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Article type: Cover
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Published: December 30, 1979
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Article type: Cover
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Seiichi ASANO, Tatsuo TSUDA, Motomu TOYA, Kazuhiko OGAWA
Article type: Article
Pages
1-9
Published: December 30, 1979
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In resistance tests of full ship models, the values of model resistance sometimes become inconsistent at low Froude numbers, and it becomes difficult to determine the form factors out of the resistance curves at the low Froude numbers. The reason of this inconsistency was supposed to be due to the fact that laminar boundary layers were apt to be sustained beyond the turbulence stimulators of the routine process at the Akashi Ship Model Basin. Iterative resistance tests were carried out with full ship models fitted with four kinds of turbulence stimulators shown in Fig.1. Flow visualization tests by means of dye injection and turbulence measurements with a flash type hot-film probe were employed to examine the effects of the various stimulators. The results of the investigations are summarized as follows : (1) The routine stimulator at ASMB was found insufficient for turbulence stimulation particularly with full ship models. (2) No.3 stud condition shown in Fig.1 has been found the most superior because of having a sufficient effect for stimulation and less additional resistance than No.2 stud condition.
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Shigeru YAMAMOTO, Matao TAKAGI, Masaaki KUROI
Article type: Article
Pages
11-22
Published: December 30, 1979
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In this paper, we deal with the statistical estimation of the rolling motion with non-linear roll damping in irregular waves. The term which is proportional to the square of the roll angular velocity, namely B_2 φ^^・∣φ^^・∣ is considered as non-linear roll damping. We take some approximate methods to obtain the statistical data of non-linear roll motions. In some methods, we use two kinds of equivalent linearlized roll damping instead of non-linear roll damping, and the calculations are carried out linearly. In other method, the time histories of rolling motion are obtained by numerically solving the equations with non-linear roll damping term, and we can get the statistical data to analyze the time histories. Using these methods, we calculated some examples in the case of a container ship, and discuss the effects of the difference among roll damping terms from the statistical point of view.
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Hisayoshi TATANO, Takashi KANEDA, Shunpei KONO
Article type: Article
Pages
23-29
Published: December 30, 1979
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In the first report published in 1978, a procedure to predict sailing characteristics was proposed. In this paper, the procedure was applied on an International Flying Fifteen class keel racer. The full-scale trial result was compared with the performance prediction.
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Taroh OKAMOTO, Masahiro TOYOSADA
Article type: Article
Pages
31-41
Published: December 30, 1979
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Tank corner members of semi-membrane or prismatic independent tanks are one of the most important structural members of LPG carriers. As most tank corner members are furnished with brackets, fatigue crack initiation at a bracket end weld toe and propagation along the bead toe are throughly investigated in the paper. Two types of loading patterns were employed in fatigue tests ; 1) Constant amplitude loading and 2) random loading which simulated actual load exerted upon the tanks of LPG carriers. It was confirmed through the experiment that fatigue crack initiated at a bracket end weld toe and propagated along the bead toe. In the paper, the authers presented a method of analysing the fatigue strength of the weld joint between tank corner member and the bracket. In the analysis, stress categories were classified and the effect of structural discontinuity due to the bracket and stress concentration due to weld bead were fully taken into account.
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Kohei MATSUMOTO, Mitsuru MIZUUCHI, Toshimasa SAITOH, Akira ANDOH
Article type: Article
Pages
43-52
Published: December 30, 1979
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A number of roll on-roll off ships recently have been built. These ships have propeller shafting supported with bossing and resonance frequencies of the propeller shafting-bossing system tend to decrease. Therefore one has to be aware of the fact that resonance frequencies can fall within the operating range of the shaft RPM. This paper deals with the calculation method of coupled vibration of propeller shafting and bossing and the method is applied to a roll on-roll off ship. Results of the calculation and those of the measurements show an acceptable agreement.
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Kozo ASANO, Kiyoshi KONDO, Masatsugu TOYOFUKU, Shinichi SUGITA
Article type: Article
Pages
53-61
Published: December 30, 1979
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Many structural members of a ship hull are immersed in water or other kinds of liquid. The effect of such liquid on the free vibration of plates has been investigated by some people. Most bulkheads and walls of a ship hull are consist of stiffened plates, and it is very important to study how the stiffeners effect on the vibration of plates with such liquid-immersed condition. We developed a computer program for the vibration analysis of rectangular stiffened plates immersed in water. The analysis method is based on direct energy minimization theory by means of nonlinear programming. Besides, we adopted "projection method" to solve higher order vibration problems, and this method proved to be very useful. The calculated results showed good agreements with experimental results. In this paper we mainly confined ourselves to the descriptions of the analytical method and the comparison between calculated and experimental results. In the next paper, we will report on the estimation of virtual mass of stiffened plates vibrating in water.
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[in Japanese]
Article type: Article
Pages
63-74
Published: December 30, 1979
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[in Japanese], [in Japanese]
Article type: Article
Pages
75-80
Published: December 30, 1979
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[in Japanese]
Article type: Article
Pages
81-85
Published: December 30, 1979
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[in Japanese]
Article type: Article
Pages
87-91
Published: December 30, 1979
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Article type: Appendix
Pages
93-95
Published: December 30, 1979
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Article type: Appendix
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Published: December 30, 1979
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Article type: Cover
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Published: December 30, 1979
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Article type: Cover
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Published: December 30, 1979
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