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Article type: Cover
Pages
Cover1-
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
Cover2-
Published: May 31, 1964
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Article type: Appendix
Pages
App1-
Published: May 31, 1964
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
1-8
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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Yoshio MURATA, Hisayoshi TATANO
Article type: Article
Pages
9-14
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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This report relates the results of study on improving the course stability of two small cargo boats by means of a pair of fins attached at the stern. Fig. 1 shows the arrangement of fins for Ship A. Provided a pair of fins, Ship A was perfectly stabilized. In case of Ship B, similar kind of fins named F_1 were fitted referring to the former experience but they were found to have quite a poor effect on the original purpose as compared with Ship A. Then, an experimental research on more effective fins was carried out with radiocontrolled model. We obtained the conclusions that : 1) It is an useful way to fit the course stabilizing fin of the present type on course unstable ships. 2) Even for unstable ships, the zig-zag test and its quasi-linear analysis are still applicable as well as for stable ships. 3) Models are generally much more stable on course than actual ships, as may be seen in Fig. 3. The difference of course stability between models and actual ships should be considered due to the scale effect on manoeuvering tests, and it is strongly desired to develop the research on the scale effect in manoeuvering tests.
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Masatoshi BESSHO, Toshiaki MIZUNO
Article type: Article
Pages
15-19
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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The authors carried out some propeller tests on a few sets of contra-rotating propellers making use of a newly-made contra-rotating propeller dynamometer. In this paper, the outline of the dynamometer is introduced, and some results are given.
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Masatoshi BESSHO, Toshiaki MIZUNO, Kenji DOKAI
Article type: Article
Pages
20-23
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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The behavior of three models which are moored in the uniform flow is observed, and important elements of the motion and the law of similarity are investigated. The results are summarized as follows ; 1) One of the dominant motions of the bodies is the pendulous motion across the stream, and the other one is longitudinal swing motion which is due to the change of the attitude. 2) For the amplitude of pendulous and pitching motion, and the slope of mooring cord, the Froude's law of similarity would be applied.
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Eiichi KAWASHIMA, Katsuto KANAO
Article type: Article
Pages
24-30
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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Marine engine data process equipment is being studied to cope with the rapid development of automation and remote control systems adopted in ships. Developed originally for land use, however, this equipment seems to have various problems yet to be studied with regards to the utility and economy for marine use. Author's study on various types of equipments best meets the required function. As to the surrounding conditions, each factor ; i.e., temperature, humidity, vibration and shock ; measured on board ships was analyzed and approximate standards established from the relations between each of those factors and reliability, life and cost.
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Norikazu ITOH
Article type: Article
Pages
31-37
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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The capacity of control valves is generally represented by Cv coefficient which is determined for water. So that, it becomes essential to make a correction of Cv when the valve is intended to use for highly viscous fluid. Under the circumstances each valve manufacturer has proper Cv correction formulae and graphic chart for his own products. However, it is not seldom to see from many actual installations that such correction is not satisfactory in the light of the designed working conditions of the piping, i.e. major deviation from the designed flow quantity and pressure drop in the piping. In order to develop more reasonable Cv correction method the author made a study on the empirical formula for resistance coefficient on JIS valves intened for the range of lower Reynolds Number which had recently been published by JIS Flow Resistance Committee, and the author could set up a tentative C_V correction formula incorporating correction factor K. Subsequently the author carried out a series of test to corroborate the accuracy of the developed formula with a satisfactory result, and made up a graphic chart R_e-K for C_V correction for practical use. The C_V correction factor K values otained by the author's formula substantially lies half way as compared with those by valve manufacturs and this, the author considers, means the developed formula does not include safety margin of the capacity, giving critical values which satisfies various conditions.
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Seiichi MORI, Itsuo KAWAI
Article type: Article
Pages
38-46
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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Recent world trend toward discontinued rationalization for the improved ship building ever requires development of a new technique over all branches of the modern naval engineering. New practice of cable installation for outfitting ships, discussed in this paper, represents a good apprpach to solve the technical problem, posed by the described engineering requirement. Unique merits of the proposed new technique of cable installation which meets all the considerd engineering requirements for efficient ship outfitting are discussed, and a comparison with various conventional methods are made. Practice of the said technique, mechanical strength and current limit of the installed, and technical data of the cable and installation materials are reviewed.
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[in Japanese]
Article type: Article
Pages
47-51
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
52-57
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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[in Japanese], [in Japanese]
Article type: Article
Pages
58-63
Published: May 31, 1964
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[in Japanese]
Article type: Article
Pages
64-69
Published: May 31, 1964
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[in Japanese]
Article type: Article
Pages
71-76
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
77-86
Published: May 31, 1964
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Article type: Appendix
Pages
87-89
Published: May 31, 1964
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Article type: Appendix
Pages
App2-
Published: May 31, 1964
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Article type: Appendix
Pages
App3-
Published: May 31, 1964
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Article type: Appendix
Pages
App4-
Published: May 31, 1964
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Article type: Appendix
Pages
App5-
Published: May 31, 1964
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Article type: Appendix
Pages
App6-
Published: May 31, 1964
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Article type: Appendix
Pages
App7-
Published: May 31, 1964
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Article type: Appendix
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App8-
Published: May 31, 1964
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Article type: Appendix
Pages
App9-
Published: May 31, 1964
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Article type: Cover
Pages
Cover3-
Published: May 31, 1964
Released on J-STAGE: February 24, 2018
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