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Article type: Index
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Article type: Appendix
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1-4
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7-8
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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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19-20
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Article type: Appendix
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21-22
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Article type: Appendix
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Article type: Appendix
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25-28
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[in Japanese]
Article type: Article
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29-36
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[in Japanese]
Article type: Article
Pages
37-68
Published: September 30, 1982
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Yasutaka AMITANI, Toshio MAEDA, Hirokazu HAYAKASHI, Yoshimitsu YAMAMOT ...
Article type: Article
Pages
69-76
Published: September 30, 1982
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The simulator for Deep Submergence "SHINKAI2000" was constructed by Mitsubishi Heavy Industries LTD. Kobe Shipyard & Engine Works and was delivered to Japan Marine Science and Technology Center in March l982. Function of this system is to simulate the submersible operation from descent to ascent including miscellaneous operations on the sea bottom and the purposes are to train operators and observers and to evaluate their operations. Following simulation are possible; motion of submersible, operation of equipment, visual field of the sea bottom, sonar display, acoustic noise inside the hull, environment inside the hull and submersible casualties. The system consists of pressure hull, attitude controller, sea bottom model, TV camera set and projectors, instructor console, computors, etc. Motion simulation of submersible includes descent/ascent motion and three-dimensional motion with propulsion system or weight-trim control system. This motion simulation is divided roughly into four parts, i.e. set of three-dimensional motion equations, external environment, motion characteristic change accompanying with depth change and equipment performance. Bottom suction force after bottomming and "Entanglement" are simulated by means of another set of equations. These equations were checked and showed good coincidence with real ship data. As evaluation system, training conditions and operation check-lists are displayed on each color CRT of the instructor console and operation procedures are typed out. Training data stored on magnetic disc can be played back by off-line procedure.
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Kimiaki KUDO, Michio NAKATO
Article type: Article
Pages
77-85
Published: September 30, 1982
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Investigating the characteristics of the wave-induced steady turning moment on the fishing boat in oblique seas, model tests are conducted and analysed. On the other hand the results are compared with those of the calculation which is based on the uni-fied theory and approximated by neglecting a part of the diffraction effect. The fishing boat in oblique seas is exerted by the steady turning moment so as to make it parallel to the wave crest line generally in the frequency range used in the experiments. However, it should be noted that in shorter waves it is not the case and the direction may be reversed. The approximate calculation is found not to agree well with experiment. This is mainly due to the overestimate of the lateral drifting force. In order to estimate correctly the steady force and moment, the diffraction effect must be totally included.
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Jun OBOKATA, Norio SASAKI
Article type: Article
Pages
87-93
Published: September 30, 1982
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In the single point mooring (SPM) probrem of a tanker, it is wellknown that slow oscillations have a large influence on the mooring load. About the slow oscillation, theoretical and experimental studies have been actively practiced in order to estimate allowable enviromental conditions and the design criteria of mooring equipments for the design of SPM system. However, SPM has been used mainly for mooring tankers, therefore, the relation between ship form and the slow oscillation does not seem to have been taken account. In this paper, authors examined the effect of ship form on the slow oscillation by two kinds of theoretical approaches, that is, time domain analysis and dynamic stability analysis, and showed that ships with large B/d are more stable for the slow oscillation. And fins like fish gills fitted on the bow part of a tanker are also confirmed to have much effect to reduce the oscillation. These fins can be considered to be a practical way to reduce the oscillation when a tanker is used as a storage tank. As for the external forces in SPM probrem of a tanker, it has been said that current force is most effective to the slow oscillation comparing with wind and wave drift forces. therefore, only current is considered in this paper.
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Hitoshi HOTTA, Keiichi SATO, Takuma HASHIMOTO
Article type: Article
Pages
95-106
Published: September 30, 1982
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This paper is foundamental study about motion and mooring force of floating ocean structure moored by dolphin system in regular waves. Such a dolphin system has rubber fender whose stress-strain property is non-linear, that is hysteresis property. We introduced to calculation of motion and reaction force of fender such non-linerity and effect of absorbed energy by fender, and compared with results of experiments by model test. The results were that, the calculation of frequency response value used by reaction force approximated by polynomial function without effect of absorbed energy is enough effective in regard to design of mooring system. And we can simulated more correctly by calculation of time history, used by impulse response method.
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Yoshiyuki INOUE, Hideo KANEKO, Tomoaki IYOKU, Fumio TAKEI
Article type: Article
Pages
107-119
Published: September 30, 1982
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Of late a lot of emphasis has been given to the design study of very large offshore structures e.g. floating air port, floating oil storage tanks moored with dolphin. But there have been very few studies on the motions and mooring forces of vessels moored with dolphin in waves and specially in case of earthquake. In this paper, the motions and mooring forces of vessels moored with dolphin are investigated experimentally and theoretically. At first, model tests were conducted in regular waves with 2 types of mooring restoring forces having nonlinear characteristics. Also experiments were performed under simulated earthquake motions with linear mooring restoring forces. Theoretical analyses were carried out with the help of two methods, namely, equivalent linealized approximate method in frequency domain and computer simulation in time domain (Runge-Kutta-Gill method). The experimental results were in good agreement with the theoretical analysis based on equivalent linealized approximate method as well as computer simulation in time domain by Runge-Kutta-Gill method. In case of vessels moored in waves, influences on the motions and the mooring forces of the wave height, steady external forces, the characteristics of mooring restoring forces and reflected waves by a berth were discussed on the basis of the results of tank tests and theoretical analyses. Experiments and theoretical analyses were also carried under simulated earthquake conditions. The mathematical model adopted for this theoretical analysis leads to a good agreement between the theoretical and experimental results. It was also found that to withstand forces due to earthquake, the mooring systems of main structures should be designed to have a sufficiently low natural frequency of oscilation with respect to that of seismic motion.
