Journal of the Kansai Society of Naval Architects, Japan
Online ISSN : 2433-104X
Print ISSN : 0389-9101
171
Displaying 1-27 of 27 articles from this issue
  • Article type: Cover
    Pages Cover1-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Article type: Cover
    Pages Cover2-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Article type: Appendix
    Pages App1-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Takanori NAKAMURA
    Article type: Article
    Pages 1-11
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper describes the summary of the study on the character of container ships from the viewpoint of economy and structural strength based on the actual data of container ships that were taken through the course of the progress of ships. (These data were produced mainly by Mitsubishi Kobe Shipyard with which the author was engaged till recently.) The development of container ships can be observed on two causes; "External factor" and "Internal factor". "High speed" and "Large size". These can be regarded as the natural characteristics of container ships, which conventional cargo liners could not satisfy. Such demand of economics should be called "External factor of development". Another cause called "Internal factor" means "container loading on deck" and "wide and long hatches". These were attained by container ships. It was verified that expected effects on carrying capacity were proven by these characters, by application of various engineering parameters and calculation of economy of ships operation. Existence of these characters was also proven by principal component analysis. Furthermore, container ships have the character on structural design that their principal dimensions are determined in accordance with number of containers stored in holds. The way to future progress of container ships should be considered to utilize further these characters. And, development of total hull girder system in the field of structural design and so called flexible bossings for good performance in the field of resistance and propulsion should be expected. For guidance the word "container ships" appears in this paper is understood to be "lift on lift off type".
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  • Yoshifumi TAKAISHI, Masayoshi HIRANO, Toshihiko SARUTA, Junshi TAKASHI ...
    Article type: Article
    Pages 13-21
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    It is a well-known fact for a fine vessel such as a container carrier that a problem often arises for her rolling motion when she advances in quartering sea with high speed. In order to overcome this problem for rolling motion, many fine and high speed vessels recently adopt fin stabilizer system as a roll reduction device. The authors recently had a chance to investigate sea-keeping quality of a roll on/roll off vessel. In connection with this investigation, an attempt to study the effect of fin stabilizer to rolling motion was made. Model experiments to control rolling motion by fin stabillizer were carried out both in regular and irregular waves for various kinds of combination of ship advance speed and wave condition, and similar experiments to control rolling motion by rudder were carried out in addition. Theoretical approach with so-called strip method was also made by considering forces of fins or rudders to roll equation. In this report the results of both experimental and theoretical study for the effect of fin stabilizer or rudder to rolling motion are described. The results obtained in this study are summarized as follows. 1) The effect of fin stabilizer to roll reduction is assured to be remarkably large both in regular and irregular waves. 2) For fin stabilizer control system, both proportional and rate control are very effective. But the rate control is considered to be normally the best choice, because the roll reduction by rate control may generally be larger than that by proportional control, and because proportional control causes the natural period of rolling shorter, which is not desirable. 3) The computed results by the method proposed here are in a good agreement with the experimental results. Therefore the calculation method described in this report would be useful for estimation of the effect of fin stabilizer. 4) The use of rudder to roll reduction are found to be effective, but at the same time large yawing motion caused by rudder are found in our experiments. It seem that there exist some problems to be solved in the roll reduction by rudder.
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  • Norihiro MATSUMOTO, Keiji SUEMITSU, Hiroo IKEMATSU
    Article type: Article
    Pages 23-31
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    Connecting devices of pusher barge systems are classified into two types. One is perfectly rigid type for relative motions between a barge and a pusher, and the other is partially free type. The connecting device of this paper is a latter type, and being free for pitching, heaving, rolling and yawing. So, the peculiar control method is needed, by which the pusher barge system is manoeuvred for an optional direction, on the other hand, growth of the cross angle between pusher's and barge's center lines must be restrained. Free running tests were held to get turning characteristics and frequency response characteristics which are necessary to design the peculiar controller. Then it has been proved that the pusher barge system of this type can be controlled, but under way of turning motion, yaw rate of the barge grow rapidly with some rudder angle. In order to make the strange phenomenon clear, hydrodynamic forces and moments of a pusher and a barge were measured at the circulating water channel, and with the results, the motions of this system were simulated. Consequently, it has been made clear that the cause of the phenomenon is the nonlinear force and moment which appears over some drift angle at the point of skegs.
