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Published: December 30, 1981
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Hideo KUDOO, Takeshi SAKAMOTO, Etsuji KAJITA
Article type: Article
Pages
1-9
Published: December 30, 1981
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According to a recent tendency of spreading the area of harbor constructions, it is expected to develope a high efficiency multi-purpose work ship for harbor construction to be able to work around an isolated island and even in severe sea conditions. An experimental investigation is planned as a part of the project to develope a multi-purpose work ship functioning as a base station on the sea. Requirements for the investigation are (1) Developing a mooring system to endure against the 50 years storm. (2) Clarifing the behavior and the mooring forces of the ship moored in such a rough seas. (3) Investigating in the ship motions at the working condition. The aim of the present experiments are to study the items (1) and (2). This paper outlines the results of the experiments and calculations on the behavior and the mooring forces of the ship moored with three proposed systems in the simulated rough seas. The project is conducted by the 4th District Port Construction Bureau, Ministry of Transport.
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Ryuji SAKATA, Yoshio YAMAGAMI, Kiyoshi NEMA
Article type: Article
Pages
11-18
Published: December 30, 1981
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In regard to a box type floating vessel as one of the fundamental configurations of a floating offshore structure, this study has been proceeded with to establish a practical estimating method of its motion in waves of high accuracy. The authors have carried out forced oscillation tests, wave exciting force tests, and motion tests in beam, head and oblique seas by use of box type vessels of low length-to-beam ratio (L/B) which is supposed to have three-dimensional effect, and made two-dimensional and three-dimensional theoretical calculations. The three-dimensional calculation gives accurate values of almost all hydrodynamic coefficients and wave exciting forces excluding damping term of rolling, etc., but it has a disadvantage that CPU time is long. Therefore, as a practical estimating method of the motion, the authors have developed a Modified Strip Method (M.S.M) on the basis of the strip method of short CPU time, taking account of experimental results and three-dimensional calculation results. The M.S.M. is as follows: 1) Longitudinal strip method is adopted as well as ordinary transverse strip method. 2) Strict Strip Method (or S.T.F.) is introduced for estimating wave exciting force. 3) Correction of three-dimensional effect is made, based on experimental results and three-dimensional calculation results. 4) Estimating method of eddy damping for roll is modified, taking three-dimensional effect and shallow water effect into consideration.
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Yasuo YOSHIMURA, Masao ISHII, T. F. HUANG
Article type: Article
Pages
19-27
Published: December 30, 1981
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For safe ship handling it is necessary to predict the steering quality of a ship with sufficient accuracy at an early stage of design. For this prediction, correlation of steering quality between model and ship must be investigated, although steering quality of model itself can be directly evaluated by a free-running model test or can be predicted by a mathematical model based upon some captive model test. In the present paper, we propose some model-ship correlation formulars about rudder effectiveness and rudder torque, which is found from the experimental results of a 564,000 DWT ULCC and its scale model. They are also confirmed by other ULCCs' experimental results.
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Sadao KAKIZAKI, Kazuyuki KIHARA, Shigeru ASAI, Katsunori HATAKENAKA
Article type: Article
Pages
29-35
Published: December 30, 1981
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To obtain high efficiency of cable laying operations, "tractor-type cable ship" was designed, which is equipped with a pair of vertical axis propellers near the bow. Because of this unconventional ship form and arrangement, confirmation of its manoeuvrability was essential from early stage of ship design. Experiments by use of a free-running model and full-scale ship trials were carried out to confirm manoeuvrability in ahead and astern runs. And it was assured that this ship form shows the expected steerability and fulfills the design requirements.
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Hiroyuki ADACHI, Munehiko HINATSU
Article type: Article
Pages
37-45
Published: December 30, 1981
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The separation method of the ship resistance components is investigated both experimentally and numerically in this paper. The separation method is defined in the near field and the far field. The calculation is performed by the near field separation. And the experiments are performed by both separation methods. The Wigley model is used as a typical thin ship. The calculation shows good agreement with the experiments.
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Katsuyuki TOMIYOSHI, Mikihiko NAKAYAMA, Kazuo KADA, Akira KOSAKA
Article type: Article
Pages
47-57
Published: December 30, 1981
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When designing large tanks in ships, we have considered qualitatively various sloshing phenomena which have not been confirmed experimentally yet. This report presents on experimental studies of some items among these sloshing phenomena. The studies include investigation of relations between the corner shape of tank and sloshing pressure and also investigation of relations between sloshing pressure and the angle between the rolling axis of tank and the center line of tank. Tests were carried out by putting three kinds of model tanks on a rolling apparatus which was capable of simulating regular pitching or rolling motion only. These three models were the same dimension, but the corner shape was different among them. The first type of model has no obstacle inside of tank and the corner shape is square. The second type has some stiffeners around the top corner and the corner shape is square. The third type has cylindrical corner without stiffeners inside. Main items obtained by these experiments are follows: (1)Top corner shape has a large effect on the sloshing pressure and cylindrical corner reduces the sloshing pressure significantly. (2)The sloshing pressure around the corner becomes higher when the tank is rolling diagonally.
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Koichi OSHIMA, Hiroo OKADA, Yoshio FUKUMOTO
Article type: Article
Pages
59-66
Published: December 30, 1981
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In this paper, the compressive strength of clamped plates (aspect ratio α=1,2 and ∞ (infinitely long plates)) under combined loads of compression and hydrostatic pressure is theoretically investigated. At the same time, effect of aspect ratio of plates on the buckling and compressive strengths are also discussed from these results including those in previous studies. Results obtained in this study are summarized as follows: 1)From results on the buckling strengths for clamped plates (α=1,2,3,4 and ∞), it is found that the behaviour and occuring range of buckling phenomenon for each case are different but the change of buckling strength with hydrostatic pressure for each case is almost same except the case of α=1; 2)The compressive strength of clamped plates (α=1,2 and ∞) is calculated in the same way as the previous studies, and characteristics of the compressive strength and the collapse mode of the plates are clarified. 3)From above results including those for plates of α=3 and 4, it is found that the compressive strength for the plate of α=∞ in comparison with those for finitely long plates of α>__=1 is wholly lowest under same non-dimensional pressure qb^4/Et^4, and effects of aspect ratio of the plate on the change of the compressive strcngth with hydrostatic pressure for each case are generally similar to that in the case of simply supported plates.
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Junkichi YAGI, Toshihiko FUNAKI, Mineaki INUI, Noki TAKAHASHI
Article type: Article
Pages
67-76
Published: December 30, 1981
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The catamaran ship has twin hulls and a connecting deck. Stiffness of the connecting deck is generally very small compared with that of each hull. Therefore, to analyze motion of ocean-going catamaran ship in oblique waves, effect of elastic deformation of the deck can not be neglected. In this paper, considering forces acting in the deck induced by relative motions of the twin hulls, the motion of each hull in oblique waves was analyzed. And effect of stiffness of the deck on ship motions of the twin hulls and wave loads in the deck due to these motions were investigated.
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[in Japanese]
Article type: Article
Pages
77-81
Published: December 30, 1981
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[in Japanese]
Article type: Article
Pages
83-86
Published: December 30, 1981
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Article type: Appendix
Pages
87-89
Published: December 30, 1981
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Article type: Appendix
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Published: December 30, 1981
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Article type: Cover
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Published: December 30, 1981
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Article type: Cover
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