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Article type: Cover
1983 Volume 68 Pages
Cover1-
Published: January 25, 1983
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Article type: Cover
1983 Volume 68 Pages
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Published: January 25, 1983
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Yoshio SUMIKAWA, Hiroyuki SADAKANE, Akira HAMANO
Article type: Article
1983 Volume 68 Pages
1-8
Published: January 25, 1983
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The Kanmon Strait which has a complicated topography is an international traffic route and an important fishing ground for coastal fisheries. Shipping traffic and fishing operations overlap each other in this area, where the risk of marine accidents exists. The survey of fishing operations in this strait was made by questionnaires. And the survey of the shipping traffic at Oseto in the Kanmon Strait was carried out with shipbone radar for 24 hours together. The results of these surveys are as follows; (1) The kinds of fishing methods are mainly angling and small type trawl. According to the season and the fishing ground, other fishing methods are used. (2) The area of operations of fishing boats covers the whole area that was surveyed. In autumn the fishing operations were found to be most numerous, and especially they were concentrated in the Kanmon Passage. (3) At Oseto area there was a great scattar in the speed of the ships passing through, and frequently ships were overtaking and passing other ships and many of them entered the left side of the Passage.
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Rihei KAWASHIMA, Kiyoshi AMAGAI
Article type: Article
1983 Volume 68 Pages
9-14
Published: January 25, 1983
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Fishing vessels can be classified into several specially designed types, such as the stern trawler, purse seiners and gill net fishing vessel. This is the outstanding feature of recent fishing vessel developments in Japan. On the other hand, small fishing vessels are usually used for various fishing operations, and are all equipped with the necessary fishing gear for the respective operations. Considering the practical uses of small fishing vessels in commercial fishing, their safety on the seaway should be assured by considering the changes in stability for each fishing operation. Therefore, based on the investigation of transverse stability in various fishing operations, the authors discussed criteria for stability of fishing vessels, especially in commercial fishing operations.
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Tatsuro MATSUOKA, Rihei KAWASHIMA
Article type: Article
1983 Volume 68 Pages
15-23
Published: January 25, 1983
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The experiment with the 2 meter long, selfpropelled model of 19.9 GT small gill netter in head sea was carried out in wind waves. The simultaneous records of relative wave elevation and shipping water on 13 ordinates were analysed, and the analytical values were compared to the calculated values according to the theoretical model where the relative wave elevation is generated by the longitudinal motions of a hull, the incidental wave and the wave elevation generated by running of the ship in head sea. Following results are obtained through the experiment. Equivalent probability water level was high on S.S. 8-9, and the shipping water broke out continuously along the X-axis. The powers of the spectra of the relative wave elevations which were calculated according to the model were smaller than the experimental values.
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Yasuo ARAI, Yumio YONEZAWA, Nobuyoshi KOGUCHI, Susumu HASHIMOTO, Toyos ...
Article type: Article
1983 Volume 68 Pages
25-35
Published: January 25, 1983
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Measuring Ship's Maneuvers on board, it is said that the Numerical Integration Method which calculates her track by summing up distance running a short interval with respect to "advance" and "transfer" is the most simple method. However, the accuracy of speedometer, especially speed over the water with the Doppler Sonar is not yet applied enough. In our measurement, the Computer Plotting System equipped on the Training ship "TAISEI MARU" (5856.25 G.T., Turbine Engine 7000PS) was combined with the Doppler Sonar and the Gyro Compass, and they were worked to make experiments on plotting her track and getting the accuracy of speed over the water. Our conclusions are as follows. ・ The accuracy is under the influence on the time lag, senser-installed error and side stream. ・ The difference between the Numerical Integration Method and other methods such as the Dumb-Card Method or the Dutchman's log is due to the difference between each water depth measured.
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Yasuhito INABA, Rihei KAWASHIMA
Article type: Article
1983 Volume 68 Pages
37-42
Published: January 25, 1983
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The authors recently had a chance to report on a method of determining the derivatives corresponding to a single set of experimentally recorded turning trial data of an actual vessel by means of a procedure of successive approximation. In this paper, computations are made for 11 kinds of fishing vessels covering various lengths and displacements as shown in Fig.1. The computed results of linear and non-linear derivatives, agreeing to each vessel's data of motion in transitionary and stationary states, shown in Table 4, are compared with the derivatives based upon the results of studies made by S. Inoue. In some cases, non-linear terms in Y_H' dominated. Some considerations about the above subjects are presented.
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Kaname SATO, Hayao AKIZAWA, Yujiro SAOTOME, Isao KASUGA, Yuji MINE, Yo ...