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  • Yoshiho IKEDA, Toshihiro FUJIWARA, Yoji HIMENO, Norio TANAKA
    Article type: Article
    Pages 33-45
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    The unsteady flow velocity near the hull of two dimensional cylinders in roll motion is measured using a hot wire anemometer. The measured values are found to be in good agreement with the theoretical ones which are expressed as a composite form of the solutions of the inner viscous flow and the outer potential flow. And the comparison between the theoretical skin friction and the experimental one deduced from the measured velocity gradient also shows an agreement in case of the cylinder of a midship section. Applying the theory to the ordinary three dimensional ship form, the frictional damping is evaluated, the value of which is almost the same to that of Kato's formula. In addition, from the measurements of the velocity profile for cylinders with small bilge radius, it is found that the size of the separation bubble is unexpectedly small but that the velocity just outside of the bubble is considerably large. The eddy making component of the roll damping obtained from the measured velocity is in approximete agreement with the experimental ones.
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  • Hiroshi ISSHIKI
    Article type: Article
    Pages 47-55
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    There exists various mechanical relations associated with motions of a floating body in waves, and these relations have great value, because they help us to understand water wave phenomena. In this paper, reciprocity and energy relations between diffraction and radiation of a wave by a floating body are discussed from a new and systematic point of view. As an example, there exists the Haskind theorem, which relates the amplitude of the wave excitation force to that of the radiated wave (⇾eq. (14)). When the body is freely floating in a wave, the similar theorem can be derived by considering the equation of the motion of the body as well as the equation of the fluid motion. In this case, the amplitude of the displacement of the body is proportional to that of the radiated wave (⇾eq. (19)). The external damping does not affect the reciprocity relations, but energy relations for freely floating body must include a term, which represents the energy dissipation due to the external damping. The further results such as the Bessho theorem between diffraction and radiation potentials will be presented in near future.
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  • Norihiro MATSUMOTO, Osamu YAMAMOTO, Norihisa KODAN, Takashi MATSUURA, ...
    Article type: Article
    Pages 57-70
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    The ship model basin of NKK was completed in November 1977. It's principal dimension is 240m×l8m×8m. The main and auxiliary carriages are installed on the tank. The former moves longitudinally and the Y-Z carriage suspended from the latter moves transversely and rotates about the vertical axis. The laboratory automation was developed for this basin, its application brought about the following effects: (1) Improve a degree of accuracy for repeating tests. (2) Increase an efficiency of test process due to rapid judgement. (3) Enlarge a possibility of processing for a great number of data. (4) Decrease a number of operators for testing. (5) Simplify the use of data base of test results for ship designing application. In this report, problems about the application of laboratory automation technique and elements of the testing system, i.e., the software and the hardware, are mentioned. Finally, several examples of the test results are also shown.
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  • Hiroyuki ADACHI, Nobuo SUGAI
    Article type: Article
    Pages 71-80
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    For many years much efforts have been devoted to the theoretical prediction of the self-propulsion factors such as thrust deduction and wake and so forth. And the more sophisticated the propeller model is, the more accurately the prediction becomes for the thrust deduction. However only a little attempts have been done for comparing the theoretical prediction with the experiments based on changing the load condition amply. Such experiments are important because theories are described by the load condition which is one of the measure of propeller in operation. In this paper such comparison is made for four models, two full ships and two liners, in order to check the theoretical prediction qualitatively in which propeller is expressed by a distribution of semi-infinite tube of ring vortex. And, moreover, the wave making due to propeller also is taken into account.
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  • Chong Dal OH, Ichiro TANAKA, Tetsuji BABA, Ming Chuan LING
    Article type: Article
    Pages 81-88
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
    CONFERENCE PROCEEDINGS FREE ACCESS
    There exist the bow and stern bilge vortices as well as the counter-rotating stern vortices around the full ship, which are all closely connected with resistance and propulsion of the ship. In this paper numerical calculations of the motion of the bow bilge vortex and the circulations of the bow and stern bilge vortices are carried out. The locus of the vortex center is calculated by applying the two-dimensional line vortex approximation and the conformal mapping method. The circulations of vortices are obtained by integrating the pressure differences at the both ends of the boundary layer involved into the separation vortices. The calculated values agree with the measured values with acceptable accuracy.
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  • Article type: Index
    Pages 89-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese]
    Article type: Article
    Pages 90-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese]
    Article type: Article
    Pages 91-101
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    Pages 103-110
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese]
    Article type: Article
    Pages 111-113
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese], [in Japanese]
    Article type: Article
    Pages 115-120
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese]
    Article type: Article
    Pages 121-128
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • [in Japanese]
    Article type: Article
    Pages 129-133
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages 135-137
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages App2-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages App3-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages App4-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages App5-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Appendix
    Pages App6-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Cover
    Pages Cover3-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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  • Article type: Cover
    Pages Cover4-
    Published: December 30, 1978
    Released on J-STAGE: March 30, 2018
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