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Article type: Cover
Pages
Cover1-
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
Cover2-
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
App1-
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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Kiyoshi TAKASHIRO, Takeshi OIKAWA, Ryotaro OGIWARA
Article type: Article
Pages
1-8
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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An attempt was made at the designing of a 50,000 DWT ore carrier to decrease the number of transverse bulkheads in wing tank part by means of increasing the length of tanks as long as possible, but such arrangement was found to be rather difficult because of the NK requirements that an ore carrier must remain afloat with two adjacent compartments flooded. Therefore, in order to reduce an inclining moment at flooding, alternate wing tanks on one side of the ship were connected with those on the other side through double bottom compartments as shown in Fig.1. The effect of this arrangement was thoroughly proved by a series of experiments using a ship model to a scale of 1/100. The following observations were also made at the experiments; (a) the effect of trim on heel angle,(b) the effect of GM on heel angle at various trim conditions, (c) the effect of width of the connected tanks on heel angle, (d) ore hold flooding.
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Shoichi SUDO, Takaaki TANIMOTO, Masami HIKINO, Yoshihisa SAKAMOTO, Yoi ...
Article type: Article
Pages
9-18
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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The cargo boat of LCU-Type, which was built at the Mukaishima Shipyard of the Hitachi Shipbuilding & Engineering Co. Ltd., had wide breadth and shallow draught in relation to her length. Moreover, the ship was fitted with twin propellers turning in the same direction (clockwise, from, stern towards bow).Therefore, the poor course-keeping quality of the ship was suspected when the initial design was started. Then a preliminary experiment with a small model was carried out in order to design the form of hull and skegs. After determination of the hull form, another self-propelled model, fairly large, was made for the experiments on the course-keeping quality at the Mitaka Model Basin of the Transportation Technical Research Institute. When the ship was completed, a special experiment called a spiral test was carried out on her. In this paper, details of these model and actual ship experiments are described, model-ship correlations on the turning and course-keeping qualities are examined, and the course-keeping quality of the ship is discussed. The conclusions thus obtained are as follows : (1) The self-propelled model has a good course-keeping quality. (2) The turning quality of the actual ship is very similar to that of the model when the helm angle is more than 5 degrees. (3) The characteristics of turning traces can easily show the unfavourable course-keeping quality both on the model and the ship. (4) The course-keeping quality which is believed very good in case of the model, showed riot the similar but rather worse tendency in case of the actual ship. However, it was confirmed on the sea trials and also in the actual services that the ship is satisfactory in her course-keeping quality.
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Seiya MUKOHARA, Hiroyuki FUJIO
Article type: Article
Pages
19-23
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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An investigation on actual propeller with different particulars has been carried out by a committee in Kansai Society of Naval Architects. Results are obtained about the standard stress and about the blade thickness margin left for N.K. rule requirement. Table 1 shows the summary of the results, blade thickness being measured at 0.25% of the radius. As for the stud diameter, 2 to 10% margin left for the N.K. rule requirement may be recommended based on the past results.
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Teizo OUCHI, Yosiharu TERADA
Article type: Article
Pages
24-26
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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This is the report of the authors' recent experimental research on rubber sheet ring of fistulous section and the construction and the necessitated operating power of the gate valve completed with the rubber sheet ring. Generelly speaking, rubber as rubber sheet ring is considered one of the most suitable materials for those valves dealing with liquid mixed with hard foreign substance such as grit and clay as in the case of dredge piping, in view of anti-abrasion as well as watertightness of sheet ring and disc combined. In an attempt to develop more suitable rubber sheet ring for those sevice gate valve providing more better durability and lessening effect of valve operating power, the authors have carried out preliminary experiment on the shape and physical properties of the rubber sheet ring. The following are detail of them.
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Takashi MATSUNAGA, Yoshinori ITO, Yasumi KAMINO
Article type: Article
Pages
27-37
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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We have investigated the merits of porous chromium plating as a protection against the wear of cylinder liner, which is increasing by the use of low grade fuel oils for large marine diesel engines. d liners (over 500mm in diameter) fitted experimentally on an actually servicing ship cleared up the following facts. (1) Porous chromium plated liners not only have remarkable wear resistance (about 1/3 of the wear rate of cast iron liner) but also decrease wear of corresponding piston ring to a large extent. (2) Wear in porous chromium plated liners is mainly due to the corrosion by acid corrosive products (chiefly H_2SO_4) produced on their interior wall. But the growth of the corrosion by acid can be arrested by adjusting the cylinder oil supply. In view of these results, porous chromium plated liners not only increase wear resistance of the cylinder liners but also prolong the intervals of overhauling in large marine diesel engines, compared with the case of cast iron liners.
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Kozo YAMANE
Article type: Article
Pages
38-42
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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When a marine diesel engine is succeedingly repeated to start by means of compressed air, the compressed air pressure in the air reservoir goes down according to the theoretical formula P_1/P_2=σ, where P_1, P_2 denotes each air pressure in the air reservoir before and after the engine starts, and C a constant. This is proved by test results on many motor ships in their sea trials. Based on this formula we can calculate the number of repetition of starting the engine within the limits of adequately high air pressure in the reservoir.
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Jihei NAKABAYASHI, Kazuyuki IMAMURA, Akio INANO
Article type: Article
Pages
43-47
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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A practical method is described to solve the torsional vibration problems on dieselgenerator units for ships' use. There are some ways for avoidance of the torsional resonances. The way to be mentioned is to decide the appropriate dimensions of the generator shaft. Graphic method with characteristic curves is useful for easier and quicker selection of generator shaft.
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[in Japanese]
Article type: Article
Pages
48-52
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
53-56
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
57-60
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
61-66
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
67-68
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
Cover3-
Published: July 30, 1963
Released on J-STAGE: February 24, 2018
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