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Article type: Cover
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Cover1-
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Published: December 20, 1958
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Hideo SASAJIMA, Eiichi YOSHIDA
Article type: Article
Pages
1-5
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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In the previeus paper (in the Jour. of the Soc. of Nav.Arch. of Japan, No.130), the authors investigated the form effect on the skin friction and showed that (1) the form effect does not follow the Froude law and reaches to a considerable amount in the case of full ships, and (2) this effect can be roughly estimated from symmetrical aerofoil tests and thus it may be fit in practice or the estimation of powering at the initial design stage. The present paper gives a set of charts of the resistance for supertankers. These are obtained from the skin friction by the Schoenherr value, the roughness allowance as 0.0003, the form effect by the previous estimation and the wave-making resistance, not the so-called residual resistance, by the Taylor charts. The application for several tankers showed a good coincidence with their trial results within about ±5% error. The variation of the principal particulars is obtained under a condition of constant resistance, displacement, speed, draft and longitudinal C.B., from which it may be infered that the supertankers in future had better trend towards the ship form of small L/B rather than that of large σp.
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Kenichi HIRABAYASHI
Article type: Article
Pages
6-13
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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The first geared diesel ship with electric slip couplings in Japan was Completed in May 1956 at Kawasaki Dockyard Co., Ltd. We have performed the maneuvering chararacteristic tests and have investigated the results of navigation on the ships of this type. In this paper, the author explains the maneuvering characteristics of the geared diesel ship with electric slip couplings based on these investigation and results of trials.
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Seikan ISHIGAI, Kotohiko SEKOGUCHI
Article type: Article
Pages
14-18
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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The electric power consumption in a cargo ship with 5,600 SHP turbine was measured in, her one round trip including the departure, voyage, entry, unloading, and anchorage. From the results of the measurement the variation of the total electric power consumption due to the change of ship condition, the apparent load factor for the individual auxiliary machine, and the overall load factor for the total of the intermittently used auxiliary machines are discussd in this paper. The principal terms of the cargo ship are tabulated in Table 1. In ship design, the necessary capacity of generators is selected by making use of either the apparent load factor for the individual auxiliary machines or the overall load factor for total auxiliary machines in intermittent service. These load factors can in turn be measured by the performance of the ship thus designed. In Table 5 the measured load factors are compared with the load factors as given by the standard published by the Kansai Society of Naval Architects. It can be concluded that the standard load factors are generally in good agreement with the measured values.
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Hiroshi OHASHI
Article type: Article
Pages
19-22
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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An experiment is carried out on the characteristics of a reversible volute pump. The pump is possible to discharge to one definite side independently of rotating direction of impeller. The capacity, total head, and number of revolution of the test pump are respectively 15 (m^3)/h, 12.5m and 1,320rpm. The results of experiment are shown on Tables 1 and 2. It is shown that if it is allowed to lower a little the efficiency at normal running, we can expect pretty capacity at reverse running.
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Rinichi WASHIMI
Article type: Article
Pages
23-26
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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In the design of a screw propeller, the thickness of blade is determined to have sufficient strength in accordance with stress calculation. Nevertheless, blade fracture rarely happens from various causes, and some are considered from fatigue failure. The investigation on fracture-section of these propellers reveals that the fatigue starts at a different point from the point of maximum stress calculated by conventional method. Therefore, the author has calculated, for a typical propeller, the radial distribution of stress of blade section and the distribution over a section of a given radius more reasonably than conventional method. The result is that the point of maximum stress calculated by the author's method is nearer to the starting point of fatigue, not coinciding with the point of maximum stress calculated by conventional method.
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Kazuwo ITO
Article type: Article
Pages
27-31
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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Although the methods of setting up the limit of cavitation of marine propellers have been introduced by various authors, it seems that the most eligible method may be the one introduced by Mr.Y.Nakajima utilizing the Schoenherr's pressure drop diagram of aerofoils reduced from Gutsche's wind tunnel experiments. In this process, Mr.Nakajima ingeniously made out the lift coefficient ζ_a by geometrical calculation, but his method appears to be rather difficult for unskilled designers to understand and somewhat complicated in calculation. In this connection the author tried and succeeded in obtaining the value of ζ_a very simply from propeller thrust and applied it to estimate the cavitation criterion. By this new method it is suggested that we can rather easily find the most convenient camber ratio of blade section at 0.9 Rand furthermore it may be emphasized that it allows us the capability of immediately obtaining the cavitation characteristics of blade section at any position such as 0.7R or 0.8R.
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Tomoyuki HIROWATARI
Article type: Article
Pages
32-38
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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An analysis was made on the character of a forced oscillation of a linear vibration system excited by force with periodically altering amplitude and frequency. The results are as follows. (1) The frequency of this type of forced oscillation is always equal to the natural frequency of the vibration system, even if the mean frequency of the exciting force is not equal to it. (2) In the ordinary linear vibration, the maximum value of magnification factor exists on the resonant frequency, but in this type of forced oscillation it is situated at an frequency lower than resonance. (3) The maximum value of magnification factor of this forced oscillation is equal to 50∼60 per cent of the linear vibration. This theory was applied to the vibration of steel stack induced by the wind, and the results were shown in the paper.
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[in Japanese]
Article type: Article
Pages
39-41
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
42-
Published: December 20, 1958
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Article type: Appendix
Pages
43-
Published: December 20, 1958
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Article type: Appendix
Pages
App1-
Published: December 20, 1958
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Article type: Appendix
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Published: December 20, 1958
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Article type: Appendix
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Published: December 20, 1958
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Article type: Appendix
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Published: December 20, 1958
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Article type: Appendix
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App5-
Published: December 20, 1958
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Article type: Appendix
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Published: December 20, 1958
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Article type: Appendix
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Published: December 20, 1958
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Article type: Appendix
Pages
App8-
Published: December 20, 1958
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Article type: Cover
Pages
Cover3-
Published: December 20, 1958
Released on J-STAGE: February 24, 2018
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