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Article type: Cover
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Cover1-
Published: March 30, 1972
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Article type: Cover
Pages
Cover2-
Published: March 30, 1972
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Article type: Appendix
Pages
1-3
Published: March 30, 1972
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[in Japanese]
Article type: Article
Pages
4-6
Published: March 30, 1972
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Masaru IKEDA
Article type: Article
Pages
7-16
Published: March 30, 1972
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As a series of studies on small harbour crafts, the data on high speed crafts are presented in this paper.
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Michimasa ENDO, Kimio YOKOTA, Naochika NANBA, Hirofumi SEKIGAWA, Takao ...
Article type: Article
Pages
17-24
Published: March 30, 1972
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The necessities of high strength, low density buoyancy material for deep submergence vehicles were discussed in the preceding report and the superiorities of syntactic foam were shown by comparing with the other candidates. In this report, the relation between the properties of various fillers and resin matrix and the major factors to be controlled to obtain homogeneous syntactic foam are discussed. As the results, it becomes clear that high strength glass sphere of B-35D type is required for 6,000m submersible use when the standard type epoxy resin is used and that it is most important to establish the casting procedure preventing the mixing of air bubbles in foam. The prospect to utilize higher strength epoxy resin is also investigated and the difficulties to control exothermal reaction in casting large scale syntactic foam are made clear.
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Hiroshi OKAMURA
Article type: Article
Pages
25-36
Published: March 30, 1972
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A huge factory is ventilated with monitor roof, lots of roof fans, and/or natural ventilation. Welding shops at shipyard for construction of huge vessels are also conventionary ventilated. However, emitted enormous volume of fume during welding, the shop is poorly ventilated. In this report, some new approaches are developed on the idea of parallel ventilation current and effective exhaust: welding fume is traped in parallel ventilation current of the least air swirl as possible which is caused by ventilation facilities, and escorted to exhaust electric fans which are equipped on the wall of lower reaches of the current. One of the materializations of the idea is the upward ventilation current. Fresh air is supplied through many holes on holed welding floor to grow into parallel ventilation current which tend to roof, and welding fume is trapped in the current to roof ventilators without diffusion. This is effective because welding fume has the initial upward velocity, and found successful in Sakai Shipyard of this company. Another is the horizontal ventilation current. Air is accelerated by many electric fans at the regular intervals to grow into horizontal current which has enough velocity to able to catch welding fume running away upward. Hence, the current should have more velocity than the former because the direction of the current is perpendicular to that of fume. Performance and arrangement of electric fans might be designed using the velocity distribution and equi-velocity lines of the jet from electric fans which is calculated in the report.
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Akikazu NAKAMURA, Atsunao NAMBA, Yoshiteru SAKAI, Mikihiko NAKAYAMA, T ...
Article type: Article
Pages
37-42
Published: March 30, 1972
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We have recently come to recognize that there is a possibility of very severe stress condition of the transverse webs in the top side tanks, through the experience in damages caused at the said parts of the two O. B. O. carriers which were built in our yard about three years ago. Attaching importance to the damages, we measured stresses at the top side tank of the similar ship which was going to be delivered, and made structural analysis as well, to make clear the cause of the damages. As a result of such measurement and calculation, we found that the calculated stresses were almost equal to the actually measured ones. Further, we also made calculation on the damaged ships and could conclude that the cause of the damages would be the high stress caused at the damaged parts when the ship heavily heels and the stress corrosion of the members caused thereby.
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Toshihiko HUNAKI, Taku KOUNO, Masaru KISHINO, Takao YAMAMOTO
Article type: Article
Pages
43-50
Published: March 30, 1972
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In recent year, the high-speed electronic computer has remarkably advanced. The Finite Element Method (F. E. M.) is often applied to analysis of strength of ship hull structures. In the F. E. M. analysis, finer division of finite elements usually is better in accuracy. But in a large structure like a ship hull, the number of the elements become enormous. In this paper, we used comparatively large elements for analysis of a large sized structure like a double bottom in order to save the running time of computer and the results are discussed with respect to accuracy.
