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Article type: Cover
Pages
Cover1-
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Published: March 30, 1957
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Toshio YOSHIDA, Kazusuke MATSUNAGA
Article type: Article
Pages
1-7
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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The discussion in this paper on the process of the assembling on slab in shipbuilding is based on a 38,500t oil tanker. The figures in this paper may, therefore, not be suitable in every cases. They will require some modifications according to the welding efficiency. However, the following summary may be given from the result obtained: 1. In a case of the assembling on slab of a 38,500t oil tanker with the assembling period 5 months and slab coefficient 59.3 (average slab efficiency 1.7t/100m^2/day), considering peak time along, it is necessary to provide with manual welding arrangement of 0.93 unit/100m^2 and automatic welding of 0.1 unit/100m^2. 2. In this case crane arrangement of one unit for 1,500m^2 is necessary, but sufficient allowance should be made in practice. 3. Even if the assembling period be shortened to 3 months, peak alone being taken into consideration, hardly any modifications are required in the welding and crane facilities which are needed for 5 month assembling period. 4. Since the peak times of slab efficiency and of welding do not always fall on each other, it would not be adequate to study the welding equipment on the hasis of slab efficiency only.
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Jitsuzo NAGAO
Article type: Article
Pages
8-11
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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I-sections used for hatchway shifting beams have many advantages over the welded beams composed of flanges and webs: saving of labour and cost and also reduction of the working area. However, the standard sizes of I-beam are not so many that often we are obliged to use inappropriate sizes, resulting in increase of the total weight or number, and the merits of I-beams are lost consequently. To remove the inconvenience, some new sizes of I-beams, which will meet the requirement of shipbuilders, are proposed in this paper. At present, the scantling of the hatchway beams has to comply with the Load Line Regulations and Classification Society Rules. Considering that the weakest section of the beam supported at the both ends and loaded uniformly is not at its middle point, additions or revisions are hoped to be introduced into the rules which will increase the usefulness of the I-beams.
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Eisuke IWASA, Kenji TAGUCHI, Masaru IKEDA
Article type: Article
Pages
12-18
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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As to the so-called crowed stream caused by people of high density rushing into a narrow doorway, the authors have studied in their latest report on the relation between the width of the doorway, the time required them to pass through and the frequency of arch-action occurred. Now the form itself of the doorway should also be considered in the above relation. By the experiment after the latest one the authors have come to a conclusion on the relation among the form of doorway, time required them to pass through and frequency of arch-action. It could not, however, be confirmed completely by experiment on account of difficulty about the equipment, but the present study will serve as data for planning of doorway and passage.
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Takao MOTOOKA
Article type: Article
Pages
19-24
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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In this paper is reported the two cycle supercharged diesel engine, 7RSAD76, constructed by the Kobe Shipyard & Engine Works of Mitsubishi Heavy-Industries, Reorg., Ltd. The engine has seven cylinders and develops 10,000 BHP at 121 RPM. Its fuel consumption is about 154.5 and 156.5 gr/BHP/hr at 75 to 85% of full power and at full load, respectively. Accordingly it is concluded that the engine output is increased by about 50% and the fuel consumption is considerably decreased compared with the unsupercharged engines. It is infered from the shop test conducted in the shipyard that the engine would be able to develop about 5,000 BHP, should one of the chargers go wrong, and further about 3,000 BHP even in the case of trouble of all the chargers. The air, which is designed to be drawn into the underside of each piston when all of the chargers are defective, can be used as scavenging air as it is compressed by piston motion, and such feature in the design enables the engine to keep continuous running without chargers. The engine has many special features beside the above one. Starting and accelerating of the engine are so smooth and easy that its manoeuvering is as easy as that of the unsupercharged engines. The result of the shop test shows that the temperatures of the piston and liner are about the same with those of unsupercharged engine, proving its perfect durability. Further, the mechanical efficiency of the engine is remarkably high owing to a scavenging system with the scavenging and exhaust ports fitted with oscillating valves, and its dismantling and overhauling can be done as easily as those of unsupercharged engines, because the chargers are fitted at the middle stage of the engine. Welding minimizes the weight of the engine with no harm on the rigidity of the construction to be required. It must be noted that the engine is designed especially for burning bunker oil.
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Kazuo TERAZAWA, Junkichi YAGI
Article type: Article
Pages
25-32
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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There have been presented many investigations on the stress distribution at the hatch corner, but there are few researches on the stress distribution in the deck plate between hatch openings. The effectiveness of the plate on the longitudinal strength of ship is not understood quantitatively. Therefore, to find the effective breadth of the deck plate in the vicinity of the hatch opening, neglecting the stress concentration at the hatch corner and taking account of the shear lag effect, the authors presented a tension theory of the deck plate by the help of the Reissner's energy method. The stress distribution calculated by the theory was in good agreement with the results obtained by the tension tests of large scale deck models. The relations between the effective breadth of the deck plate and the size of the hatch opening are shown by the curves in the paper.
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[in Japanese]
Article type: Article
Pages
33-36
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
36-40
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
40-41
Published: March 30, 1957
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Article type: Appendix
Pages
42-43
Published: March 30, 1957
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Article type: Appendix
Pages
App1-
Published: March 30, 1957
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Article type: Appendix
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Published: March 30, 1957
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Article type: Appendix
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Published: March 30, 1957
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Article type: Appendix
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Published: March 30, 1957
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Article type: Appendix
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Published: March 30, 1957
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Article type: Appendix
Pages
App6-
Published: March 30, 1957
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Article type: Cover
Pages
Cover3-
Published: March 30, 1957
Released on J-STAGE: February 24, 2018
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