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Article type: Cover
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Cover1-
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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Article type: Cover
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Cover2-
Published: March 30, 1970
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Michio KADOTA
Article type: Article
Pages
1-7
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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The fore and after poppet constructions which consist of wooden pillars reinforced by ribbands and rashing wires are customarily used for the launching of ships. The after poppet is considered as an important construction supporting stern weights of the ship and is usually arranged so as to allow stern overhang about 10% of the ship length. The author investigated its mechanism and contrived a simplified construction which directly supports the keel by transversely positioned strong steel girders instead of usual wooden pillars. A typical construction is illustrated in Fig. 1. Up to this time, three ships surely launched by the new method and labour required for constructing launching cradle was satisfactorily reducted The sizes of girders are theoretically determined taking the distribution of ship's weight, rigidity and displacement of cradles into consideration. According to the experimental results at launching, the theoretical prediction is in safe side for girder loads, however, this suggests that large force was acting at usual wooden cradle, especially at the aftermost block, because the sum of the loads is constant. The extent of size the application of this method is, then, discussed from the viewpoint of strength of the aftermost wooden cradle and launching way. Weight and rigidity distribution which provides most severe condition are obtained from many ship's data as shown in Fig. 5∼9. Stresses in the aftermost cradle under such distribution can be estimated by the formula (21), the result of which is shown in Fig. 10. Extremely high stresses of wooden pillars and sliding ways are found from experiment by old materials. Cradle stresses in Fig. 10 are bounded by broken lines obtained from the experiment. From the above investigations it is clear that large ship can be launched by using the new method so far as her length lies within the safe zone shown in Fig. 10. A design manual of the new construction is also presented.
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Kazuhisa KANAYA, Goro MATSUI
Article type: Article
Pages
8-14
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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About twenty years have passed after the technique of statistical quality control (SQC) was initially introduced to the industrial world of our country. Nowadays most of companies in Japan take part in this problem positively. According as the development of free trade, we have had a new understanding of importance of quality control as ways of rationalization and constitution betterment of the company, And, at the same time, the object of quality control has changed itself; Today's quality control means not only maintenance nor improvement of goods quality, but also quality control in general enterprize activities, so to speaK, total quality control (TQC). Therefore, the quality control activities will be given more and more important share in management. Generally speaking, the analysis of data from quality control have mainly depended upon human computation, and it has always needed plenty of time and labor to distribute the quality information to the authorities concerned. Sequentially, the main function of correct and speedy transmission of the information has often been lost in customary quality control. From this reason, we have had such an opinion that it will be the most urgent need to combine managers and labors functionally by way of introduction of a computer as an information processing facilitiy to parts of the quality control activities. Kawasaki Heavy Industries has also been executing the total quality control. In this report, we want to introduce especially a successful example of the on-line-controled computer system for quality control.
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Ryo TASAKI, Hiromitsu KITAGAWA, Koichi KOYAMA, Michio OKAMOTO
Article type: Article
Pages
15-24
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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Measurements have been made in the Mitaka No.2 Ship Experiment Tank of the Ship Research Institute of the water movements induced by various causes and of their influences on model test results. The main concern in this paper is with the longitudinal movement of water.
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Ryo TASAKI, Hiromitsu KITAGAWA, Koichi KOYAMA, Michio OKAMOTO
Article type: Article
Pages
25-32
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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By using a non-dimensional equation of motion, the responses of the blade wheel current meter are calculated to the step, linear and sine changes of current speed. The results elucidate dynamic characteristics of the current meter, which are of use for estimating errors in measurements and designing new one suitable to the purposes of experiments. The errors are also discussed in the case where the speed of rotation of the blade wheel is calculated on the inverse of the time interval for a finite number of rotation.
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Tatsuo ITO, Hiroyuki KADOI, Yoshio KOKUBO, Hiroshi OKAMOTO, Tadao KOND ...
Article type: Article
Pages
33-40
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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This report presents the results of visual observations of cavitation patterns on propellers for a tanker and a high speed cargo ship. Corresponding model tests have been carried out in the cavitation tunnel of the Ship Research Institute. Two kinds of wake distributions have been simulated in the tunnel for each propeller model, one of them being model wake and the other being full scale wake estimated by Sasajima's method (1). The greater stress has been laid on sketching the cavitation patterns and classifying the type of cavitation by visual observation than on photographing.
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Junkichi YAGI, Yukio UEDA, Taketo YAMAKAWA
Article type: Article
Pages
41-46
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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In this series of investigation, various complicated problems have been analysed by the finite element method, such as elastic-plastic stress analysis, plate buckling under various loading and supporting conditions, etc. and new applicability of the method is being developed. In this paper, the non-linear behavior of plate is treated and special attention is paid to its elastic geometrical non-linear behavior of a plate under uniform pressure. For the analysis, the basic non-linear equation is linearized by using the concept of incremental procedure. The developed equation is of linear form with respect to its deformation and is applied at each step of loading. The accumulation of the solution for each increment of loading presents the solution of the problem. In the analysis, shape functions of the finite element should be defined with five degrees of freedom at each nodal point. In this analysis, triangular comforming shape functions for both in-plane and out-of-plane deformations are employed. The results of analysis are compared with analytical solutions obtained by other methods and this method is found to give very accurate solution when the increment of load is taken reasonably small.
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Shichiro KURODA, Noriyuki TAKASUGI
Article type: Article
Pages
47-53
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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The authors analyzed forced oscillation of superposed fluids in a rectangular tank, and present the results such as the velocity potentials, surface elevation, interface elevation, and natural frequency, in this paper. The results provide useful information to determine the dimensions of a open tank by assuming surface or interface motion, to calculate the pressure acting on the tank wall and to estimate the free surface effects on the tank motion, such as the rolling of tanker.
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[in Japanese]
Article type: Article
Pages
54-56
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
57-60
Published: March 30, 1970
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Article type: Appendix
Pages
61-66
Published: March 30, 1970
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Article type: Appendix
Pages
App1-
Published: March 30, 1970
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Article type: Appendix
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Published: March 30, 1970
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Article type: Appendix
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Published: March 30, 1970
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Article type: Appendix
Pages
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Published: March 30, 1970
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Article type: Appendix
Pages
App5-
Published: March 30, 1970
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Article type: Appendix
Pages
App6-
Published: March 30, 1970
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Article type: Cover
Pages
Cover3-
Published: March 30, 1970
Released on J-STAGE: February 25, 2018
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