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Hiroo OKADA, Yoshio FUKUMOTO
Article type: Article
Pages
51-58
Published: March 30, 1972
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In this paper, the behavior of a plate is investigated under increasing compression and constant inclined hydraulic pressure by means of the energy method shown in our previous paper. Numerical calculations are performed for a case of the aspect ratio α=2, and it is seen that in the case of inclined hydraulic pressure there is no bifurcation in equilibrium states, but there are three kinds of typical deformation patterns for such a plate according to the magnitude of hydraulic pressure in the same manner as the case of uniform hydraulic pressure. And buckling load is also discussed in such practical cases that there are disturbances.
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Toshiaki MIZUNO, Katsuhide SHIMOYAMA
Article type: Article
Pages
59-66
Published: March 30, 1972
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Resistance tests are carried out on several submerged doubld models to investigate the effect of secondary flow on their form resistance. One of the models, the parent form model, has similar sectional form to SR 41 model and the others have Lewis form section so chosen by Bessho's theory that the energy of secondary flow around the model section, T_2, is minimum on the condition of flat keel line and T_2 is zero when there is no condition on keel line. The result shows that the form factor of the model of which T_2 is minimum is less than that of the parent form model and is the least of which T_2 is zero, as Bessho suggested.
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Mitsuhisa IKEHATA, Kiyoyoshi OHASHI, Misato TANAKA
Article type: Article
Pages
67-73
Published: March 30, 1972
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It has been realized that the spectrum of measured wave profile along a longitudinal cut and the wave-making resistance estimated from them are considerably dependent on the distance between the course of the ship and the longitudinal cut. This fact differs from the conclusion of the linearized theory of wave-making resistance of ships, and has been thought caused by the defect of the correction of the truncation of reflected waves on side walls or by the effect of local wave on the longitudinal cut. But, the conclusions of recent investigations on these fields are not enongh to explain the difference of the results on the cuts of different distance. The authors thought that the application of the linearized theory of wave-making as it is to real wave patterns created by the ship or by the model may be the main reason of this defect of wave analysis. Then, starting from two dimensional Fourier analysis, the two dimensional wave spectrum can be estimated from the measured wave pattern. And, when one investigates this two dimensional spectrum of the real wave pattern comparing to one dimensional spectra derived from the ordinary longitudinal cut method and to properties of the theoretical ship wave system based on the linearized theory, the characteristics of the actual wave pattern generated by ships may be distinctly grasped and the above mentioned defect of the ordinary longitudinal cut method 〓 wave analysis must be improved. Considering thus, the authors deduced the theory of wave analysis based on two dimensional wave spectra and applied it to the wave profiles of 2m Wigley model measured on six longitudinal cuts in the towing tank. The results showed that two dimensional spectra of real wave patterns are remarkably different from the spectra of the linearized theory.
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[in Japanese]
Article type: Article
Pages
74-
Published: March 30, 1972
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[in Japanese]
Article type: Article
Pages
74-
Published: March 30, 1972
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[in Japanese]
Article type: Article
Pages
74-
Published: March 30, 1972
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[in Japanese]
Article type: Article
Pages
75-80
Published: March 30, 1972
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[in Japanese], [in Japanese]
Article type: Article
Pages
81-98
Published: March 30, 1972
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Article type: Appendix
Pages
99-111
Published: March 30, 1972
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Article type: Appendix
Pages
112-116
Published: March 30, 1972
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Article type: Appendix
Pages
App1-
Published: March 30, 1972
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Article type: Appendix
Pages
App2-
Published: March 30, 1972
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Article type: Appendix
Pages
App3-
Published: March 30, 1972
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Article type: Appendix
Pages
App4-
Published: March 30, 1972
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Article type: Cover
Pages
Cover3-
Published: March 30, 1972
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