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Article type: Cover
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Cover1-
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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Article type: Cover
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Cover2-
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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Etsuji KAJITA
Article type: Article
Pages
1-7
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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As for the dynamic property of the launching fat, there are some reports carried out by means of the sliding test and the disc test plate. However, the method of the sliding test has a drawback that friction line is short compared with the actual launching way. The second method is also an effective one and was used by Dr. Suetsugu, but his testing machine was so small that the scale effect of breadth seems to exist. The author adopted the method of disc test plate and carried out the test using a large disc testing machine which removes the drawback of the small machine. In this paper, the result of the test is reported.
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Hiroshi OKAMOTO, Hiroshi KAWAGUCHI
Article type: Article
Pages
8-14
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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It is an actual situation of today that giant oil tankers are commomly equipped with a screw propeller of five propeller blades. In this paper is taken up the problem of blade number and discussed the merits of six-bladed propeller. We, authors, recommend the use of six-bladed propeller on giant oil tankers for their advantages in decreasing vibratory forces and moments induced by propeller without affecting propulsive efficiency. The paper also represents the results of our model propulsion tests on four-, five- and six-bladed propellers, wake pattern data calculated values of propeller forces and an example of a 70,000 DWT oil tanker equipped with a six-bladed propeller.
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Masatoshi BESSHO, Toshiaki MIZUNO
Article type: Article
Pages
15-22
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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Further resistance tests of three models described in the first report are carried out in their half load condition. The result is similar as the one in the full load condition, but it is found that the resistance of the transom stern model T is slightly greater than than the one of the model R in contrary with the former test. However, this does not always mean the general conclusion because these models have primitive and not-faired ship lines. The calculated wave-making resistance has the same order of magnitude as the residual resistance in both conditions and this is a merit to draw ship lines corresponding to the submerged ship type distribution. The last part of the present report discusses with the frame line configuration, especially of the aft-body, in hydrodynamical aspect of view, and shows the method of its theoretical derivation by a simple example applying the slender thin body theory. This way of approach to designing favourable ship lines seems very much fruitfull.
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Hajimu MANO
Article type: Article
Pages
23-32
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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The cross girder system with large centre girder and bottom transverses, has been one of the most common type of bottom structure in centre cargo oil tanks of tankers. It is not sure, however, that this construction system is suitable one for tankers with long tanks. Calculating the reaction forces acting between the centre girder and bottom transverses, the following conclusion is obtained : Judging from the weight of material required, the bottom structure constructed only with transverses is the optimum one for cases of long tanks having aspect ratio over 1.0. As it is required for the centre girders to have sufficient strength to resist loads transmitted from keel-blocks in a dock or on a building berth, it is rather difficult to employ this type of construction to actual ships. In this paper, the loading condtion is also analyzed, and it is clarified that bottom structures which are simlar to the one without the centre girdre may be used for actual ships, because the minimum scantling of the centre girder required to support the load is very light.
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Hajimu MANO
Article type: Article
Pages
33-40
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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It is laborious for designers to calculate deflections of hulls under longitudinal bending moments and shearing forces. Moreover, the deflections which are estimated by the approximate formulae are usually not accurate. In this paper, the author presents new methods to calculate or estimated deflections at midship and deflection curves for the following three cases : (a) For calculation of the deflections at the midships and deflection curves from bending moment curves more simply. (b) For calculation of the deflections at the midship directly from the weight curves and buoyancy curves, regarding the hulls as beams of uniform cross sections. (c) For estimation of accurate deflections at the midship at the stage of initial design.
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Wataru YASUKAWA, Toshio TSUTA
Article type: Article
Pages
41-47
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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In this report, the inelastic local buckling of webs of beams under combined bending and thrust were investigated. The theoretical solution was derived based on the plastic deformation theory under the assumption of elastic perfectly plastic material. In order to study the validity of the theoretical solution, experiments were carried out for two types of specimens, one of which was built up I-section and other was T-section in conjunction with plate. As the result of comparing the numerical calculations with experiments, the following important informations were obtained. 1. The results of theoretical calculations for critical strains showed comparatively good agreement with experiments. 2. The effect of the cross sectional configurations to the critical strain of webs and the effect of the thrust to the critical depth and thickness ratio of web were clarified. 3. According to the theoretical and experimental results, critical depth and thickness ratio of web is larger especially in lower strain range than that indicated by G.Haaijer.
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Ko NISHIMAKI, Koji MORIGUCHI, Tomozo GO
Article type: Article
Pages
48-56
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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Fatigue tests of mother and welded metals were done on Aluminum alloys used for welded structure. Four kinds of Al-Mg alloys (work hardened alloys), two kinds of Al-Zn-Mg alloys (age hardened alloys) and three kinds of forged Aluminum alloys were tested. Plane bending fatigue test was adopted to get the fatigue strength, and stresses obtained by measuring surface strains of each specimen were used to analyze the test results. Main results obtained were as follows ; (1) For the tested matererials, the relatios between ∂_a/∂_y and ∂_y or H_v were represented approximately by linear functions at each number of cycle within the range of 10^4∼10^7. (2) Blow-holes due to welding did not have any effect on the fatigue strength of each alloy. (3) It is very likely that the improvement of hardness of the welded Al-Zn-Mg alloys, which may concern with the improvement of the fatigue strength of welded part, can be stimulated effectively by artificial heating at about a temperature of 80℃.
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Iwao MURAKAMI
Article type: Article
Pages
57-67
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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In diesel ships, it may be considered that one of effective methods for reducig fuel oil consumption and engineers' works is to drive the ship's service generator by the combined power of the steam turbine energized by the exhaust gas boiler of the main engine and a part of the main engine power gained through a converter. When the output of the steam turbine which is energized by the exhaust gas boiler of the main engine exceeds the power of the electric service loads, the excess power can be fed back to the propulsion shaft through the converter. In case the output of the steam turbine is insufficient, the shortage can be supplied to the turbine by converting a part of the main engine power. Therefore, for the diesel ships of small engine, it is not necessary to run the steam turbine and the diesel generator in parallel, and for those of large engine there is no need to diffuse away the excess energy of the exhaust gas boiler. In this paper, the author tries to introduce the possibility of the methoe based on some data of conventional oil tankers, ore-carrier and cargo ship.
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[in Japanese]
Article type: Article
Pages
68-75
Published: June 30, 1966
Released on J-STAGE: February 25, 2018
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Article type: Appendix
Pages
76-79
Published: June 30, 1966
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Article type: Appendix
Pages
App1-
Published: June 30, 1966
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Article type: Appendix
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App2-
Published: June 30, 1966
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Article type: Appendix
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Published: June 30, 1966
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Article type: Appendix
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Published: June 30, 1966
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Article type: Appendix
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Published: June 30, 1966
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Article type: Appendix
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Published: June 30, 1966
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Article type: Appendix
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App7-
Published: June 30, 1966
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Article type: Appendix
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Published: June 30, 1966
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Article type: Cover
Pages
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Published: June 30, 1966
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