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Article type: Cover
Pages
Cover1-
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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Article type: Cover
Pages
Cover2-
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
1-5
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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Motohiro YAMAOKA, Mitsuhiko UMEMURA, Yasuo KATAYAMA
Article type: Article
Pages
7-10
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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Mass Production System has been considered impossible to be adopted in the field of shipbuilding industry. The authors, at the stages of Hull Assembly and Subassembly, have adopted "Tact System" as a production system, and as a management system. They have also introduced a new system which is composed of "Grouping of Materials" and "Standardizing of Production Schedule." As the result of their efforts to combine the above production and management systems, they could get satisfactory efficiency in the process of constructon of large sized oil tankers.
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Wataru IKEDA, Michio ONO, Takehiko HAYASHI, Nobumasa HIRAISHI
Article type: Article
Pages
11-16
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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Approach to high speed gas cutting process has been tried by some researchers from different point of view. In spite of many efforts of those researchers, only a few processes have been developed. To apply this process to NC cutting, the authors performed basic research to a great extent and recently successful result has been obtained. Good cutting surface has been obtained by the high speed cutting when a supersonic curtain-divergent nozzle is kept vertically to cutting plane with high pressure oxygen at 5∼17kg/cm^2. Maximum cutting speed is over 4,000mm/min and is over two times as fast as conventional process. The authors describe the results of their basic studies on this method, and it's outline, although some part of this series of study is still under investigation.
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Takaaki ISHIHAMA
Article type: Article
Pages
17-21
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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It is an important job for ship designer to determine adequate scantling of primary supporting members. For this purpose, it is essential to investigate the structural behaviour of each member of ship structure in advance. The transverse strength of cargo tank has been fully investigated so far. However, few reports on the longitudinal strength of members which are, for instance, deck center girder, bottom center girder, etc. are not issued. Then, the author has analysed the bending moment and shearing force of longitudinal ring, which consists of deck center girder, bottom center girder and centerline vertical web on transverse bulkhead, regarded as grillage structure. And, by making use of the results of grillage calculation, the stress distribution around the bracket toe of centerline vertical web has been estimated by finite element method and good agreement has been obtained in comparison with experiment. In consequence, it will be possible to evaluate the strength of each supporting member in detail based on these results.
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Hiroo OKADA, Yoshio FUKUMOTO
Article type: Article
Pages
23-34
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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In this paper, the behavior of a plate with initial deflections under increasing compression and constant hydraulic pressure is investigated by means of the energy method. Numerical calculations are performed for a plate of the aspect ratio α=2 under uniform hydraulic pressure, and the effects of the magnitude, direction and form of initial deflections on buckling strength are discussed.
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Hiroshi TAGANO
Article type: Article
Pages
35-44
Published: December 30, 1972
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This paper gives the results of study on the form effects on viscous resistance of full ships. The form effects are divided into two components, one is the effect on frictional resistance and the other is on viscous pressure resistance. An investigation is made about the characteristics of the two components and it is shown that the main part of the form effect is on the pressure resistance. On the basis of this result a practical formula for estimating the form factor of full ships has been developed. A comparison of the calculated form factors with those by experiments shows a good agreement in a wide range of the ship form parameters. The formula is compared with several published ones.
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Ichiro TANAKA, Yoji HIMENO
Article type: Article
Pages
45-54
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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In this paper two methods using eddy viscosity hypothesis are presented for predicting incompressible two-dimensional turbulent boundary layers with arbitrary pressure gradients. In the first method the assumption of constant eddy viscosity in the outer layer along the normal to the wall is combined with a new auxiliary equation derived from the consideration of the behavior of equation of motion near the wall. The second method consists of the combination of an assumed distribution of eddy viscosity and the moment of momentum integral of the boundary layer equation. Comparison of calculated results with experiments shows fairly good agreement for usually encountered cases expect for the flows with strong pressure gradients.
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Toshio HISHIDA
Article type: Article
Pages
55-62
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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Wind waves is no other than free vibration of a water surface. Free vibration always takes the form of a dispersion wave train in Cauchy-Poisson's type. Each wave absorbs energy due to its build from wind, which serves for a negative resistance to the wave motion. This is a kind of self-excited vibration. Accordingly, the wave frequency or the wave length which specifies the fundamental characteristics of the wave obeys the rule of free vibration. Wind is not responsible for the wave length. The height of a wave is, however, settled in balance of natural reduction due to dispersion and amplification by the negative resistance.
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Norio TANAKA, YOJI HIMENO, Masato OGURA, Kazuo MASUYAMA
Article type: Article
Pages
63-71
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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To investigate the effects of forward speed on the rolling motion of ships, a number of free rolling tests with five models were carried out in which both the breadth of the bilge keels and the natural rolling period of models were varied systematically. The results are outlined as follows; The linearized non-dimensional damping coefficient κ generally increases with forward speed and has a slight hump-hollow undulation at F_n≒0.2, which seems due to the wave-making roll damping. The part of the coefficient κ which is ascribable due to the effect of the bilge keels remains nearly constant at forward speed. A considerable change in the natural roll period appears in the high speed range.
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[in Japanese]
Article type: Article
Pages
73-84
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
85-88
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
89-94
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
95-96
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
97-98
Published: December 30, 1972
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Article type: Appendix
Pages
99-101
Published: December 30, 1972
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Article type: Appendix
Pages
102-103
Published: December 30, 1972
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Article type: Appendix
Pages
App1-
Published: December 30, 1972
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Article type: Appendix
Pages
App2-
Published: December 30, 1972
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Article type: Appendix
Pages
App3-
Published: December 30, 1972
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Article type: Cover
Pages
Cover3-
Published: December 30, 1972
Released on J-STAGE: March 30, 2018
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