Article type: Article
1983 Volume 68 Pages
43-54
Published: January 25, 1983
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In this study, experiments were conducted to examine the feasibility of adopting the self-polishing anti-fouling paint (SP type A/F), which has never been used for fishing boats. Results are as follows: (1) The polishing effect of the SP type A/F paint reduced fuel consumption, and about 500 liters of fuel oil can be saved per day, which is equivalent to the prevention of speed reduction of 0.26 knots. (2) The number of dry dock for maintaining smooth and cleanliness of bottom plate is enough to be once per year, having conventionally been achieved by two dry docks per year. (3) The paint film is resistant enough against mechanical damage caused by fishing gear and it is also responsive to changes in the marine environment. (4) Although the SP type A/F paint is a little more costly than the non-soluble A/F paint, the adoption of the SP type A/F paint for fishing boats is recommended for reduction of fuel oil and dry dock cost.
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Saburo SUZUKI, Noboru NAKAI
Article type: Article
1983 Volume 68 Pages
55-64
Published: January 25, 1983
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We had the actual experiments to investigate the individual effect of marine foul bottom and propeller with the ship (361 GT) installed CPP. The experimental results were obtained by running on three conditions. These conditions are: (1) Bottom and propeller are foul a few days before docking. (2) Bottom is clean and propeller is foul right after docking. (3) Both of them are clean, because propeller is polished up in the water after running with condition (2). With the results, it was calculated that foul propeller blade and hab (boss) took respectively the rate of losing power by friction to SHP, and we referred to the practical method of bottom's roughness for the ship installed CPP.
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Shushin SATOH
Article type: Article
1983 Volume 68 Pages
65-70
Published: January 25, 1983
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Since the 1972 Collision Regulations came into force, certain problems have been proposed by contracting countries about Rule 10 and Traffic Separation Schemes. Some of them were amended on last IMCO Assembly but there are many problems to solve. This paper proposes some suggestions to solve that problems concerned Rule 10 and T.S.S.. 1. Clarification of the word concerned Rule 10 and T.S.S., especially the definition of words being used in Rule 10, should be considered without delay. 2. T.S.S. should be reviewed in aspects on the application of Rule 10 including other Rules of 72 Collision Regulations and on the existing traffic patterns of traffic flow in the areas by reexaming traffic survey. As T.S.S. should be limitted to what is essential in the interests of safe navigation, inadequate T.S.S. for application of Rule 10 and conflicting with existing traffic pattern should be cancelled or revised. 3. Special navigation rule should be introduced on the some T.S.S. which could not control by Rule 10. That rule should be included obligation to use T.S.S., restriction on entering or leaving, or crossing T.S.S. and some privilege on the navigation rule for vessel using T.S.S. should be considered about some of T.S.S..
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Toshihiko MATSUO
Article type: Article
1983 Volume 68 Pages
71-78
Published: January 25, 1983
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Recently there have been reported on casualties caused by the shifting of their cargoes in conventional vessels carrying concentrates in bulk. IMO has been considering the conventional vessels should carry concentrates having a moisture content not in excess of the transportable moisture limit. In this connection, the author prepared the Pyrite in test box fixed on a shaking table and measured the soil pressure, the change of moisture content. And some fundamental results on the shifting of concentrates were obtained through these experiments. As a result, the shift of concentrates may occur due to the liquefaction and the movement of moisture contained in their cargoes by consolidation which is generated by ship's vibration and motions.
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Akio M. SUGISAKI, Yasutake NISHIYAMA
Article type: Article
1983 Volume 68 Pages
79-86
Published: January 25, 1983
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The authors have devised and developped a method of ship operation mission analysis and synthesis according to introducing ship operation phase, which is defined as a ship operation situation distinguished from the other, as a predominant parameter through the research. Applying those to a tanker's and a container ship's operation, data characterizing ship operation mission such as mission segment name, segment automation level, relation between man (crew) and machine, relation among segments and so on are obtained. Furthermore, some results of ship crew number estimation applying the synthesis method to the mission data are shown.
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Takashi KURODA, Mitsuo YOSHIDA
Article type: Article
1983 Volume 68 Pages
87-94
Published: January 25, 1983
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The most ideal seaman is a man who loves the sea, the ship and the seafarer himself. How does the seaman feel this problem? Concerning this question, we attempted to make clear the above subject. As samples 438 seamen and 1376 persons of the common people were selected. The obtained data using S.D. method on the images of the sea, the ship and the seafarer were analyzed by factor analysis. The results were as follows: 1. We extracted three factors from each of the images, that is, factors of dynamics, affection and psychological distance on the image of the sea and the ship, and the former two factors and factor of professional evaluation on the seafarer. 2. Using the obtained factor score, we compaired the images of the seamen with those of the common people. As the result, the self-images of the seamen were negative. 3. Among the seamen, the score of the deck part and officers was higher than that of the other parts and crew. The score of the seamen brought up mountainous districts was higher than that of the others.
