関西造船協会誌

表紙

原稿種別: 表紙
p. Cover1-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_Cover1

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目次

原稿種別: 表紙
p. Cover2-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_Cover2

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Current Problems in Ship Hydrodynamics

T. Francis Ogilvie

原稿種別: Article
p. 1-17
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_1

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条材の成形加工の自動化に関する研究

荻野泉, 伊豫進, 峯孝志, 山下正勝, 森章次, 千星健一

原稿種別: 本文
p. 19-25
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_19

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In the automatic control system in the cold bending process, it is difficult to determine working variations because of disturbances such as spring back and lap of plastic zones. However, this experiment proved that measuring fulcrum location, the loading point, carrying length, amount of deflection and working pressure makes it possible to calculate working variations accurately. This work programme can be computerised to give accurate and timely procedure.

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工事上からみたダクトプロペラ

上田公知, 富樫邦夫, 筒井正宏, 小林良吉, 山口聡, 浦田俊夫

原稿種別: 本文
p. 27-33
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_27

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Recently there is an increasing tendency that the duct propeller is adopted in large vessels for improvement of the propulsion efficiency. With this tendency, many reports and papers on the propulsion efficiency of the duct propeller have been published. However, there are seen few reports or explantations on the points in the work for adoption of the duct propeller at ship's new building or repairs. We, Kawasaki Heavy Industries, Ltd., adopted the duct propeller in a large vessel first in the world, and have examined various problems attending upon the work and settled them. Among those, we wish to introduce the following four main items: 1. Fitting accuracy of duct 2. Shape and strength of appliance for carrying-in the propeller 3. Process of carrying-in the propeller 4. Drawing procedure of propeller shaft in the dock

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ダクトプロペラ装備船における Air Injection に関する実験的研究

斎藤泰夫, 天野雄二, 松本潔

原稿種別: 本文
p. 35-45
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_35

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From a viewpoint of the improvement in the propulsive efficiency, the feasibility range of the ducted propeller is expected to increase to a great extent. On the other hand, the cavitation erosion on the duct inner surface has turned out to be a more serious problem than expected, and might be a fatal drawback to the ducted propeller without adequate countermeasures. As a solution to this problem, the air injection method has been introduced into practical use. This paper gives the results of experimental investigations into the effectiveness of this newly developed erosion protection method.To investigate the effect of the air injection, the following measurements have been performed on 230,000 DWT tankers in sea trials; 1. Cavitation observation 2. Noise radiated from cavitating propeller 3. Duct panel vibration 4. Hull vibration 5. Effect on ship speed and propeller revolution By these tests it has been proved that the air injection reduces remarkably the intensity of the response to the cavitation attack due to cavity collapse. The tests have also shown that there is no significant effect on the hull vibration and the propulsive performance. In the post-service erosion survey of the ducted propellers, the effectiveness of the air injection has also been confirmed.

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有脚式海洋作業台船の底面洗掘による安定について (第1報)

平野美木, 堀田平

原稿種別: 本文
p. 47-55
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_47

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Following experiments are carried out on the open circulating tank of Tokai University, which has glass wall on the both sides, and fine sand is covered over the bottom of it. We observed scouring phenomenon which generates beneath tee cylindrical leg model supporting by the frame perpendiculally, when uniflow current and wave are provided. We obtain the following results. (1) The scouring phenomenon goes on very speedy for every bottom shape of leg model, when the current velocity is 25 cm/sec. (2) The current velocity when the scouring begins is defined by the diameter. And we obtain the following formular. U=0.144/D^<O.15> where, U: mean current velocity when the scouring begins. (cm/sec.) D: diameter of the leg model. (m) (3) The wave data when the scouring begins is affected by the water depth, wave height and wave period. Following formular is proposed; H/h=0.012/(T√<g/L>-3.3)+0.16 where, H: wave height (m) h: water depth (m) T: wave period (sec.) L: wave length (m) (4) Thin plate brim which has one and half times of leg model's diameter is very efficient for protect of scouring.

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船尾プロフィルが肥大船の進路安定性に及ぼす影響について

多田納久義, 柏谷達男, 竹原正樹

原稿種別: 本文
p. 57-65
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_57

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A statistical study on the correlation between course stability and stern-profile of full form ships, both in full and model scale, led us to the following formula. D=k_1 H_PS+k_2H_RS-k_3 (C_B B/d) where D: 1/K'_O K_0': slope of r'&sim;δ curve at the origin (this is a course stability index) k_l, k_2, k_3: coefficients to be determined by the statistical analysis H_PS, H_RS: stern-profile parameters; cf. Fig. 5 Although the formula consists of only three terms H_PS, H_RS and C_BB/d, the calculated, D values for a number of forms showed a good agreement with the observed ones as is seen in Table 1 and 2. This fact implies that the stern-profiles have an important concern to the course stability; the shallower stern over-hang, the deeper propeller immersion, the wider clearance between stern over-hang and rudder top result apparently in the better stability. This formula will be usefull in ship design for fixing the stern profile and rudder arrangement. This paper also relates to a stern flow survey concerning the effect of stern profile to the course-stability, with a hypothetic interpretation of the result.

