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Article type: Cover
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Published: June 30, 1976
Released on J-STAGE: March 30, 2018
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Article type: Cover
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Cover2-
Published: June 30, 1976
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Article type: Appendix
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App1-
Published: June 30, 1976
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Shinzaburo TAKEDA, Masayoshi KONDO, Teruo SUZUKI, Masahisa IMAGIIRE
Article type: Article
Pages
1-7
Published: June 30, 1976
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This paper is to report on a computer aided system for scheduling of shipbuilding work. This system covers a calculation of manpower allocation and an adjustment of shipbuilding schedule at very beginning stage of shipbuilding. The system is to control the scheduling in the manner of on-line conversation through character display between man and computer.
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Takao HIRAYAMA
Article type: Article
Pages
9-16
Published: June 30, 1976
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Simulation technique is applied for crews' movement in the mess room of escort destroyers using Monte Carlo analysis. It is found that above simulation can express movement model well, and some of the simulated results are shown. Quantative design method is described for a system where human movement is a primary factor.
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Koichi TAKEUCHI, Hiroshi SUNAHARA, Takayuki SAWAMURA
Article type: Article
Pages
17-24
Published: June 30, 1976
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Recent trend of increasing size of ships has brought about many newly designed shipbuilding or repair docks in Japan. While, on the other hand, conventional docks have had instances of accommodating comparably large sized ships to the maximum possibe extent. This report relates to one of the latter examples. In docking and undocking 80,000 L.T.D.W. tankers with extreme breadth of 34.45 m through 34.69 m gate, special device called "connection arm " has been developed. A pair of the rigid connection arm is temporarliy installed between ship's side shell and guide rail on dock side with carriages running on it, thus keeping the gap between ship and dock side wall constant. The device has been used eight times with successful results.
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Yoshifumi TAKAISHI, Toshihiko SARUTA
Article type: Article
Pages
25-32
Published: June 30, 1976
Released on J-STAGE: March 30, 2018
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An auto-pilot affects the ship motions either of an actual ship in the oceans or of the model ship in the experimental tanks. Especially for a high-speed container ship the rolling motions induced by the auto-pilot steering should not be ignored, because the rudder forces are large enough to heel herself owing to her high-speed and relatively small GM value. The rudder movements can be treated as the seventh degree of freedom of ship motions in waves which couples with the other motions. The authors have described the equations of motions about rolling, yawing and swaying motions including the rudder forces which are induced by the periodic movements of the rudder of the auto-pilot. The model experiments in the oblique regular and irregular waves as well as the sine steering experiments in the still water have been carried out and the experimental results have been compared with the theoretical values. It is concluded that; a) Rolling motions by sine steering in still water can be calculated with a sufficient accuracy by the strip theory, b) The effects of auto-pilot should be taken into account to calculate the lateral ship motions as rolling, yawing and swaying motions in regular oblique waves, especially in the quartering waves, and c) The auto-pilot gives a ship the restoring moment of yawing motion which induces the synchronous yawing motions with very low frequencies in irregular waves.
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Shigeru YAMAMOTO
Article type: Article
Pages
33-39
Published: June 30, 1976
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This paper deals with two-dimensional flow problem from the view point of ship manoeuvrability by applying the Finite Element Method. It is shown how to calculate horizontal two-dimensional potential flow including quasi-stationary circulation, and how to obtain hydrodynamical forces on arbitary shaped ships moving in an arbitary shaped channel. The interaction forces between two same ships in a parallel-walled watercourse are numerically computed as an example. In order to discuss the propriety of horizontal two-dimensional approximation, the experimental data are compared with the calculated forces of a ship in a restricted water, and the correction coefficients for the added mass, the added mass moment of inertia, bank suction, etc. are obtained.
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Yoshiho IKEDA, Yoji HIMENO, Norio TANAKA
Article type: Article
Pages
41-49
Published: June 30, 1976
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The authors present a method for calculating frictional roll damping force using three-dimentional unsteady turbulent boundary layer theory. The results of the calculation show fairly good agreement with experiments and also with the Kato-Tamiya's formula. Furthermore, a formula for roll damping due to the normal force of bilge keels is proposed on the basis of the recent studies on the drag coefficient of oscillating bluff bodies. It is found that the drag coefficient of the normal force of bilge keels depends only on the roll amplitude, or so called period parameter, and that the nomal force causes not only a non-linear roll damping but also a linear one. And the effect of advance speed on the normal force of bilge keels seems to be very small.
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Tetsuo TAKAHEI, Shoichi NISHIKAWA, Shozo NAKAGAWA
Article type: Article
Pages
51-58
Published: June 30, 1976
Released on J-STAGE: March 30, 2018
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Recently the doppler sonar speed log has become quite popular for VLCCs built at the Sakaide Works of Kawasaki Heavy Industries, Ltd. However, during their speed trials we occasionally noticed the false readings with the doppler sonar speed log at some speeds, particularly when they are gathering way in the ballast condition. This phenomenon seems to have been caused by the air bubbles contained in the sea water running along the bottom of the ship. The same bubbles can be traced back to the broken waves in front of the bow. This has been veryfied by the streamline tracing by the computer and also by colored liquid drops on a model in the circulating water channel.
