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Article type: Cover
Pages
Cover1-
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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Article type: Cover
Pages
Cover2-
Published: June 30, 1972
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Tomomichi KURIHARA, Chosuke MAEKAWA, Katsuhiro KANEKO
Article type: Article
Pages
1-10
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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A study, on heat transfer coefficient and effective length of R12 cooling coil, was made and the following new formulas were presented. Some experiments on models and actual ref. chambers were carried out to assess the validity of the following formulas, and it was found that the formulas were agreed approximately with the results of experiments. 1. Heat transfer coefficient of R12 cooling coil i) 10℃≧room temp. >0℃ K=1.74(Δt/d)^0.25+1.96 ii) 0℃≧room temp. ≧-20℃ K=1.59(Δt/d)^0.25+1.53 2. Effective length of R12 cooling coil L=d/2(pfgΔi^2ΔP/(-C_1+0.216C_2+C_3)fωK^2Δt^2)^1/3 Moreover, the following points were confirmed experimentally. 3. The heat transfer coefficient of vertical coil differs little from that of horizontal one. 4. The heat transfer coefficient of coil is not affected by 0∼4mm thickness of frost on the surface of coil.
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Michimasa ENDO, Kimio YOKOTA, Naochika NANBA, Hirofumi SEKIGAWA, Takay ...
Article type: Article
Pages
11-16
Published: June 30, 1972
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This report presents an experimental investigation on the production of larger scale syntactic foam for 6,000m submersible use. The Experiments were carried out to confirm the processes to produce large scale syntactic foam and to ascertain its properties for deep sea applications. At this experiments, it is shown that the syntactic foam of large scale suitable for 6,000m-deep application can be obtained.
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Hiroshi OKAMOTO, Akira TANAKA, Kazuo NOZAWA, Yasuo SAITO
Article type: Article
Pages
17-32
Published: June 30, 1972
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In the previous report 1), 2), the authors discussed the stopping abilities of ships equipped with controllable pitch propeller (CPP), from a viewpoint of both sea trial results and theoretical computation about transient phenomena, by using a one-dimensional equation of ship motion. They described the CPP ship's superiorities in both its easy manoeuvring of astern-going and overa11 stopping abilities. As for the results of theoretical calculation it was found that CPP stopping characteristics can be estimated enough quantitative1y. In this report, the authors describe the fluctuating characteristics of shaft revolution number at CPP crash astern test, by solving simultaneous equations in respect to ship motion and prope11er-shaft revolutional motion. Furthermore, using the about computer program, the authors investigated influence of blade changing time on fluctuation of shaft revolution, CPP blade root strain, etc. It is also very important to investigate on stopping abilities of FPP ships in order to grasp stopping abilities of CPP ships. The authors devide transient phenomena of FPP ships into five ranges and fully examine each of them from actual astern test results. Based on these results, they calculated some transient phenomena of FPP ships with computer program and compare them with actual trial data and make some simulation to find important factors of stopping abilities of FPP ships. Finally they make comparisons of stopping abilities under the same initial condition, between CPP-installed and FPP-installed ships by astern programs for them.
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Yoshifumi TAKAISHI, Taihei YOSHINO, Toshihiko SARUTA
Article type: Article
Pages
33-42
Published: June 30, 1972
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Container ships as a high-speed liner are becoming faster and larger so that the ship form becomes more slender, having more number of propellers. This paper deals with the motions of such vessels in oblique regular waves by means of both model tests in the seakeeping tank and theoretical calculations based on the so-called strip method. The model tests were carried out for two types of ships whose length-breadth ratio (L/B) is eight, having single and twin propellers. The test results are compared with each other as well as with those obtained recently for a container ship whose L/B is 6.89. They are also compared with the computed results by the new strip method which has been recently developed by N.Salvesen and others or F.Tasai. As the result, the effects of L/B on ship motions are clarified. The agreement between experiments and theory are very good for vertical motions in every wave direction and for lateral motions in beam and bow waves, while the difference is rather remarkable for lateral motions in quartering waves.
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Hiroyuki SADAKANE, Toshio HISHIDA
Article type: Article
Pages
43-52
Published: June 30, 1972
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Rolling characteristics of a floating body, such as a ship, a buoy and so on, among waves change considerab1y when wind blows simultaneously. Most conspicuous is the decrease in amplitude. The present report is an attemot to prove the mechanism of change of characteristics that the mutual interaction of wind velocity and rolling linear velocity makes the amplitude decrease and that the slope of the wind moment curve against the heeling angle of a body causes the apparent stability to the rolling of the body.
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Yoshitada YASUE, Yoshiteru SAKAI, Kiyoshi YOSHIZAWA
Article type: Article
Pages
53-58
Published: June 30, 1972
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With the recent growth of the container transportation, container ships have shown a tendency to increase both in ship's size and in speed. In such container ships, it is usual to fit a multi-shaft owing to the limit in engine output, and even if the multi-shaft is adopted, the output per shaft is expected to get large to a considerable degree. In such multi-shaft ships, it is necessary to take account of the influence of deformation or the vibration of the bossing on the shafting. In designing a twin-shaft container ship, we have made an examination of the bossing from an aspect of the vibration. The natural frequency of ship's bossing has been calculated by a transfer matrix method taking account of the shafting, while the accuracy of this method has been checked by a model test. As a result, we have found that the calculated value and the test result of model roughly agree with each other. Furthermore, using this result, we have estimated the natural frequency of the bossing in an actual ship and determined such a form and dimensions of the bossing that the resonance with the exciting force can be avoided.
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Takanori MATSUOKA, Yuko HASEGAWA
Article type: Article
Pages
59-67
Published: June 30, 1972
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There are various kinds of methods to build-up L-type sections as shown in Fig. 1. L2-and L4-type webs are commonly used in ship structures. Especially, L4-type webs are recently used at engine room webs, transverse rings on top side tanks of bulk carriers and deck transverse webs of cargoes etc. bscause of easiness to built. But, the section of L4-type webs are unsymmetrical and thier top sides are left as cut by gas. An experimental investigations into their fatigue strength were made in this paper. The fatigue strength of L4-type webs is compared to that of T-type web which are usually used at webs or girders. The conclusions obtained are as follows: (1) The fatigue strength of L4-type webs is approximately same as that of T-type webs. (2) The effect of gas-cut edges on the fatigue strength of L4-type webs can be estimated from that of the mother plate. (3) The fatigue strength of the welded portion can be estimated from that of the parallel parts with the aid of Neuber's approximate equation. (see equation (4))
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[in Japanese]
Article type: Article
Pages
68-
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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Article type: Article
Pages
68-
Published: June 30, 1972
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[in Japanese]
Article type: Article
Pages
69-74
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
75-83
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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[in Japanese]
Article type: Article
Pages
85-92
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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Article type: Appendix
Pages
93-95
Published: June 30, 1972
Released on J-STAGE: March 30, 2018
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Article type: Bibliography
Pages
Misc1-
Published: June 30, 1972
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Article type: Appendix
Pages
App1-
Published: June 30, 1972
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Article type: Appendix
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App2-
Published: June 30, 1972
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Article type: Appendix
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App3-
Published: June 30, 1972
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Article type: Appendix
Pages
App4-
Published: June 30, 1972
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Article type: Appendix
Pages
App5-
Published: June 30, 1972
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Article type: Appendix
Pages
App6-
Published: June 30, 1972
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Article type: Cover
Pages
Cover3-
Published: June 30, 1972
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