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Article type: Cover
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Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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Hideo TANAKA, Kazuhiko WATANABE
Article type: Article
Pages
1-11
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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In recent years, owners and operators of T-2 tankers have encountered difficulties in maintaining and operating them, because these vessels are old, having been launched from 12 to 16 years ago. The steel structures of their cargo-carrying section are so heavily corroded as to need internal renewal. Jumboizing is considered to solve these problems, in that it extends the useful life of the vessel and saves a vast expense for maintenance. This conversion involves a complete renewal of the cargo-carrying section of the ship, the new tank section being much longer and of greater breadth than the originals, in order to increase the deadweight. The Jumboizing of a T-2 oil tanker was carried out in the Kobe Shipyard & Engine Works of the Company on the order of Messrs. Calendar Navigation Corporation. The vessel, the S.S. "Marchcal" was completed and delivered in September, 1958, and this article gives an outline of the jumboizing process conducted.
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Kazuo TERAZAWA, Yukio UEDA
Article type: Article
Pages
12-18
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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Corrugated plates have recently come to be applied to some parts of ship structure, especially to superstructure, instead of stiffened flat plates, with contem plation of reducing the weight of structure and labour of removing welding distortion of plates. This report consists of the experimental studies on the strength and stiffness of corrugated plates, generally called "Trench Sheet", and the comparison with stiffened flat plates concerning to tensile and shearing forces, and bending moments.
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Seiichiro NISHIJIMA, Kazuo ICHIKAWA, Takehiko KIHARA
Article type: Article
Pages
19-26
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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Hitachi Shipbuilding & Engineering Co. Ltd. has been building uniflow type diesel engines under license of Burmeister & Wain, Denmark, since 1950, and also completed, in 1955, the first Alpha type diesel engine and controllable pitch propeller in Japan, for which B & W has years' experience in manufacturing. In this Paper, the outline of the construction, feature and operation of the Alpha engine and propeller are illustrated, and then the result of sea trial of the fishing boat "SHONAN MARU" equipped with Alpha 405 VO type engine and controllable pitch propeller is described.
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Ken'ichi HIRABAYASHI
Article type: Article
Pages
27-33
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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In the design of diesel cargo ship, the load of winches has great influence on the decision of auxiliary boiler and main generator capacity. In this paper, the author explains a theoretical calculation method by figure on the load factor of winch. Some important points in this method are as follows. This load factor is f = (W_S)/(W_R), where f = Load factor of winch, W_S = Demanded steam or electric power consumption of all winches at service condition, and W_R = Rated steam or electric power consumption of all winches at full load condition. For calculation of the theoretical load factor, the author assumes the following. 1. Cargo handling method is "Burtoning method" or "Swinging derrick method." 2. When using two winches for one gang, each winch is not to be driven in full power at the same time. 3. The operating factor is indicated by the equation L = (0.5n+2) / n, where L = Operating factor, and n = Number of winches. 4. Cargo weight and hook speed are assumed by Fig's 5 and, 6 which are plotted by operating results. 5. Partial load efficiency of winch is assumed as Fig. 7. With these assumptions, Fig. 10 "Calculation figure of standard load factor" is drawn.
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Seiichiro NISHIJIMA, Masao HATA
Article type: Article
Pages
34-36
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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When planning the machinery parts of oil tankers, estimation of steam consumption for heating cargo oil and maintaining its temperature is a important matter. Especially on motor tankers, capacity of auxiliary boiler is determined by this consideration. No general figures have, however, been given in this connection hitherto. This report deals with this subject.
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Yoshikazu MATSUURA
Article type: Article
Pages
37-42
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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It is well known that in studying the natural frequencies of flexural vibration of ships, especially in the higher modes of vibration, the effect of shear deflection of a ship on the natural frequency should be considered. This effect will be of considerable importance in the study of the higher modes of vibration when the hull girder is subdivided by nodal sections into comparatively short portions. The object of this paper is to investigate the nature of the effect of shear deflection on the natural frequency, for brevity, in the case of a free-free bar of uniform cross section. The approximate solution of the equation of motion of a vibrating bar, in which the correction for shear was introduced, was obtained by the use of the Galerkin's method. The frequency equation obtained in this manner is represented in the form of simultaneous equation, the solution of which can be obtained with sufficient accuracy by much less labour in comparison with the case when the natural frequency is obtained from the frequency equation which is derived from the exact solution of the fundamental equation.
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[in Japanese]
Article type: Article
Pages
43-44
Published: June 30, 1959
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
45-46
Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Appendix
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Published: June 30, 1959
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Article type: Cover
Pages
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Published: June 30, 1959
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