plates under uniformly distributed loads is studied. And, assuming that the deformations are convex at every parts, the minimum upper bound is determined by the following conditions. 1. Every deformed planes include edge lines. 2. Hinge lines are straight. 3. P=(∫_<s1>kMsds)/(I_1)=(∫_<s2>kMsds)/(I_2)……=(∫_<si>kMsds)/(I_i) P : Collapse load Ms=Mxsin^2φ+Mycos^2φ k=2 for fixed edges=1 for supported edges Ii=1/2∫_<si>r^2ds for fixed or supported edges =0 for free edges
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Kiyoshi IWAI, Masafumi MIYAMOTO
Article type: Article
Pages
37-44
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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When designing special ships such as LPG carriers, container ships, etc., it is necessary to estimte the maximum rolling angle at the initial stage of the design. For this purpose, we usually use the approximate formula √<(138rs)/N> stated in the Safety Regulation. However, it seems this formula cannot give an accurate estimation for large vessels with long rolling periods, since it is based on the resonance in beam seas. As for ship motions in oblique waves equations were demonstrated by Yamazaki and Fukuda. But they are too complicated to be used at the initial stage of the design. For this reason the authors attempt to introduce an approximate formula for calculating rolling angles in oblique irregular waves which can be easily adopted for the present purpose.
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Shiro WATANABE, Nobuo NAGAMATSU, Koichi YOKOO, Yoshiro KAWAKAMI
Article type: Article
Pages
45-51
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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Recently, remarkable improvement of anti-fouling paints has been achieved and anti-fouling effects against shells, barnacles, moss and grasses seem to be almost complete. However, slime (invisible thin film which collects on any surface in the first few days of immersion) adheres to these paint surfaces. In this paper, the effects of the slime on frictional resistance and the separation of slime by the flow are investigated by experiments of concentric cylinders, a model ship and rotating disks. By the extrapolation to actual ships from these test results, augmentation in total resistance due to slime is estimated to be about 9〜l0%, provided no separation of slime occurs.
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Article type: Appendix
Pages
52-57
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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Article type: Appendix
Pages
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Published: March 31, 1969
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Article type: Appendix
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Published: March 31, 1969
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Article type: Appendix
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App3-
Published: March 31, 1969
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Article type: Appendix
Pages
App4-
Published: March 31, 1969
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Article type: Cover
Pages
Cover3-
Published: March 31, 1969
Released on J-STAGE: February 25, 2018
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