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Kimiaki KUDO, Yoshinobu KITANO
Article type: Article
Pages
121-132
Published: September 30, 1982
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This paper presents the basic design procedure of the wave power absorber utilizing the anti-pitching tank (A.P.T.). The A.P.T. is carried on the ship and converts the wave energy to the tank water oscillation. It is further imagined to absorb the energy through the air turbine and the generator. The optimum conditions of maximizing the absorbed wave power are following: (1) the resonant periods of tank and ship should be equal to the design period of the incident waves, (2) the damping added to the tank should be adjusted so that the absorbed power is equal to the radiating power due to the pitching of ship. The design procedure is assured through the model tests. It is however found that the A.P.T. should contain the significant mass of water relative to total displacement of ship and its horizontal part should be long enough, and that the ship should be designed to have a long pitching-period on securing of stability. The flat tank and the shallow draft ship with elliptical plan form are designed and the wave power absorbing characteristics are analysed. It shows a good performance and is expected to be feasible. Additionally, in this type of wave power absorber the mooring force is relatively small and the working fluid is closed in the tank so that the maintenance is rather free than the conventional O.W.C. devices.
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Shoichi HARA, Michiaki IGAI, Sadahiro NAMIE
Article type: Article
Pages
133-138
Published: September 30, 1982
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A Curtain of air bubbles ejected from a pipe submerged in water may produce a rising flow of the water, which spreads into a horizontal flow at the water surface. Many researches about the breaking water using the horinzontal flow as a barrier were made so far. G.I. Taylor demonstrated theoretically that the surface flow from the adverse direction against waves can prevent the waves from progressing. H.E. Kobus and T.J. McDougal made analytical studies on the vertical rising flow including experimental constants. However, from the view point of the technology of air curtain such as the application to the oil fence, there may be few investigations on the behavior of the plume in the tidal current. The authors have made an analytical treatment of the twodimensional flow of vertically rising plume on the restricted condition using the data by H.E. Kobus. In the report, not only the velocity profile of the plume is measured, but also numerical analysis on the velocity and width of the plume is made on the more generalized assumptions. Moreover, experimental constant necessary to make a numerical calculation in the existence of the tidal current is estimated.
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Masamitsu ITO, Shosaburo YAMASAKI, Masamitsu OKU, Masahiro TAMASHIMA, ...
Article type: Article
Pages
139-148
Published: September 30, 1982
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Hydrodynamical characteristics of propeller at design condition are analized by propeller lifting surface theory with accuracy. To extend lifting surface theory to the analysis of controllable pitch propeller (CPP) performances at off-design condition, there are two major problems. l) Is boundary layer assumption for flow on CPP blade at off-design condition formed? Otherwise, it is impossible to apply lifting surface theory to the analysis because it is essentially potential theory. 2) Can mathematical model of free vortex at off-design condition be drawn? Investigation of first problem is described in this report. Four bladed CPP model with 257mm diameter was used for experiments. Flow on blade at design and off-design condition was visualized by depth tuft method and oil film method. No stall nor turbulent separation phenomenon was observed and it is concluded that boundary layer assumption is formed even at off-design condition of CPP. Therefore, hydrodynamical characteristics at off-design condition can be analized by extended lifting surface theory. If boundary layer assumption is formed, calculated pressure distribution can be examined indirectly by comparison of calculated and observed boundary layer characteristics. As a base of examination at off-design condition, boundary layer characteristics at design condition are calculated. They show good correspondence with the results by oil film method. Investigation of second problem will be reported in sequent report.
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Takaaki ISHIHAMA, Ken YOSHIOKA, Setsuo IWATA, Shunji TENMA
Article type: Article
Pages
149-155
Published: September 30, 1982
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Recently, many jack-up oil rigs have been constructed in Japan. The jack-up rig consists of two major structural components, i. e. platform and leg. Particularly, legs may govern the global strength of unit and, accordingly, strength should be carefully investigated. The legs are so designed not only to support platform weight but also to withstand environmental load due to wave and wind etc. And, these loads are transmitted in way of engagement of jacking unit and contact with leg guides. Noting the actual behaviour of unit under expected loads, authors, first of all, have studied the local strength in way of leg and jacking unit by experimental approach.
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Takehiko INOUE, Masahiro SUDO, Yoshiro YAMAWAKI, Shin TAKEUCHI
Article type: Article
Pages
157-164
Published: September 30, 1982
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In order to improve the propulsive efficiency of a ship, HZ nozzle installed just in front of a propeller has been developed. In this paper, vibration characteristics of HZ nozzle have been investigated by full scale experiments and FEM analysis. The results obtained are as follows; 1) There are two basical vibration modes which are symmetrical and asymmetrical, and the difference of the natural frequency between them is about 10%. 2) Coupled effect of rudder and shoe piece is negligible. 3) The natural frequency of HZ nozzle in water is reduced to about 55% of that in air. 4) A simplified formula which is convcnient for the design of HZ nozzle, gives a good estimation of the natural frequency of HZ nozzle.
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[in Japanese]
Article type: Article
Pages
165-168
Published: September 30, 1982
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[in Japanese], [in Japanese]
Article type: Article
Pages
169-173
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Article type: Appendix
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175-176
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Article type: Appendix
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177-178
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Article type: Appendix
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179-182
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Article type: Appendix
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App1-
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Article type: Appendix
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Article type: Appendix
Pages
1-40
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Article type: Index
Pages
41-47
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Article type: Appendix
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Article type: Cover
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