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Article type: Cover
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Published: September 30, 1977
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Article type: Cover
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Kunio MARUYAMA, Seishi ICHIKAWA, Makio MARUYAMA, Takahumi OKADA, Michi ...
Article type: Article
Pages
1-9
Published: September 30, 1977
Released on J-STAGE: March 30, 2018
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In the latter part of the piping work, it becomes necessary to produce model pipes in order to effect adjustments to voriant factors, such as making measurement adjustments to suit the hull structure and various equipments and absorbing pluses and minuses in sizes caused in the process of drawing, production, and installment. Production of model pipes in such a way, however, has the big demerit of longer production time and cost compared to general production of pipes. At Tus Shipyard, our efforts for improvement started in the direction of reducing the labor needed to make pipes necessitate process of model, which resulted in the birth of "Model pipe's dimension analyse & reemergence unit" and related software. We then proceeded to develop, in order to do away with the production and transportation of model pipes, a "three-dimentional coordinate reading instrument (measuring instrument)" and the general system. The appearance in the marketplace of a measuring machine in the meantime facilitated the complection of our system. There is room more improvement, and we hope that you will let us know of any suggestious for improvement on our system after reading the following.
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Minoru MORI, Motoaki YANASE, Seiji TERADA, Hiroshi DOI, Shun-ichi SANO ...
Article type: Article
Pages
11-16
Published: September 30, 1977
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Three types of antifouling paints with the different mechanism of release of antifoulant were tested. The test panels were immersed on a test raft moored off the Bay of Yura, Japan and periodical assessments were carried out. After two years' exposure, the following results were obtained by means of visual analysis and electron probe microanalysis (EPMA): (1) Conventional Type ; Polyvinyl Chloride Paint containing Cu_2O The amount of Cu_2O antifoulant decreased from the surface of coatings and the test panels were attachment of marine plants and animals. (2) Smooth Frictional Type ; Chlorinated Rubber Paint containing Cu_2O The decrease of Cu_2O antifoulant from film was small and due to little dissolution of antifoulant, the test panels were attachment of marine plants and animals. (3) Self Polishing Type ; Organotin Acryl Copolymer Paint The test panels were not attachment of marine plants and animals because the active surfaces were revealed constantly by the self polishing mechanism. In addition, the antifoulant remained uniform over the film. The results show that EPMA is one of the promising methods in order to clarify the relationship between the leaching behavior of antifoulant and the performance of antifouling.
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Hiroyuki SADAKANE, Shuuichi GESHI, Mitsukiyo HATATE
Article type: Article
Pages
17-24
Published: September 30, 1977
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To study the self-excited rolling motion of floating bodies in a steady wind, measurements of static and dynamic wind pressure on the surface of a model are carried out for two models. The influences of rolling period and amplitude on dynamic pressure are also examined. From these experiments, it is concluded that the behaviors of dynamic pressure on the horizontal surface of a superstructure and a deck cause the self-excited rolling and ones on the vertical surface of models have usually the effect of damping moment. Some discussions using a quasi-static analysis to explain the behaviors of the dynamic pressure are made.
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Shoichi NAKAMURA, Shigeru NAITO
Article type: Article
Pages
25-34
Published: September 30, 1977
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Nominal speed loss of a ship in a seaway is caused by the added resistance due to waves and wind. It is well known that the amount of nominal speed loss is influenced by the main engine characteristics. Therefore, the prediction method of nominal speed loss and the corresponding propeller load fluctuations in waves taking account of the main engine characteristics is studied. Self-propulsion tests in regular and irregular waves and overloaded self-propulsion tests in still water with a model of single screw high speed container ship are carried out by use of the engine simulated self-propulsion apparatus to confirm the validity of the prediction method. Fairly good agreement between the measured values and the calculated ones is observed.
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Toshio SUZUKI
Article type: Article
Pages
35-42
Published: September 30, 1977
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Velocity distributions of a three dimensional turbulent boundary layer, which is a combination of the boundary layer (b.1.) developing on the flat plate and the trailing vortex produced by the swept back wing, are measured. Introducing the induced velocity of the trailing vortex and turbulent eddy viscosity, the b.1. deformation due to the trailing vortex is calculated numerically and is compared with experiments. The results are summarized as : 1) Measured velocity distributions of cross flow components are similar to that of induced velocities by the trailing vortex except the narrow region close to the wall. 2) Calculated velocity distribution of the main flow component is in good agreement to the measured one, and the decrease in velocity in the vortex core is observed. 3) Calculated solution on cross flow velocity components using the finite difference method diverged at the upper part of the vortex core, and the three dimensional b.1. separation line is observed on the plate close to that position.
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Chong Dal OH
Article type: Article
Pages
43-51
Published: September 30, 1977
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The vector components of the three-dimensional flow velocity are measured in the towing tank using two five-hole pitot tubes, to investigate the nature of the viscous flow field around a full ship model. The velocities are measured at Sq. Sts. 9, 7, 5 and 3. The results of the measurements are checked qualitatively and quantitatively in detail and it is found that the velocities can be measured with good accuracy even in the thin boundary layer. The numerical calculations of the boundary layer are also carried out using Himeno & Tanaka's method and Okuno's method and compared with the results of the measurements to examine the reliability of these theories.
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Hiroshi ISSHIKI
Article type: Article
Pages
53-58
Published: September 30, 1977
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A variational principle for water wave problem was proposed by Luke. The functional of this principle is the volume integral of the pressure, and the velocity potential, which satisfies the equation of continuity and the equations of the free surface, is distinguished by the stationary condition of this functional. In the present paper, the theory is developed on the basis of Hamilton's principle. The irrotationality of the flow and the mechanical condition of the free surface are the Euler equation of the Hamilton principle. A Legendre transformation of the variables leads to a Luke-type variational principle.
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Hiroshi ISSHIKI
Article type: Article
Pages
59-65
Published: September 30, 1977
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Expressions of the velocity potential of a source in a rectangular canal are obtained, in a more refined manner than the previous paper, based on the expressions of Dirac's δ function. This method of solution may in general be possible when the solution of the differential equation satisfying the boundary conditions can be obtained by the separations of variables. The result is coincident with that derived from the mirror image method. Some singular integrals are interpreted physically from the viewpoint of the theory of the generalized function.
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Seiichi IMAI, Yoshiji NAKAGAWA, Yasushi YOSHIDA
Article type: Article
Pages
67-73
Published: September 30, 1977
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The acoustic emission technique is an effective researching method to explain the deformation and fracture mechanisms of materials. To make clear the relationship between the strength and acoustic emission characteristics, as one of fundamental studies, acoustic emission behavior of some aluminium alloys in deformation process during tensile testing is observed. Obtained results are as follows: i) Two types of acoustic emission tendencies are observed in tested materials, namely, one of them showed an emission peak with the start of plastic deformation, and the others, during deformation flow. The former corresponds to work-hardening type alloy, and the latter, age-hardening type alloys. ii) Analizing the experimental data by a statistic method, acoustic emission pattern recognition of each alloy is attained. iii) The coefficients of the experimental formula connecting with acoustic emission number based on Gilman's dislocation theory are calculated.
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[in Japanese]
Article type: Article
Pages
75-89
Published: September 30, 1977
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[in Japanese], [in Japanese]
Article type: Article
Pages
91-96
Published: September 30, 1977
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Article type: Appendix
Pages
97-98
Published: September 30, 1977
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Article type: Appendix
Pages
99-100
Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Appendix
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Published: September 30, 1977
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Article type: Cover
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Published: September 30, 1977
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Article type: Cover
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Published: September 30, 1977
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