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Article type: Cover
Pages
Cover1-
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
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Published: March 30, 1962
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Fukuo SHIBATA
Article type: Article
Pages
1-6
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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Recently, the author invented a new speed control method for electric A.C. motors called "Shibata Reducer". This method of speed control can be carried out by using wound rotor type induction motors and a D.C. motor generator. The original type of "Shibata Reducer" was derived from Scherbius system which consists of an induction motor, rectifiers and an auxiliary motor generator. We can find wide application of Shibata Reducer in industrial circles, and especially in vessels its splendid applications for deck machineries, i.e., for winches, windlass and so on. This method can also used in dredgers for the control of cutter motors, main pumps and swing winches. I believe that "Shibata Reducer" will be used for deck machineries of almost all vessels and dredgers of the world in near future. The valuable application of "Shibata Reducer" is in using a common motor generator for plural induction motors.
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Kanji URAKI, Minoru YAMADA, Keiji TSUJINO
Article type: Article
Pages
7-21
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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This paper deals with the following two items relating to the vibrations of marine propeller shafting. 1) From the viewpoint of input of the vibrations, we calculated the propeller-exciting vibratory inputs for some tankers using the model wake distribution of T-2 tanker, and made clear the relation of the moment due to thrust to the overhang moment due to the propeller and the propeller-shaft overhang part. 2) From the viewpoint of output of the vibrations, we carried out some basic experiments on the dynamic characteristics of propeller mounted on a vibrating shaft, and arranged the results in a conventional form for the actual application.
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Saburo YASUI, Hiroshi OKAMOTO
Article type: Article
Pages
22-28
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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This is a report of vibration test for two different types of propellers. The contents may be summarized as follows. 1. Fundamental frequency of bending vibration of propeller A in air was 137.5 c/sec. 2. Difference in fundamental frequency due to material may be ascribable to the difference of E and γ. 3. Fundamental frequency in water was about a half of that in air. 4. Calculating the fundamental frequency of propeller having large expanded area ratio and pitch ratio, it was found to be necessary that fixing position to be located at about 7/8 of the span, instead of the root of blades. 5. Resonant frequency about singing phenomenon was analysed from the hammered sound at the vicinity of trailing edge of blade. This frequency remained constant, regardless of the impact position. 6. Fundamental frequency obtained by analysing the hammered noise well coincided with the result by magnet excitation. 7. It was concluded that obtaining the natural frequency by the analysis of hammered noise was a useful method. 8. It was found that resonance of stress fluctuation due to unequality of wake field to blades was hardly caused.
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Takemitsu TOMI
Article type: Article
Pages
29-40
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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By making use of the conclusion obtained in the 1st report which dealt the susceptibilities of human beings to motions, the present report inquires into the physical interpretation of disturbance of equilibrium function or dizziness of human beings which is caused by a physical stimulus called by vehicle motion, and the physical significance of the substance of motion sickness. In the present report, moreover, description is made concerning the allowable limits of vibration and oscillation in vessels.
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Hiroshi KITAMURA, Toshio HISHIDA
Article type: Article
Pages
41-45
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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It is said that there is a certain case in which the rolling resistance to a supertanker is relatively small compared with that to a cargo ship with C_b greater than about 0.73. The C_b, d/B, KG/B and Rollzahl T_γ√<g/B> etc. of the tanker are different from those of the cargo ship. The experiments and analyses were made to find their effect on rolling resistance. It is found that two of these elements, the KG/B and Rollzahl, have potent influence on the rolling resistance to the full ships.
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[in Japanese]
Article type: Article
Pages
46-54
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
55-57
Published: March 30, 1962
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[in Japanese]
Article type: Article
Pages
58-65
Published: March 30, 1962
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[in Japanese]
Article type: Article
Pages
67-85
Published: March 30, 1962
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Article type: Appendix
Pages
86-87
Published: March 30, 1962
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Article type: Appendix
Pages
App1-
Published: March 30, 1962
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Article type: Appendix
Pages
App2-
Published: March 30, 1962
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Article type: Appendix
Pages
App3-
Published: March 30, 1962
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Article type: Appendix
Pages
App4-
Published: March 30, 1962
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Article type: Appendix
Pages
App5-
Published: March 30, 1962
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Article type: Appendix
Pages
App6-
Published: March 30, 1962
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Article type: Appendix
Pages
App7-
Published: March 30, 1962
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Article type: Appendix
Pages
App8-
Published: March 30, 1962
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Article type: Cover
Pages
Cover3-
Published: March 30, 1962
Released on J-STAGE: February 24, 2018
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