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Article type: Cover
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Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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Article type: Cover
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Published: September 30, 1970
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Akitsugu MORI
Article type: Article
Pages
1-5
Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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The following points are emphasized in this paper. (1) A new control system developed by the author is adopted at the pre-erection-stage. (2) The stage-area is developed into two functional parts, a group of working areas and a stock area, to the best advantage. (3) Many kinds of jobs are organized to the standard working process. (4) Every working process in the pre-erection-stage is made clear and the working-schedule is made easily by the above mentoned standard process. (5) The process-control-staff is able to get requisite information from every stage of working processes, and concequently able to remove trouble properly at the pre-erection-stage.
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Atunao NANBA, Katuyuki TOMIYOSHI, Mikihiko NAKAYAMA, Seiji MIYAZAKI, Y ...
Article type: Article
Pages
6-11
Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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It is well known that sagging deflections are induced at full loaded condition in aft engine ships, such as tankers. These sagging deflections cause the loss of dead weight even though there might be no trouble of ship strength. One of the factors inducing these sagging deflections may be considered the shrinkage caused by welding of block butts in constructing a ship on building berth. We call the deflection induced by this welding shrinkage "initial deflection". We investigated the initial deflections comparing actually measured deflection with theoretically calculated one for about twenty ships and found the initial deflections could approximately be represented by the following expression; δ=0.75L/Dn-77 (mm) where, δ=initial deflection L=length of ship D=depth of ship n=number of block butts To eliminate the initial sagging deflection, we decided to construct a ship in intentional hogging form equal to initial sagging deflection at the stage of ship construction on building berth. We have actually provided about twenty ships with intentional hogging deflections and obtained good results without any trouble.
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Akio MORI, Takaharu NISHIMURA
Article type: Article
Pages
12-17
Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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This is to introduce the measurement results of temperature distribution around bearings and of deflections at double bottom and shaft center of three large vessels. These items supposed to have an important effect on shafting alignment. The measurement was carried out for four conditions; hot and cold conditions in each of ballast and full loaded conditions. However, as it is only three vessels that were used for this measurement and moreover the measurement data of each vessel are not altogether complete, it is difficult to analyse factors having effect on shafting alignment only from these data. Therefore a rough tendency on the results of measurement is reported as follows. 1. As to temperature distribution, the effect of the position of L. O. sump tank and thrust bearing cannot be neglected. Especially that of L. O. sump tank position is important. 2. With the change of the draft from ballast to full loaded condition, convex deflection occurs to the double bottom. In shafting alignment, therefore, it is assumed that the effect of this deflection cannot be neglected as well as that of the shafting deflection by thermal expansion around bearing. As a matter of fact, the measurement value of the shafting deflection at shaft center is very small. Therefore the shafting do not seem to be affected by the above-mentioned change in the draft. About this fact, further study is considered necessary. 3. The calculated thermal expansion of reduction gear casing, with some correction, agrees with the measuremet value.
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Hiroshi SUNAHARA
Article type: Article
Pages
18-21
Published: September 30, 1970
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Three methods of inclining test are introduced. An improved type of U-tube device which consists of one level gauge, one water tank and a connecting hose, is superior to a conventional U-tube or a pendulum method in accuracy and workability for measurement at inclining tests. Making use of water ballast as inclining weight is useful for large sized vessels having upper wing or side tanks, for which otherwise a large amount of solid ballast is necessary. Free surface effect can be utilized by filling shallow water into hoids in case of vessels without upper wing or side tanks but having large GM at inclining test.
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Itsuo KAWAI
Article type: Article
Pages
22-30
Published: September 30, 1970
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Prompt introduction of the automating instrumentation and the central control system has been achieved in a present-day world's shipbuilding industies, but it has been encountered by a great difficulty in that only a few of the pickup transducers (a means of converting a physical quantity into the corresponding electrial quantity) so far available are dependable enough to ensure the satisfactory embodiment of planning the described system aboard a ship. Present report deals with the result of the author's research for a unique mechanism and performance of the Linear Transformer and various devices incorporating it in a ship's instrumentation operating on the electrical principles.
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Toshio TSUTA
Article type: Article
Pages
31-43
Published: September 30, 1970
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Concerning longitudinal strength of container ship, the effectiveness of deck between hatches has been studied and an analytical solution derived for container ship which has 3 row hatches at midship part. Some model experiments has been carried out using a box type model and compared with the calculation. They showed good agreement. So, an actual ship built in our factory has been analysed by the method and the result was checked by the finite element solution and also by test results at launching. Good agreement were confirmed among them.
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Atsushi SHINTANI
Article type: Article
Pages
44-50
Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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The resistance increase of ships in regular head waves has been calculated by Maruo's method and by the modified Maruo's method which was developed by Nakamura and Shintani. In general, numerical results of resistance increases which are obtained by the strip method on ship motion show good coincidence with experimental results. Better agreements are seemed to be obtained by the modified method than by Maruo's method. In case of high speed ship forms, coefficients of resistance increases are influenced by the height of waves, and numerical results show good agreements with the value extrapolated to zero height of waves in experimental results.
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[in Japanese]
Article type: Article
Pages
51-57
Published: September 30, 1970
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
58-62
Published: September 30, 1970
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Article type: Appendix
Pages
63-64
Published: September 30, 1970
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Article type: Appendix
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Published: September 30, 1970
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Article type: Appendix
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Published: September 30, 1970
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Article type: Appendix
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Published: September 30, 1970
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Article type: Appendix
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Published: September 30, 1970
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Article type: Cover
Pages
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Published: September 30, 1970
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