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Article type: Cover
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Published: March 30, 1986
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Article type: Appendix
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Article type: Index
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Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
1-
Published: March 30, 1986
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Masatoshi TAKEUCHI, Minoru ISOGAI, Mitsuo YAMAMOTO, Yozo SHIBATA, Tets ...
Article type: Article
Pages
3-9
Published: March 30, 1986
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The pressure compensated,oil-filled cable system, constructed from cable, receptacle, plug and junction box, has been tested and confirmed in the practicability to work on deep submergence research vehicle and other deep sea equipments at 6000m depth. In the first paper, it was reported that the cables, receptacles and plugs were manufactured for trial and tested successfully as the first step of research and development for the oil-filled cable system. The continual development was carried out for the purpose of estimating the capability of oil-filled cable's total system. Oil-filled cables, connectors-both pressure-proof receptacles and oil-filled plugs-including AWG#16 × 48 multi-contacts type, and oil-filled junction box were individually tested, connected each other and tested in the hydrostatic pressure vessel. The test results including the characteristics in the hydrostatic pressure-max. 938kgf/cm^2- were completely satisfying to confirm the practicability of this system. Besides the test of total system, oil-filled right-angle plug was manufactured for trial and tested successfully at max. 938kgf/cm^2. As a results, it was verified this type of oil-filled plug, especially useful for small vehicles from point of space saving, was equally as useful as straight plug. In this paper, the contents of these trial productions, tests and results of oil-filled cable system and right-angle plug are reported.
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Kimio YOKOTA, Takehiko KUROKAWA, Toshio JITSUMORI, Harumi HIRAKI
Article type: Article
Pages
11-19
Published: March 30, 1986
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Interest in the deep ocean research and development has remarkably increased in recent years. And today 6,000m-class deep submergence research vehicle is coming to be on the drawing board by Japan Marine Science and Technology Center (JAMSTEC) following after SHINKAI 2000. Electric power distribution units are installed outboard the pressure hull by adopting an oil-filled and pressure compensated system in order to make compact in size and weight. In this paper the new electric power distribution system and its switchgears developed for 6,000m-class vehicle is introduced. We experimentally manufactured circuit breakers for short circuit protection, disconnecting switches for inverters, on-off switches for lights and fuses for circuit protection, and carried out various tests, i.e., operation test, interrupting current test, emdurance test, insulating resistance test, in electrical insulating oil under the pressure condition from 0 to 688kgf/cm^2. We have obtained satisfactory results and various kinds of data necessary for the design and manufacture of oil-filled pressure-compensated power distribution units for practical use.
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Yoshiyuki INOUE, Nobuhiro MAKINO
Article type: Article
Pages
21-31
Published: March 30, 1986
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In ship design, CAD and CAM, along with the progress of computers, since 1960's, have been developed in various shipyards. Large or medium computers are mainly used in the systems of shipyards. The recent progress and diffusion of personal computer are conspicuous. Especially, its performance and convenience has great possibilities in the ship design field. In this paper, an attempt was made, to develop the lines of a design ship by l-C_p method, and calculate and draw Hydrostatic, Stability and Longitudinal Strength curves. B-spline curves are used in this system. An attempt to develop a basic ship design system using a personal computer was carried out.
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Yoshitaka HASHIMOTO, Yoshinao KINOSHITA, Shigeyuki OGINO
Article type: Article
Pages
33-40
Published: March 30, 1986
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This paper presents one of estimation method of form factor and wake characteristics, which is based on parameters derived from potential flow calculation. As wake characteristics, following three factors are considered. 1) Bilge vortex center and wake value there 2) Effective wake 3) Wake peak value on centerline Further, an application of this method to design of sterm hull form is described and is shown to be helpful in improvement of stern hull form on propulsive performance and propeller exciting force.
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Yasuo YOSHIMURA
Article type: Article
Pages
41-51
Published: March 30, 1986
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Manoeuvring behaviour significantly changes according to the water depth. It is indispecsable for the examination of the safety in harvour navigation to clarify the characteristics of ship motion in shallow water. After the full-scale trial of Esso Osaka, many kinds of model tests have been performed in deep or shallow water, where the characteristics of hydrodynamic forces acting on hull or rudder have been observed. However, these hydrodynamic data are not sufficient for the prediction of the manoeuvring motion in shallow water, and more theoretical approaches as well as experimental data have been desired. In this report, the predicting techniques are investigated based on the well known MMG's mathematical model. Through the present study, the following conclusions are obtained. 1) MMG's mathematical model is also available for the prediction of the manoeuvring motion in shallow water. 2) Predicted ship motions fairly agree with the observed motions in each water depth. 3) Sinkage and trim in shallow water can be easily predicted by the following simple forms proposed by Tuck and presented here respectively. [numerical formula] [numerical formula] where F_h=U/√<hg>, h:water depth
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Yoshiyuki INOUE, Michihiro KAMEYAMA
Article type: Article
Pages
53-63
Published: March 30, 1986
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Semisubmersible (S.S.) drilling rigs are being constructed for oil exploration in rough seas. Because of S.S. rigs' superiority to ships' dynamic characteristics in waves, the operational safety is improved. Recently, S.S. rigs have been required to work in a wide range of sea states (ice conditions excepted). So, for an optimum design of a S.S. rig, an estimate of the rigs' dynamic characteristics in the various environmental conditions it is supposed to operate in, is necessary. There are various sizes of S.S. rigs, but the relationship of the dimensions to the dynamic characteristics is unknown. Hence, in this paper, the relationship between sizes and characteristics of constructed S.S. rigs was studied and the effect of change in the dimensions on the dynamic characteristics was investigated conducting a series calculation.