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コンテナ船の波浪中推進性能に関する研究 (第5報)

中村彰一, 内藤林, 井上昭

原稿種別: 本文
p. 67-77
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_67

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With a ship model of single screw high speed container ship, self-propulsion tests in regular head waves are carried out. In order to investigate the effect of propeller diameter on the powering characteristics and the propeller load fluctuations in waves, two propellers of different diameter are used. The effects of wave height on the mean increases of thrust, torque and number of revolutions and the load fluctuations of propeller are also investigated. With the same model, self-propulsion tests in regular following waves are carried out, and the experimental results of ship motions are compared with the calculated results. At the same time the mean increases of thrust, torque and number of revolutions and the propeller load fluctuations are measured. Calculation method of surging motion in regular following waves and spectral analysis of encounter waves and ship motions in irregular following waves are discussed. Power predictions in a seaway for a container ship of 175 m length are performed using the results of model experiments by four different methods, that is direct power method, torque and rate of rotation method, thrust method and thrust identity method.

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乱流境界層の縦渦による変形について

鈴木敏夫, 松村清重, 山田賢司

原稿種別: 本文
p. 79-85
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_79

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This paper represents a simplified model of the flow in the boundary layer (B.L.)developing on ships with bilge vortices. The simplified flow model is a combination of the B.L. developing on a flat plate and the trailing vortex produced by the edge of sweptback wing. B.L. suction is applied to reduce the B.L. thickness to half its original value to simulate scale effect. The B.L. deformation due to the vortex effect is calculated assuming that the volocity components normal to the vortex line is due to the potential effect of the vertex and that the stream-wise component is constant on the same stream line. The calculated value are compared with experiments, and the results are summarized as: 1) The simplified flow model creates a similar velocity distribution to that which occurs around the stern of full ships. 2) The calculated velocity patern is similar to the measured one except near the vortex core. 3) The scale effect on the deformed B. L. and the flat plate B.L. is found to be different. This may be attributed to the rolling up of the B.L. and the existance of a secondary vortex which appears above the main one. Such secondary vortex may strongly affects the main vortex lateral position. 4) The asymptotic solution on the trailing vortex by Batchelor is found to be a good approximation to the vorticity diffusion, but its application to the velocity distribution on this flow model is not recommended.

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An Experimental Study of the Turbulent Boundary Layer on the After Body of a Tanker Model

Nabil SEHSAH

原稿種別: Article
p. 87-103
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_87

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The velocity distribution in the turbulent boundary layer developing on the after body of a tanker model is measured in the towing tank. A new pressure type probe called "3-in-1 yaw probe" is used to measure the velocity magnitude and direction. The probe is traversed normal to the model surface using a specially designed traversing equipment with high accuracy. The measured velocity distributions are analysed and compared with Coles vector velocity profile. The integral paramenters calculated from the measured velocity profiles are compared with the results of the recently developed calculations of Himeno & Tanaka. Other characteristics of the three-dimensional boundary layer are also discussed.

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海上と海底を結ぶ流体移送用フレキシブルホースの撓みおよび張力について

三浦敏, 手塚久男

原稿種別: 本文
p. 105-110
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_105

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Fluid-transfer flexible-hose has developed for transferring nitric gas from charging gas equipment on the floating platform to the drilling unit on the sea bed. This fluid-transfer system by flexible-hose is essential to the remote-controllable deep sea oil drilling unit, which has some problems with the use of the system in waves and tides as follows. (1) Tangle between the flexible-hoses and the other cables or tangle of the flexible-hoses themselves. (2) Strength of the flexible-hoses under inner pressure environment. Hose deflection tests and theoretical analyses were made on mechanical properties of the flexible-hose, deflection and tension of the flexible-hose under the external force to solve the above stated problems. As a result of this study, simple equations of maximum defiection and tension were obtained, and in future, will be useful to design the f1exible-hose of the same kind above mentioned.

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0n the Measurement of Wave Induced Vibration on Board

瀬川治朗, 井上浩, 香川洸二, 浜辺安正

原稿種別: Article
p. 111-117
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_111

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Wave induced vibration (springing) has been studied both theoretically and experimentally. The excellent researches have been reported in each field. But only theoretical and experimental studies are not enough to investigate springing. It is necessary to carry out the measurement of springing on board. Especially the measurement on board is very important to get the relation between springing and sea condition. The new type of ship cultivated in Mitsubishi Heavy Industries, Ltd. which is the shallow draft tanker (L/B=5) is a suitable ship to measure springing. Then the long-term measurement from October in 1974 to February in 1975 was carried out. According to the result of measurement, the sea condition which the ship encountered was Beaufault Scale 8 at the most. The upper limit of springing stress (RMS) was about 0.6 kg/mm^2. The average frequency of the hull nodal vibration for the ballast condition was about 36.O cpm. Through the long-term measurement of springing this time, the basic data to investigate springing in relation to sea condition were gained to a certain extent.

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タンカーのタンク・クリーニング近代化について

関西造船協会 , タンク・クリーニング近代化委員会

原稿種別: 本文
p. 119-131
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_119

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〔抄訳〕水槽試験に関するフルード父子の4論文 (その1)

池畑光尚, 早嵜和幸

原稿種別: 本文
p. 133-140
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_133

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会報

原稿種別: 付録等
p. 141-142
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_141

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[OTHERS]

原稿種別: 付録等
p. App1-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_App1

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ALMUTANABBI

原稿種別: 付録等
p. App2-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_App2

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WORLD CONCORD

原稿種別: 付録等
p. App3-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_App3

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裏表紙

原稿種別: 表紙
p. Cover3-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_Cover3

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CONTENTS

原稿種別: 表紙
p. Cover4-
発行日: 1976/09/30
公開日: 2018/03/30

DOIhttps://doi.org/10.14856/kansaiks.162.0_Cover4

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