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Article type: Cover
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Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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Article type: Cover
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Published: September 30, 1975
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Akira ABE, Kojiro NISHIYAMA, Hiroyuki TAKAHARA, Toyohiko SAIWAI
Article type: Article
Pages
1-7
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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To expect long period maintenance of protecting steel surface, inorganic zinc silicate coating will become to increase a chance of its application especially to outer hull surface of VLCC and inner tank surface of products carrier. This experiment has an intention of finding suitable application method under the condition of keeping our present application system as much as possible. Model blocks and tanks are adopted as a test substance in the meaning of simulation of actual ship. Surface preparation is made with classified methods and paint coatings of scheduled systems and performance test of each coating film has been carried out for about one year. From the result of this experiment, we clarified the following item. (1) effect of shop primer coating and necessary grade of blasting in secondary preparation. (2) important factors giving influence on film crack. (3) effect of painting interval of overcoating on interlayer adhesion. (4) workability of slurry airless spray equipment developped for painting of inorganic zinc coating. (5) degree of contamination of products in contact with inorganic zinc coating. (6) anticorrosive performance of inorganic zinc coating for immersion into sea water.
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Itsuo KAWAI, Takuo KISHIMOTO, Shoichi OHTANI, Akira SUGIYAMA
Article type: Article
Pages
9-16
Published: September 30, 1975
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Because of recent increasing tendency of refrigerating containers and customer's high specification for refrigerating containers monitoring system, following disadvantages are considered in existing monitoring system which provides one announciator unit for each refrigerating container. 1) The size of monitoring panel is getting bigger as quantity of refrigerating containers increases. 2) A large amount of cables is needed between refrigerating containers and monitoring panel. 3) Price of monitoring system is becoming higher in proportion to refrigerating containers quantity. Therefore the authors have decided to adopt micro processor for monitoring system to make the function more efficient and to satisfy customer's requirements and also have studied to apply multi-data transmission system which was developed two years ago to decrease total cable length onboard. In this paper, summary of new monitoring system and application problems of multi-data transmission system onboard are described.
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Katsuto KANAO, Yasushi SAKAKURA, Masakatsu HAYAMIZU, Rikiya MORI, Kats ...
Article type: Article
Pages
17-25
Published: September 30, 1975
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When we intend to arrange signal transmission circuits in ships, we have usually decided the laying method and kinds of cables depending upon our experiences. It's partly because we have to lay down the cables in the complicated and limited spaces of ships and partly because there has been little literature available and appropriate to there specific conditions up to now. As a result, we have sometimes met with the difficulties of inductive interference. Whenever we met with such difficulties, we could manage them, if not successfully, by taking some partial and/or temporary measures. But these measures can hardly be said to be good ones. And especially, if unarmored cables are to be used in the ships in order to meet the requirement of the present economic situation, in which we are required to reduce the material cost and the amount of labour, we have to take much care to prevent inductive interference. These are the main motives for our taking up the inductive interference as our subject this time, and we have carried out some experiments in order to observe the inductive phenomena caused when unarmored cables are used. From these experiments, we could successfully ponder over the method of using the unarmored cables without suffering the inductive interference. We hope this report will prove to be of good help to all of you.
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Ryo TASAKI, Hiromitsu KITAGAWA, Hiroshi OKAMOTO, Akira TANAKA
Article type: Article
Pages
27-35
Published: September 30, 1975
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Self-propulsion tests in regular head waves are carried out of high speed container models with a single screw propeller at the service and the ballast conditions. Ship motions and accelerations, as well as increases of thrust, torque and revolutions of propeller, are measured. The results of ship motions show a fairly good agreement with those calculated by the "Strip method", except in rather a high speed range. An influence of bow flare and height of knuckle line on shipping water is also discussed.
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Shoichi NAKAMURA, Ryusuke HOSODA, Shigeru NAITO
Article type: Article
Pages
37-46
Published: September 30, 1975
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With a ship model of single screw high speed container ship, resistance and self-propulsion tests in regular head waves are carried out in the Experiment Tank of Osaka University. The experimental results of ship motions and resistance increases in regular head waves are compared with the results obtained from the theoretical calculations. The self-propulsion factors in regular head waves are analysed by assuming that the mean characteristics of a propeller in waves are identical with those in still water. The effects of wave height on ship motions, mean increases of resistance, proppeler thrust, torque and revolution, self-propulsion factors and propeller load fluctuation are investigated. The measured amplitudes of propeller load fluctuation are compared with the values caluculated by using the open water characteristics in still water, taking the axial inflow velocity to the propeller, the wave height reduction of incident wave at the stern and the response of the prime mover into consideration.
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Minoru SAKAO
Article type: Article
Pages
47-73
Published: September 30, 1975
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In this report, the flow around an unsymmetric ducted propeller in the non-uniform wake is calculated theoretically on the basis of the thought similar to the previous paper. The assumptions used here are as follows. (1) The number of propeller blade is infinity. (2) The free vortex is shed out only at the tip of the propeller blade. (3) The induced velocity of the propeller can be approximated by the induced velocity obtained from a quasi-static calculation. (4) The thickness of the nozzle is negligible. By numerical study based on the above theoretical calculations, next points become clear. (1) The velocity of flow relative to the nozzle at its upper part is very small and it is able to suppose that a negative relative velocity arises at that part. (2) The effect to make a flow uniform inside a nozzle becomes large in a ducted propeller having a nozzle of a large nose angle or diffuser angle at the upper part of it. (3) The efficiency of an unsymmetric ducted propeller with a nozzle of large nose or diffuser angle at the upper part of it is better than the efficiency of a symmetric ducted propeller in the non-uniform wake. (4) The thrust of the nozzle in the non-uniform wake is smaller than the thrust in uniform flow of the same mean inflow velocity.
