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Article type: Cover
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Published: March 30, 1976
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Article type: Cover
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Published: March 30, 1976
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Article type: Appendix
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Published: March 30, 1976
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Akira KOMATSU, Kumio FUKUI, Toshio NISHITANI, Osamu YOKOZEKI
Article type: Article
Pages
1-6
Published: March 30, 1976
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With the recent tendency toward large sized tankers, the increased height of the cargo pump room on such tankers, sometimes close upon 30 meters or more, has compelled the crew to spend much labour for going up and down themselves or carrying machinery parts, and has consequently aroused the demands for the provision of an elevator in the pump room. The compartment, however, is a gas-dangerous space where the existing electric elevator as used in engine rooms cannot be applied as it is, and the fact has delayed the development of practical elevators for the pump room. Under such circumstances, an electric elevator of which hoisting machine and electric control equipment are installed in an isolated gastight room and remote-controlled from the cage by pulling wire ropes, has been developed. However even this type of elevator has still many problems such as the limitation of arrangement unreliability in control, gastightness at the penetration part of wire ropes, etc. For solving those problems, the authors have developed an oil hydraulic elevator for cargo pump room, which is driven by oil hydraulic power and controlled by a combined hydraulic and pneumatic system, and succeeded to achieve a good result on an 300,000 DWT tanker. This paper introduces the summary.
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Tamaji IKEDA, Tosiaki TAGAWA, Tateo NISHIMOTO, Yozo SHIBATA, Fumio OTA ...
Article type: Article
Pages
7-13
Published: March 30, 1976
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The submersible vehicle propulsion motor and the controller, which are installed at the outside of pressure hull, are required to be of small size, light weight and good response. The variable speed, squirrel cage induction motor drived with the current-type inverter has been developed. The motor is filled with oil and pressure-compensated to allow for changes in oil volume with external water pressure. Rated speed of the motor is about 3000 rpm under a 11 kw propeller load. The current-type inverter is installed in the spherical pressure hull.
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Shin-ichi TOMITA, Saburo TODA, Morihiko INOKUMA, Shizuo NINOMIYA, Taka ...
Article type: Article
Pages
15-24
Published: March 30, 1976
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This underwater manipulator is designed to be applied to the submersible vehicle which is subjected to many kinds of maintenance tasks of an oilwell-equipment in the deep sea. All joint motions of the manipulator, having three arms with seven degrees of freedom and an exchangeable terminal device, are powered with hydraulic actuators. A pair of these articulated manipulators are planned to be equipped to the vehicle and to provide a lift capability of 30 kg each at an outreach of two meters from the shoulder pivot. The most significant point of this manipulator system is the adoption of the master-slave control device using position-servo control system, so that the operator can control the manipulator freely and speedily by moving the position and orientation of the grip of a multi-joint control lever, i.e., a miniature of the manipulator.
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Jongsam KIM
Article type: Article
Pages
25-30
Published: March 30, 1976
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This paper treats of a phase-plane analysis on the zig-zag test of a ship with asymmetrical steady turning characteristics. Asymmetry in steady turning characteristics of a ship results in an asymmetrical phase-plane trajectory of zig-zag manouvre. Dividing this asymmetrical trajectory into two parts for positive and negative ψ region, the author has obtained a set of turning characteristic indices K and α. The indices thus obtained can interpret the assymetrical reverse spiral test results fairly well. The mathematical model employed is represented by the rudder-to-yaw response equation with a cubic-type non-linearity, i.e. T_1T_2/Kψ+T_1T_2/Kψ+1/Kψ+α/Kψ^3=δ+T_3δ
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Mikihiro KOBAYASHI, Toshitsugu HIRAYAMA, Hiroko SAKIMOTO
Article type: Article
Pages
31-39
Published: March 30, 1976
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The authors try to develop an optimum design program by SUMT for the hold part construction of a bulk carrier. The program is so designed that user can apply to the practical design work in the initial stage. Some example calculations are carried out by the program. In this program the object of the optimization is the structure of a pair of loaded and empty hold, and the object function means mainly building cost per unit length including material cost, labour cost, and hatch cover production cost, but it can be easily changed to the steel weight by changing some of the input data. The program has 42 variables including dimensions presenting sectional form of the hold, scantlings of frames or longitudinals and thickness of plates. Users can easily specify arbitrary fixed values for any variables by the input data control, so that the confirmation calculations for the practical designs can easily be carried out. The program involves 87 design conditions represented by inequalities relating to the hold capacity, longitudinal strength, double bottom strength, hold frame strength and the local requirements by the NV rule. Zangwill's method is used for searching the minimum direction of the modified object function, and Fibonacci search is used to find out minimum point of the function towards given direction. Through this study the authors have reached the conclusion that in general SUMT is useful for this kind of design program especially including direct calculation even though there are still some problems. In the calculations about 70,000 t bulk carrier two kinds of optimum solutions are obtained, one of them is very close to the actual ship, and the other is very far from it and has some problems from the view point of the actual design.
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Katsuyuki TOMIYOSHI, Hajime KAWAKAMI, Tsunayuki OHYAMA, Keisaku TSUNEM ...
Article type: Article
Pages
41-51
Published: March 30, 1976
Released on J-STAGE: March 30, 2018
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This paper describes an estimating method of natural frequency of stiffened panel in aft peak tank. As for the estimation of natural frequency in air, we use the transfer matrix method by Fourier series for stiffened triangular and trapezoidal panels, and by carrying out a model test, we examine an estimating method of added virtual mass. In addition, we conduct a vibration experiment on actual ship, measure the natural frequency, and compare the results with those obtained by the above method. The conclusion obtained from this study is as follows: 1. The natural frequency in air can be estimated by the transfer matrix method with sufficient accuracy. 2. The inertia coefficient for stiffened triangular or trapezoidal panel is almost the same as that for rectangular one which can be estimated by Kito's method. 3. The values of natural frequency measured on actual ship and those obtained by the transfer matrix method agree well.
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Yoshikazu MATSUURA, Kenji ARIMA
Article type: Article
Pages
53-59
Published: March 30, 1976
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This paper deals with a calculation method of hull natural frequencies of the vertical vibration, taking account of the fact that it is necessary to use actual mode shape in order to estimate the added virtual mass accurately, Natural frequencies computed by this method,using Rayleigh-Ritz method, are in good agreement with those obtained by model tests, the models being ellipsoids of revolution and Lewis form ship models.
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[in Japanese]
Article type: Article
Pages
61-69
Published: March 30, 1976
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Article type: Appendix
Pages
71-75
Published: March 30, 1976
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Article type: Appendix
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Published: March 30, 1976
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Article type: Appendix
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Published: March 30, 1976
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Article type: Appendix
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Published: March 30, 1976
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Article type: Appendix
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Published: March 30, 1976
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Article type: Cover
Pages
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Published: March 30, 1976
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