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Article type: Cover
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Cover1-
Published: March 30, 1971
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Article type: Cover
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Cover2-
Published: March 30, 1971
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Article type: Appendix
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App1-
Published: March 30, 1971
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Tsunao ISHIHARA, Masanobu ODA
Article type: Article
Pages
1-14
Published: March 30, 1971
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A large number of enlargement conversions has been effected hitherto and is likely to be increased more and more. In order to meet with this trend, MHI has made a serious study on a suitable type of ships to be enlarged by conversion and on a presumable limit to increase deadweight tonnage by means of the so-called "3 dimensional conversion" especially for tankers in view of both technical and commercial aspects. As the result, it has been proved that the tankers of 30,000-90,000 DWT built before 1965 are the expected type at present to be most economical for enlargement conversions. For instance, to take 50,000 DWT tankers, about 100% increase of deadweight is assumed to be the limit of enlargement conversions technically and about 70-80% increase to be most advantageous commercially, but from the viewpoint of the overall returns of the enlargement conversions it has been clarified from this study that about 100% or more increase shall be gained, depending upon the freight market of course. With regard to the larger tankers of more than 90,000 DWT, further investigation shall be made from various angles. And, this problem should be taken up for scrious study by both shipping and shipbuilding fields viewing of worldwide shortage of tanker tonnage, and of the tendency of rapid increase of tanker size.
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Masaki WATANABE, Yoshikazu IKEMOTO
Article type: Article
Pages
15-23
Published: March 30, 1971
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This paper deals with thermal stress distribution analysed by the finite element method, in welded pipe joints of fcrritic steel and austenitic stainless steel, taking into consideration of the effect of difference in the expansion coefficicnts (500℃). The results are summarized as follows. (1) Stress distribution of the weld interface depends upon the bevel angle of the joint. For example, σ_0=35 kg/mm^2 is found in the ferritic side of I-butt joint, but σ_0 (outer surface)=23.8kg/mm^2, σ_0 (inner surface)=47.1 kg/mm^2 in the case of 45° レ joint. On the while, in any case, the normal and shear stress to the weld interface are comparatively small. (2) Distribution of the axial stress σ_z on the outer surface close to the fusion line is quite different from that calculated by Mather's method. And considerably high maximum value of σ_z is induced in this region,
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Hideo SASAJIMA, Chong Dal OH
Article type: Article
Pages
25-34
Published: March 30, 1971
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This paper is the presentation of a method of analysis of propulsive performance of super tanker models which were investigated at Panels 41, 61 and 98 of the Shipbuilding Research Association of Japan. Those researches were consisted of series tests varying L/B, B/d, C_b and l_<cb> of models. In this paper the propulsive performances are analyzed as functions of a variable which represents aft body fullness instead of ordinary-used variables such as L/B, C_b and l_<cb>, with B/d as a subparameter. As the result of analysis seems to be satisfactory on the whole, the present method may be conveniently used at preliminary stage of design.
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Atsushi SHINTANI
Article type: Article
Pages
35-42
Published: March 30, 1971
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With three ship models having C_B=0.60, 0.70, 0.80 of Series 60 parent forms, and five ship models of high speed ship forms, pitch, heave and resistance increase in regular head waves are obtained from experiments and theoretical computations. From the results of the experiments and calculations, the influences of block coefficients, beam-draft ratios and displacement-length ratios on pitch, heave and resistance increase in regular waves are investigated. It is shown that the larger the block coefficient, the beam-draft ratio or the displacement-length ratio the larger the resistance increase. Since damping coefficients of ships of large beam-draft ratios are larger than those of ships of small beam-draft ratios, it is also concluded that the pitch and heave of the former are smaller than those of the latter.
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Matao TAKAGI
Article type: Article
Pages
43-46
Published: March 30, 1971
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Resistance increase in head seas is investigated by the perturbation method. In this study, it is assumed that ships are of Michell type and the amplitudes of heaving, pitching, and surging are same order. The results are the following: (1) The linear theory is insufficient in the range of short wave length and the term of interference between incident wave and radiative or diffractive wave must be considered as in Maruo theory. But, in the range of long wave length, the former theory coincides with the results obtained in this study. (2) The effect of surging motion on resistance increase must be considered under the said assumption.
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Susumu HIRANO
Article type: Article
Pages
47-55
Published: March 30, 1971
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To investigate the longitudinal stability of a submarine ship moving horizontally near the free surface, the author tried to conduct the experiments on the motion in a vertical plane and the measurements of three component forces with a tail-stabilized submarine ship model. The model is a submerged ellipsoid ellipsoid of revolution, the length of which is 1.8m and the maximum diameter 0.3m. The submergence of the model was varied from 0.15 to 0.60m. From the test data, the balance points at which the model can navigate horizontally at a constant depth were calculated. Since the tail-stabilized model must be balanced by the only one control surface under the large lift and longitudinal moment, the balance points are limited. The dynamic stability is calculated and it is found that the model is stable only in a region near the depth of 0.20m at the Froude number 0.4, due to the lacking of stabilized fin area.
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[in Japanese]
Article type: Article
Pages
57-63
Published: March 30, 1971
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[in Japanese]
Article type: Article
Pages
64-67
Published: March 30, 1971
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The Advanced Living System Research Committee (Abbreviation: LSK) in the Kansai Society of Naval Architects started the research of future living system of ships. The Committee assumed that the ships to which the result of the research is to be applied are as follows: (1) Ocean-going non-passenger ships (2) Ships the crew of which consists of only one race of the Japanese or similar living standard (3) Ships built from 1975 to 1979 The Committee studied the design policy for these ships, and settled the future prediction consisting of 19 basic conditions for living quarters as follows: (1) Reduction of time on board (2) Reduction of number of crew (3) Embarkation of women (4) Embarkation of people other than the Japanese (5) Increase of watching work (6) Increase of monotony (7) Increase of Ioneliness (8) Increase of free time (9) Thirst for nature (10) Variety of amusement (11) Improvement of environment on board (12) Serious consideration for safety (13) Improvement of service task (14) Rejection of mass products (15) Growing up of mental health problem (16) Increase of size and speed of ships (17) Creation of attractive work (18) Decrease of candidate for crew (19) Change of shipbuilding process
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Article type: Appendix
Pages
68-
Published: March 30, 1971
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[in Japanese]
Article type: Article
Pages
68-
Published: March 30, 1971
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Article type: Appendix
Pages
68-
Published: March 30, 1971
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Article type: Appendix
Pages
69-74
Published: March 30, 1971
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Article type: Appendix
Pages
App2-
Published: March 30, 1971
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Article type: Appendix
Pages
App3-
Published: March 30, 1971
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Article type: Appendix
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Published: March 30, 1971
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Article type: Appendix
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Published: March 30, 1971
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Article type: Cover
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Published: March 30, 1971
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