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Matao TAKAGI
Article type: Article
Pages
65-70
Published: March 30, 1986
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In the usual incident waves, since we have no fixed free surface, the absolute mean water level in waves cannot be determined. In this paper, by treating the transient waves which do not reach the infinitely far field, the mean water level in regularly sinusoidal part to the undisturbed free surface is determined. In order to confirm the possibility of the present method regular waves in infinite water depth are dealt in the present first report.
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Osamu YAMAMOTO, Akira NISHIGUCHI, Masatoku FUKUDA, Morio INOUE, Kenji ...
Article type: Article
Pages
71-83
Published: March 30, 1986
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Full scale measurements concerning the propulsive performance of 3 ships over a long period of time were carried out using CANSY (Computer Aided Navigation System). The experimenta1 results over both short and long term for the propulsive performance of ships were obtained by analyzing measured data. In order to compare experimental results with predicted results, theoretical calculations were carried out using long term wave frequency, which was obtained from observed data. The full scale measurements were carried out on a bulk carrier (ship A) which runs on the Japan∼Australia route, on a bulk carrier (ship B) and a container ship (ship C) which both run on the Japan∼North America route. According to experimental results, the increase of fuel oil consumption in the long term changes according to sea routes and seasons. By comparing experimental results with predicted results, the following conclusions were obtained. 1) The predicted results of speed loss, power increase and increase of fuel oil consumption in quartering and following seas are a little less than the experimental results, but in head and bow seas are similar qualitatively. 2) The predicted results of frequency distribution of speed loss, power increase and increase of fuel oil consumption are larger than the experimental results in the vicinity of zero, but the overall tend of the predicted results is similar to the experimental results. 3) The predicted results of sea margin in each voyage show the same tendency as do the experimental results, but close agreements are not always obtained. 4) The predicted results of the average ship speed and the increase of fuel oil consumption in each season coincide with experimental results with few exceptions.
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Hiroshi MINEMATSU, Etsuji KAJITA
Article type: Article
Pages
85-92
Published: March 30, 1986
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Floating marine structures have emploied a slack mooring system. In deep waters, this system needs a wide mooring area and motions of the floating body are larger than those in shallow waters. A taut mooring system has appeared to solve these disadvantages in deep waters. The tension leg platform (TLP) employing the taut mooring system has some advantages that heaving motions are very small and the mooring area needs not to be so wide. But in using a TLP, some peculiar phenomena are observed. One of the serious problems is the unstable motions arised from sub-harmonic resonance of swaying motions in low frequency zone. Other is the springing phenomenon in the mooring system due to super-harmonic resonance of heaving motions in high frequency zone. Vertical wave exciting forces are closely related with these phenomena. When the vertical wave exciting forces are small at these resonance frequencies, the unstable motions and the springing phenomenon will be reduced. In this report, a new wave-free column whose vertical wave exciting force vanishes in low and high frequency zones, is applied for the TLP. It is shown that the unstatable motions and the springing phenomenon are reduced in both theoretical and experimental investigations.
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Kimio SAITO, Tsukasa KYOE, Matao TAKAGI
Article type: Article
Pages
93-102
Published: March 30, 1986
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When the period of grouped waves lies in the vicinity of the natural frequency of a moored body, it can be expected to occur large slow drift oscillations of the body. In this paper, the wave groupiness and its effect on the slow drift oscillations of a moored body are discussed. Several wave generation techniques which allow to control of the formation of grouped waves in the experimental tank are investigated and the slow drift oscillations of a moored body are measured in those waves. It seems through this study that the wave groupiness is to be taken into account for determining the maximum values of the slow drift oscillations of a moored body.
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[in Japanese]
Article type: Article
Pages
103-116
Published: March 30, 1986
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[in Japanese], [in Japanese]
Article type: Article
Pages
117-120
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
121-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
121-122
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
122-123
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
123-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
123-124
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
124-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
124-125
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
125-126
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
126-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
126-127
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
127-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
127-128
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
128-129
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
129-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
129-130
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
130-
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
130-131
Published: March 30, 1986
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[in Japanese]
Article type: Article
Pages
131-135
Published: March 30, 1986
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Article type: Appendix
Pages
137-
Published: March 30, 1986
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Article type: Appendix
Pages
139-145
Published: March 30, 1986
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Article type: Appendix
Pages
App2-
Published: March 30, 1986
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Article type: Appendix
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App3-
Published: March 30, 1986
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Article type: Appendix
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App4-
Published: March 30, 1986
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Article type: Appendix
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App5-
Published: March 30, 1986
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Article type: Appendix
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App6-
Published: March 30, 1986
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Article type: Appendix
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App7-
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Article type: Appendix
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Published: March 30, 1986
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Article type: Cover
Pages
Cover2-
Published: March 30, 1986
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Article type: Cover
Pages
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Published: March 30, 1986
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