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Minoru SAKAO, Akira MASUMOTO
Article type: Article
Pages
75-83
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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As an application of the equations (2)-(8) which express the flow around a symmetric ducted propeller in the uniform wake and were already reported by one of the authors, an empirical formula expressing thrust and torque of a symmetric ducted propeller in the uniform wake is obtained based on the above stated equations. The procedures used here are as follows. 1) Open tests on seven models of symmetric ducted propellers are carried out at our circulating water channal. 2) Based on the above stated equations, seven sets of geometrical parameters, γP_0, l_0, m_0, n_0, which represent the above seven models of ducted propellers, are obtained by means of the least square method. 3) It is assumed that hydrodynamic parameters, γP_0', l_0', m_0', n'_0, representing a symmetric ducted propeller in the uniform wake are expressed by unknown constants, advance constant of propeller, J, and γP_0, l_0, m_0, n_0 as equation (9). 4) Seven sets of unknown constants in equation (9) are determined by a regression analysis using the equations (1)-(9), seven sets of γP_0, l_0, m_0, n_0 and open test results on seven ducted propeller models. 5) Using seven sets of constants obtained by the above stated method and equations (1)-(9), an empirical formula expressing thrust and torque of a symmetric ducted propeller in the uniform wake is constructed.
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Hiraku TANAKA, Hiroyuki ADACHI, Naoyuki YOKOO, Kiyoshi SHIMADA
Article type: Article
Pages
85-94
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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Particular attentions on the wave pattern resistance of self-propelled ship have been on the increase. Although the wave resistance of screw propellers have been largely studied theoretically, only a few experimental investigations have been reported. The measurement of the waves behind a propeller using the special towing apparatus of propeller in open water, has been performed in the Ship Research Institute. Through the experiment, following subjects are confirmed. 1) The theoretical wave heights of screw propellers represented by sink distribution roughly coincide with the results of measurements. 2) The wave pattern resistance of propeller is proportional to square of the load factor as expected in the theories. 3) The waves behind self-propelled ship models can be roughly treated as the sum of the waves generated by the towed ship and the propeller in open water. 4) It is estimated that the wave resistance of a propeller accounts for about 30 percent of the thrust augmentation.
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Hideo SASAJIMA, Ichiro TANAKA, Michio NAKATO, Toshio SUZUKI, Osamu KIS ...
Article type: Article
Pages
95-102
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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In order to analyse the propulsive performance of ships, it is very much desired to measure the exact value of the thrust as well as that of the torque acting on actual ship propellers. In this paper a new type thrustmeter which measures mechanically enlarged compressive strain using strain gauges is developed and the results of measurements at sea trials are presented. It is shown that this thrustmeter can be used successfully to measure the thrust of ships, provided that the temperature of the thrustmeter and the propeller shaft surface can be measured accurately.
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Wataru KOTERAYAMA, Ichiro TANAKA
Article type: Article
Pages
103-116
Published: September 30, 1975
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In the first report, the authors et al. have made an experimental study on the viscous effect on thrust deduction using two bodies of revolution. In the second report, theoretical attack to the problem has been attempted by solving the Navier-Stokes equation by the finite difference method with the assumption of eddy viscosity and the calculated results have been compared with the experiments. In the present paper, the calculation is made for high Reynolds Number corresponding to actual ships. The scale effect on thrust deduction is studied based on the numerical results and analytical consideration.
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Junkichi YAGI, Ko NISHIMAKI, Youichi HARA, Kohei MATSUMOTO, Tamio KOZO ...
Article type: Article
Pages
117-128
Published: September 30, 1975
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In order to study the dynamic behavior of ship's side shell structures subjected to impulsive wave load, a test equipment was made as a part of research works of Japan Shipbuilding Research Association. Principal features of the equipment are as follows: The maximum dimension of test model is 1.5m square. The maximum pressure is 15kg/cm^2. The height and the diameter of the pressure chamber are about 6m and 2.8m respectively. The equipment is semi-automatically operated by sequence control system. Impulsive pressure patterns can be controled by ajusting factors such as water level, set-up pressure, thickness of rupture discs, rupture time difference of two discs and rigidity of test model.
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Akibumi FUJIWARA, Tadashi SO, Yukio UEDA
Article type: Article
Pages
129-134
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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Finite-element formulation for analysis of creep behavior of beams and columns subject to axial compressive load is presented. Temperature dependency of material properties, i.e., Young's modulus, yield strength, thermal expansion coefficient and creep coefficient, is considered. A new approach is proposed to predict the buckling time, and the results are compared with ones which are obtained by Hoff's idealization.
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[in Japanese]
Article type: Article
Pages
135-141
Published: September 30, 1975
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
143-148
Published: September 30, 1975
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Article type: Appendix
Pages
149-150
Published: September 30, 1975
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Article type: Appendix
Pages
App1-
Published: September 30, 1975
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Article type: Appendix
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Published: September 30, 1975
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Article type: Appendix
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Published: September 30, 1975
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Article type: Appendix
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Published: September 30, 1975
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Article type: Cover
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Published: September 30, 1975
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