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Article type: Cover
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Cover1-
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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Article type: Cover
Pages
Cover2-
Published: December 30, 1969
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Tatumi KURIOKA, Yukihiro NOMAGUCHI
Article type: Article
Pages
1-10
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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Attainment of a high productive efficiency through the modernization of production control is an important matter and shipbuilding companics are actively introducing the use of computers. The authors have established a structure of production management system in their hull steelworks. This paper describes a study on an example of optimization method of a production planning in a real shipyard and outlines a computer program MASS that produces master schedule.
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Kazuo NAKANO, Yasuhiro KUBOTA, Syuji KANDA
Article type: Article
Pages
11-17
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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The collapsing tests have been conducted to investigate the strength of the observation windows for research submarine. The observation windows used in the tests are 90 degrees conical windows, and made of methacrylate plastics. The results of the tests are as follows:- (1) The windows of 30 mm thickness failed generally in flexure, at the pressure of 340∼360 kg/cm^2, while those of 50 mm thickness did not fail at the pressure of 900 kg/cm^2, but yielded plastic deformations. (2) The critical pressure of the windows is given by the following experimental equation: Pcr=5.29(t/D)^2σfcr where, Pcr: critical pressure (kg/cm^2) D: small face diameter of conical windows (mm) t: thickness of windows (mm) σfcr: bending strength of materials (kg/cm^2)
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Hiroo OKADA, Yoshio FUKUMOTO
Article type: Article
Pages
18-22
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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In this paper, the behavior of a plate under increasing compression and constant hydraulic pressure is investigated by means of the energy method. Numerical calculations are performed for a case of the aspect ratio α=2, and it is shown that there are three kinds of typical deformation patterns for such a plate according to the magnitude of hydraulic pressure. And buckling load is also dircussed in such practical cases that there are disturbances and initial distortions.
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Shoichi NAKAMURA, Ryusuke HOSODA, Atsushi SHINTANI
Article type: Article
Pages
23-32
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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With a ship model of a Series 60, C_B=0.70 parent form, resistance and self-propulsion tests, wake measurements at the position of propeller disc in regular head waves and overloaded self-propulsion tests in still water were carried out in the Experiment Tank of Osaka University. From the results of these experiments, the self-propulsion factors in waves were investigated, and it was shown that the self-propulsion factors in waves vary with the wave length, especially with in the range of λ/L〓1.0∼1.5, and are not always identical with those in still water. The experimental results of ship motion and resistance increase in waves were compared with the results obtained from the theoretical computations.
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Kozaburo YAMADA
Article type: Article
Pages
33-41
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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Recently, manoeuvrability of super tankers and specially designed cargo ships is becoming a matter of great concern due to their great size and increase of fullness. In this paper, the author presents some criteria on manoeuvrability and rudder area design for ships, especially greater than 200 m in length. These criteria are based on the summerized results of zig-zag tests and ship's motions during voyage, as well as a Ω∼δ analysis of steady turning characteristics, together with the study of the questionaire presented to navigators aboard such ships. The main results obtained are as follows. (1) Ship's motions in 10° zig-zag test can be taken as the standard of various motions during a voyage. (2) Standard rudder area can be determined by Fig. 11 in view of course stability, and by Fig. 13 from the viewpoint of turning performance. (3) It is recommended to adopt the larger value between Fig. 11 and Fig. 13 as the rudder area whichever is the larger, but it is considered possible to decrease it to the lower limit (Fig. 12 in view of courses tability) under special circumstances. (4) The standard rudder area in this paper is considered to be reasonable judging from the distribution of manoeuvrability characteristics of 120 recently built large ships (Fig. 14 and Fig. 15). The criteria for judgement were the same as presented above by the author.
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Hiroshi OKAMOTO, Hiromasa TAMAI
Article type: Article
Pages
42-53
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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The authors tried to conduct a model test as the first step into the investigations on ship maneuverability with side thrusters. The experiments were performed by maneuvering 6 m L_<pp> liner model with an operator directly on board at Kakogawa Model Test Basin, Kawasaki Heavy Industries, Ltd. Tested items were as follows: (1) Short turning test. (2) Approaching a stern-on berth under sternway. (3) Investigation into effects of ship speed. (4) Turning test by combined operation of rudder and side thrusters. As the results, the followings were obtained. Side thrusters give good effects on ship maneuverability in the delicate maneuvers, such as those in approaching to a berth, or in a restricted water. Ship's forward speed affects appreciably on the performance of side thrusters. Turnability recovers after once falling with increase of speed in the case fitted with the bow thruster, while the reverse turning is possibly daveloped in the case of the stern thruster.
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[in Japanese]
Article type: Article
Pages
55-59
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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[in Japanese]
Article type: Article
Pages
60-65
Published: December 30, 1969
Released on J-STAGE: February 25, 2018
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Article type: Appendix
Pages
66-68
Published: December 30, 1969
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Article type: Appendix
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App1-
Published: December 30, 1969
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Article type: Appendix
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App2-
Published: December 30, 1969
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Article type: Appendix
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App3-
Published: December 30, 1969
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Article type: Appendix
Pages
App4-
Published: December 30, 1969
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Article type: Appendix
Pages
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Published: December 30, 1969
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Article type: Appendix
Pages
App6-
Published: December 30, 1969
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Article type: Cover
Pages
Cover3-
Published: December 30, 1969
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