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Article type: Cover
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Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Published: December 25, 1960
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Article type: Appendix
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App1-
Published: December 25, 1960
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[in Japanese]
Article type: Article
Pages
1-
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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Toshio YOSHIDA, Hiromi NAKAI, Kan'ichi SUIZU, Akira YAMASHITA, Ta ...
Article type: Article
Pages
2-10
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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Devised and completed by Kawasaki Dockyard, the "Remotegraph" No.1 has just commenced its operation. It is a mechanical equipment for full-size marking and cutting by basing upon the miniature drawing on the 1/10 scale, such operations being carried out by remote control. It is indeed a high-speed machine especially with the principal object of marking. Dissatisfied with the existing "Monopol" and "Sicomat" which are slow-speed equipments mainly for gas cutting, the authors had been studying to turn out improved one for some time. Realizing that marking is not much limited by speed unlike gas cutting system, the authors hit upon the idea of perfecting the aforementioned equipment. With the appearance of this improved mechanical equipment, the manual processing method has been replaced with the improved system of using miniature molding, automatic marking by means of "Remotegraph" and cutting on the conveyor. The authors believe that the new device has brought about fast rationalization in the hull fabrication shop.
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Toshikazu YUGUCHI, Sizuo SIGENO, Taiji KATAZA
Article type: Article
Pages
11-23
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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In treatment of the natural frequency of the derrick post, we can calculate the frequency assuming the post as a continuous beam. In general the natural frequency of the derrick post is thereby calculated from the following equation, [numerical formula] in which λ_1 is influenced by many factors such as shearing force, rotary inertia, variation of cross section, accessory weight, with or without truss on the top of derrick post and condition of supporting points etc. We acquired λ_1 curve after the theoretical and experimental investigations for these factors. Then in the stage of initial design, we can design the derrick post which is free from the trouble of vibration.
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Seiichiro NISHIJIMA, Takehiko KIHARA, Kazuo ICHIKAWA
Article type: Article
Pages
24-31
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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In the service condition of a tug boat, the propeller must operate in various ship speeds, that is, in the conditions of ship moored at a shore, towing other ship and running alone. Therefore, the propeller of tug boat must be so designed that it develops full thrust force extending over a wide scope of ship speed. In the case the fixed pitch propeller is equipped, it is difficult to develop full power of the engine in whole range of ship speed on account of the restriction imposed by revolution and torque of the engine. When a controllable pitch propeller is used, however, the engine can develop its full power independently of the ship speed. From the above reason, some of shipbuilders in Japan equipped with controllable pitch propellers having powerfull towing pull and excellent maneuvering character in the last several years, in connection with the tendency to construct large size ships. In this paper, the results of bollard pull trial, towing pull trial and speed trial at free running of the tug boat "YOSHINO MARU" equipped with two controllable pitch propellers are described.
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Seikan ISHIGAI, Hiroshi YAMADA
Article type: Article
Pages
32-37
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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Shipbuilders and main engine makers indeed operate marine main engines at their test runs, but the test runs do not allow them to get all-round experiences of operation on board of actual ships. Actual experiences of engineers on board are not fully exchanged even among the engineers themselves. In view of this situation, the Kansai Society of Naval Architects planned and carried out an extensive survey on the actual operation of marine propulsion engines. The survey was concerned on the process of warming-up and cooling-down of main boilers and turbines, and the process of several operations of main diesel engines. In this first report is explained the result of the survey on warming-up and cooling-down of main boilers. It was found that the average speed of raising steam-pressure was 71℃/hour when expressed in the saturation-temperature raising speed. The variation among the reported speeds was, as might be expected, very large, and a ship was reported to have had its main boilers in excellent conditions for two years since its first voyage up to the time of the survey in spite of an exceptionally high speed of pressure raising of 480 ℃/hour.
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Fukuo SHIBATA, Takao ITOI
Article type: Article
Pages
38-43
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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This paper reports about parallel running of self-excited A.C. generators. Generally, on parallel running of A.C. generators, cross current compensators are used not to circulate the reactive current among generators. But the cross current compensator is not able to distinguish the cross current from the load current. Therefore, when generator supplies the power to lag P.F. load, even if the cross current wouldn't occur, the voltage across terminals of generator varies according to the load. This characteristic is not desirable. To operate generators in parallel on constant voltage characteristic, SK generator is developed by the authors. SK generator is a kind of the self-excited A.C. generators, of which the feature is differential coil wounded in potential and current transformer supplying the exciting current. In parallel running, the differential coils of each generator are connected to each other through the equalizer, and the automatic voltage regulator without the cross current compensator is provided only in one of running generators. Thus it is possible to operate the generators in parallel on constant voltage characteristic. This method is the most profitable for ship generators, because two or more generators are installed so close in each other that the equalizer may be installed easily and the instantaneous voltage drop is very slight, starting the induction motor of large capacity across the line.
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Masayuki YAMAMOTO
Article type: Article
Pages
44-51
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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This is a successive report for the thermal stress which does not obey Hooke's law. At first, the author has derived the fundamental equation under Cartesian co-ordinates and cylindrical ones, using the Dr. Nakagawa's stress and strain relation which was introduced several years ago, that is, ε=a^σ/(a-b^σ)(a+b'^σ), wherein ε is strain, σ stress and a, b, b' coefficients of the material. Then three dimensional problem of the thermal tangential and radial stresses in a thick cylinder has been dealt under the temperature difference between the cylinder walls and the action of hydraulic pressure working on both surfaces. Some numerical examples have been operated.
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[in Japanese]
Article type: Article
Pages
52-57
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
58-64
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
65-82
Published: December 25, 1960
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
83-
Published: December 25, 1960
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Article type: Appendix
Pages
App2-
Published: December 25, 1960
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Article type: Appendix
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App3-
Published: December 25, 1960
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Article type: Appendix
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App4-
Published: December 25, 1960
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Article type: Appendix
Pages
App5-
Published: December 25, 1960
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Article type: Appendix
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App6-
Published: December 25, 1960
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Article type: Appendix
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App7-
Published: December 25, 1960
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Article type: Appendix
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App8-
Published: December 25, 1960
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Article type: Appendix
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App9-
Published: December 25, 1960
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Article type: Index
Pages
1-4
Published: December 25, 1960
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Article type: Cover
Pages
Cover3-
Published: December 25, 1960
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