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Akira KANDORI, Yutaka NAKADA
Article type: Article
1983 Volume 68 Pages
95-102
Published: January 25, 1983
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In the recent years, sailing obstructions and shipping accidents have been frequently effected by the congestion of temporary anchoring ships at the offing of harbour. Therefore it has been required to take the safe measure of the shipping traffic system including the anchoring ship. The authors carried out a survey on the actual state of the anchoring ship at Muture anchorage lying off Kanmon harbour. The survey was performed by land set radar operating throughout 72 hours, and took the photograph of the radar picture every 1 minute. In addition, the size and the type of anchoring ships, and the time of entering and leaving the anchorage were investigated by visual observations. The obtained data were analysed statistically to clarify the characteristics of the anchoring ship behaviour; and it was found that the behaviour characteristics could be expressed in the mathematical models.
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Yuzo IGETA, Tsuneo SUZUKI, Haruo SATO
Article type: Article
1983 Volume 68 Pages
103-112
Published: January 25, 1983
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The authors have made an experiment on board the ship with the aim of obtaining data which can be utilized for the search of a small fishing boat in distress at sea, and the following results have been gained, 1) The floating material was drifted to the leeward from the point where the material had been brought by the current. Therefore it is basically important to measure the current speed at the sea of the disaster. 2) The drift speed of the small drifting material by wind and wave (Vs) tends to decrease as the wind speed (Vw) increase. The relationship between them was illustrated as Fig.15. 3) Regarding (2), when a drift material was found the distance between an observer and the material would be estimated by the drifting time and Fig.15.
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Sakae NAGAOKA
Article type: Article
1983 Volume 68 Pages
113-121
Published: January 25, 1983
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A mathematical collision risk model is used for evaluating air traffic control (ATC) separation standards. As one of the parameters required for this model, the probability of overlap in vertical dimension based on height keeping errors should be estimated in order to evaluate ATC standards. Data on height keeping errors have been collected by using a simple height finding radar called NAMS. Since the altitude of aircraft is assigned by an isobaric surface called the flight level, information on the assigned flight level is required for analyzing the data on height keeping errors. These data must be correlated with flight progress strips used for ATC in order to confirm assigned flight levels for normally operated aircraft. However this taking correlation is not an easy job because of considerable difference between the measured height and assigned pressure altitude. Therefore an estimation method for the pressure altitude was developed to facilitate correlating these data as easily as possible. This paper first describes a method for estimating the indicated pressure altitude using data obtained by NAMS and newly developed software for NAMS. Then, some statistical results on estimated pressure altitudes are compared with the measured heights from the ground using NAMS.
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Michiko YAMASHITA, Kazuo TAGUCHI
Article type: Article
1983 Volume 68 Pages
123-127
Published: January 25, 1983
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OMEGA signals (13.6kHz) from Hawaii are received at Kagoshima in Japan. As the cycle slipping (i.e., the signal phase retards by 1 or 2 cycles) is often seen during sunrise, a numerical work is previously done with use of the east-west mode propagation under an anisotropic and homogeneous ionosphere. In this paper, the cycle advance which occurs during sunset (i.e., the signal phase advances 1 or 2 cycles) is analyzed from consideration of reciprocity between day-to-night and night-to-day propagation geometries. It is concluded that if the complex ionospheric reflection coefficient for the first order mode in the daytime is located in the fourth quadrant, these anomalous phenomena can be realized at sunset and sunrise.
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Nobumichi ISHIMURA
Article type: Article
1983 Volume 68 Pages
129-137
Published: January 25, 1983
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There is the important problem of finding the effective point reduction method that permits map data to be stored compactly in digital form because maps normally contain a large amount of data. In this paper, a new method for the point reduction in coastlines of digital maps by spline interpolation is proposed. The optimal determination of the knot sequence of given coastlines is very difficult and there is no sufficient theory. Therefore the influence of the choice of the knot multiplicity one and three upon the shape of generating coastlines is discussed.
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Takashi HIRAIWA
Article type: Article
1983 Volume 68 Pages
139-145
Published: January 25, 1983
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Yasuyuki SHIRAI, Hiroshi SUZUKI
Article type: Article
1983 Volume 68 Pages
147-151
Published: January 25, 1983
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This paper describes about the dynamic property of the tilt angle of a magnetic compass card while the compass bowl swings with the ship's rolling. Experiments were carried out by swinging the bowl sinusoidally using a servo-mechanism. A resonant point of the card-tilt-movement was observed at a rolling frequency. In order to prevent the resonance between the card-tilt-movement and the ship's rolling, the authors tried to make openings on the card from its inner part to a circle line on the card. This resulted a comparatively good shift of the resonant point, a good effect on the amplitude gain of the card-tilting and also a possible effect of decreasing the raise of the card from the pivot point under ship's vibrating circumstances.
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Article type: Appendix
1983 Volume 68 Pages
App1-
Published: January 25, 1983
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Article type: Appendix
1983 Volume 68 Pages
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Published: January 25, 1983
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Article type: Appendix
1983 Volume 68 Pages
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Published: January 25, 1983
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Article type: Appendix
1983 Volume 68 Pages
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Published: January 25, 1983
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Article type: Appendix
1983 Volume 68 Pages
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Article type: Cover
1983 Volume 68 Pages
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Published: January 25, 1983
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Article type: Cover
1983 Volume 68 Pages
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