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Published: September 30, 1987
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Article type: Index
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Article type: Appendix
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Article type: Appendix
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1-4
Published: September 30, 1987
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Article type: Appendix
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Article type: Appendix
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6-7
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Article type: Appendix
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Article type: Appendix
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8-9
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Article type: Appendix
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Published: September 30, 1987
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[in Japanese]
Article type: Article
Pages
11-27
Published: September 30, 1987
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Shohei YOSHIDA, Naoki YAMANAKA, Ryoichi OHMINAMI, Hideo ONO, Hiroshi Y ...
Article type: Article
Pages
29-37
Published: September 30, 1987
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In the past, large concrete offshore structures were all constructed in one united body in a large graving dock. However, this method takes long time and costs much is building the dock itself. By contrast, use of an existing shipbuilding dock, which is fully equipped, makes the production of concrete offshore structure easy in time and cost. But, because of the narrow breadth, such a shipbuilding dock cannot allow a large concrete offshore structure to be constructed in one united body. To overcome this demerit, we have developed a jointing method of concrete offshore structures afloat which have been built in two or more sections in an existing shipbuilding dock. This method is such that floating concrete structures are pulled and joined and the joint part is filled with concrete. We have studied a procedure to ensure a safe and accurate joint, developed/designed jointing fittings and a watertight rubber, and designed a joint part with sufficient strength providing good watertightness. In deciding such a joint part, we have carried out experiments of curing concrete under cyclic load, which simulates wave-induced load, and also calculations by FEM analysis to confirm good watertightness of the concrete.
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Shoichiro TSUGAKI, Nobuyuki ABE, Ichiro TANAKA
Article type: Article
Pages
39-47
Published: September 30, 1987
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The recent offshore exploration drilling has been made in deeper sea and in higher latitude where the environmental conditions are much severer. This has given rise to such problems as the decrease in drilling efficiency and the increase in the workers' danger. In these conditions, there is an increasing tendency to adoption of various automated systems which will be helpful to improve the drilling efficiency and the drilling safety. From this point of view, the authors are developing an automatcd pipe handling system of a new concept. This paper introduces this new concept of the automated pipe handling system, together with the test results of a half size partial model of this system.
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Noriyuki TAKASUGI, Takuya TANIUCHI, Yohzoh SHIBATA, Masanori OHKUBO, T ...
Article type: Article
Pages
49-64
Published: September 30, 1987
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ROV (Remotely Operated Vehicle) for sea-bottom survey or underwater work is rapidly in widespread use. ROV is increasingly required to operate in deeper water, and have multiple functions. It is available in two types, tethered and non-tethered. Since the tethered type is expected to be the "main current" for ROV, it is necessary to develop a tether cable for deep sea ROV which is capable of signal and power transmission, excellent mechanical strength, lightweight, and small-sized. Imagining a transmission system for deep sea ROV, we made experimentally several types of tether cable using optical fiber, high voltage power conductor, and tension member, and also optical and power connectors for such cables. They were tested to evaluate their electrical and mechanical properties under a hydraulic pressure of up to 1,200Kg/cm^2G. As a result we succeeded in making a prototype cable and connectors which meet the target requirements. The success confirms our conviction that practical application of tether cable and connectors for deep sea ROV operating 10,000m depth is quite possible The techniques acquired will be usable not only for deep sea ROV but also in a broad area of ocean engineering.
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Shinsuke AKAGI, Kikuo FUJITA
Article type: Article
Pages
65-75
Published: September 30, 1987
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An expert system for the basic design of ships is developed. The design process is understood as determining the design parameters and the relationships among them. The relationships among the design knowledges are represented by a network model. The object-oriented knowledge representations are introduced in the computer system to handle the design parameters such as the principal particulars of a ship in the network model. The expert system build with the above concept provides the following functions: (1) Flexible model building and easy modification. (2) Effective diagnosis of the design process by using rule-based knowledge representations. (3) Hybrid function with both numerical computations and symbolic treatments of the design knowledge by coupling the systems programmed with LISP and FORTRAN languages. Finally the system is ascertained its validity and effectiveness by applying to the basic design of a bulkcarrier ship.
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Akinori YUMURO
Article type: Article
Pages
77-89
Published: September 30, 1987
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Regarding the method to predict maneuvering derivatives in shallow water, Inoue's method, which is based on Bollay's wing theory, is available as one of the representative methods. Previously, the author improved Inoue's method by taking account of shallow water effect on trailing vortices inclination. In the improved method, vortices strength and inclination angles are determined by solving the integral equation through iterative procedure. Under the condition of finite water depth, some experiments on hydrodynamic forces due to drifting motions were conducted, employing series models with a change of the length-breadth ratio. Further, observation of trailing vortices inclination at finite depth was made by means of the dye tracer method. From these experiments concerning a flat plate model included in this series, it is clarified that the improved method gives good agreement with experimental results for hydrodynamic forces in shallow water and the ratio of inclination angle in shallow water to that in deep water. On the basis of the improved method, the author proposes a method to predict ship breadth effect on the ratio of derivatives in shallow water and in deep water. To express the thickness effect, the sources are distributed over the lifting surface of infinite images with respect to free surface and the water bottom. The source-distribution method gives almost the same tendency as experimental results for the derivatives ratio to increase with decrement of the length-breadth ratio.
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Huai-Xin CHANG, Yoji HIMENO
Article type: Article
Pages
91-98
Published: September 30, 1987
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The present paper describes a procedure for evaluating three components of unsteady velocity in periodic flow through a measurement using five-hole Pitot tube. The frequency response of the whole pressure measurement system is examined in regular head wave. Using this result the velocity distribution in a stern section of a ship model in forced pitching motion is measured by use of the five-hole Pitot tube. It is found that the time-mean velocity in pitching motion is larger than that in still water near the propeller position and in this region the bilge vortices become smaller.
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Takeo OHISHI, Yoji HIMENO
Article type: Article
Pages
99-107
Published: September 30, 1987
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In this paper a method of automatic grid generation is proposed for the computation of the fluid flow around ship hull and applied to actual ship forms. The offset data, and stern and bow profile data are prescribed as initial. An exponential spline function is used for expressing ship hull form. The external grid system is created by combining successively nonorthogonal grids in the transverse sections. They are generated by geometric requirements into account, such as clustering, orthogonality, smoothness, and minimum spacing. The present method will be a useful tool for the computation of ship viscous flow
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Tetsuya YAO
Article type: Article
Pages
109-115
Published: September 30, 1987
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A formulation is performed to analyze buckling strength of a rectangular plate with shear lag stress distributions in two perpendicular directions. In the formulation, shear lag stress distribution is approximated by parabola, and a simply supported condition is supposed along all edges for buckling deflection. For a simple case of uniform shear lag stress distribution, the buckling strength is obtained in a closed form. Some example calculations are carried out to demonstrate the buckling characteristics of a rectangular plate with shear lag stress distribution. As a practical case, the inner bottom plate of a ship's hull is analyzed assuming uniform stress and shear lag stress in the longitudinal and the transverse directions, respectively, and the influence of shear lag stress on the buckling strength is discussed.
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[in Japanese]
Article type: Article
Pages
117-130
Published: September 30, 1987
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[in Japanese]
Article type: Article
Pages
131-137
Published: September 30, 1987
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[in Japanese]
Article type: Article
Pages
139-144
Published: September 30, 1987
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Article type: Appendix
Pages
145-146
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Article type: Appendix
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147-
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Article type: Appendix
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Article type: Appendix
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Article type: Appendix
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Article type: Appendix
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Article type: Appendix
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Article type: Cover
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