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Shoichi NAKAMURA, Kimio SAITO, Isamu MIYAZAKI, Yoshio ISOZAKI
Article type: Article
Pages
59-75
Published: June 30, 1976
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In order to study the hydrodynamic impact pressure acting on ship's hull bottom forward in waves, the following three kinds of model experiments have been carried out with a ship model of ore carrier. (1) Measurement of the hydrodynamic impact pressure in drop tests onto the calm water. (2) Measurement of the hydrodynamic impact pressure in regular head waves. (3) Measurement of the hydrodynamic impact pressure in irregular head waves. Using the values of the coefficient of impact pressure obtained by the drop tests and the ship motions in waves, the hydrodynamic impact pressure acting on forward bottom in waves is estimated. In this report not only the validity of the calculation method but also the frequency of slamming in irregular waves are discussed.
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Tetsuro IKEBUCHI
Article type: Article
Pages
77-87
Published: June 30, 1976
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In shallow water, hydrodynamic forces and moments acting on the rigid body among waves become different from those in deep water. In this paper, firstly two-dimensional linear radiation problem is solved using Green's function [I] of finite water depth and then hydrodynamic quantities such as added mass, added moment of inertia and damping coefficients of the rigid body are calculated. Secondly, the forced swaying test using the two-dimentional model is carried out to confirm the validity of the above calculation method. As the result of the test, this method is confirmed to be valid in the linear theory. Lastly, as an application of the above method, ship motions among rugular waves in shallow water are predicted by strip method.
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Seikoo OGIWARA
Article type: Article
Pages
89-98
Published: June 30, 1976
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Newman-Sharma's wave analysis method is one of the most rational and practical method for its mathematical explicitness and simplicity of experiment. However, the accuracy of wave measurement and analysis sometimes becomes an issue when it is applied to separation of resistance components, hull form design and so forth. In this paper, in order to investigate the basic problems of Newman-Sharma's method, the author presents the results of extensive experiments with INUID ship model, which was made in two tanks of IHI Ship Model Basin, the towing tank and the seakeeping & maneuvering tank which has a wide area of water surface. Main object of these experimental investigations was to cast light upon the indistinct influences that are ordinarily hidden in the procedure of wave analysis by applying more refined measurements. Then, the focus was brought on the following matters, a) the length of approach run of a model and the growth of ship waves, b) the effects of truncation for finite wave records, c) the effects of lateral position of longitndinal-cut, d) reflexibility of ship waves on the tank wall. It is hoped that the various results of these investigations will contribute not only to wave analysis problems but also to future development of wave resistance theory.
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Junkichi YAGI, Yoichi HATTORI
Article type: Article
Pages
99-108
Published: June 30, 1976
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When a vessel is going among oblique waves, unsymmetrical loads are imposed on the vessel. Such loads cause racking of the hull. Especially for vessels with small number of transverse bulkheads like car carriers, this phenomenon is remarkable. In this paper authors carried out a calculation of structural response of a box girder under asymmetrical load to reveal the whole feature of racking phenomenon. To meet this purpose simplified calculation model was adopted and the effects of transverse bulkheads and transverse rings on the prevention of racking are clarified.
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Junkichi YAGI, Yasumitsu TOMITA, Akira NAKAMOTO
Article type: Article
Pages
109-117
Published: June 30, 1976
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It is assumed that fatigue strength of steel under various cyclic loading is only affected by strain distribution, namely, cyclic plastic strain range, cyclic creep rate, ratio of longitudinal to transverse strain and strain concentration factor and does not depend on type of loading. The formulae proposed by the authors for cumulative fatigue damage law under ordinary cyclic load was applied to fatigue crack initiation life of mild steel plate under axial cyclic impact load, and it was found that the validity of the formulae for estimation of the fatigue life of cyclic impact loading was verified.
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Takeshi NAGANO, Hiroshi HIRAI, Hisayoshi YASHIMA, Shinji KUMAZAKI, Har ...
Article type: Article
Pages
119-131
Published: June 30, 1976
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The structural members of the after peak tank are susceptibly vibrated by the exciting force of the propeller because they are placed nearby the propeller. Some ship has suffered fractures on the tank structure due to vibration. Although many investigations have hitherto been conducted on the vibration of stiffened panels through experiments and analyses, there can be found very few data concerning the vibration of the after peak tank of actual ships. This report deals with the actual vibration behavior of the after peak tank structure of some ship. At the vibration exciting and the running tests, measurements of vibration and dynamical stress were carried out on a stiffened and locally perforated floor plate both in water and in air. As a result of the measurements and analyses, the following was clarified. 1. Natural Trequency of a stiffened panel can be obtained accurately by using simplified calculation. 2. Calculated mode of vibration and stress are in comparatively good agreement with those measured by experiments.
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[in Japanese], [in Japanese]
Article type: Article
Pages
133-139
Published: June 30, 1976
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Article type: Appendix
Pages
141-143
Published: June 30, 1976
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Article type: Appendix
Pages
App2-
Published: June 30, 1976
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Article type: Appendix
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App3-
Published: June 30, 1976
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Article type: Appendix
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App4-
Published: June 30, 1976
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Article type: Appendix
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Published: June 30, 1976
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Article type: Cover
Pages
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Published: June 30, 1976
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