日本航海学会論文集

表紙

原稿種別: 表紙
1989 年 80 巻 p. Cover1-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.Cover1

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目次

原稿種別: 表紙
1989 年 80 巻 p. Cover2-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.Cover2

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論文の内容訂正

原稿種別: 文献目録等
1989 年 80 巻 p. Misc1-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.Misc1

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インドネシア・カヌーの船型と船体抵抗について

高山久明, 林田滋, マセンギアレックス

原稿種別: 本文
1989 年 80 巻 p. 1-8
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.1

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Coastal fishing canoes with outriggers in both sides, locally called "londe" in North Sulawesi have a very long snout extended from the lower corner of stem which is slightly curved upward, and well resembles to an elephant tusk in shape. A series of resistance tests on three models; two londes with or without the snout and a dugout canoe with no outrigger of Kendari in Southeast Sulawesi, was undertaken to prove respective contributions of the hull body itself, outriggers and snout. Conclusions of the tank tests are the following: 1) The snout hardly contributes to the resistance. It however has an effect to restrain trim changes by the head at a range of high speed of 1.4 of Fn∇ or more. 2) The total resistance coefficient, 05γT of outriggers is estimated as 0.01 between 0.4 and 1.5 of Fn∇, from resistance differences among three outrigger conditions; a londe model with outriggers on one side, one on both sides, and another without an outrigger. 3) The resistance of londes which have very slim bodies, is greatly small as about 1/2 of Japanese coastal fishing boats, called Wasen [Takayama, 1988].

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応急処置としてのストップホールの効果

眞能創, 河辺寛

原稿種別: 本文
1989 年 80 巻 p. 9-16
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.9

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To drill stop hole at end of a crack is well-known emergency measure to stop propagation of a crack of hull member which is found at sea. But it is required to clear its effect more numerically. Supposing a crack which initiates at midship part of a strength deck, authors calculate stress distribution around the crack and stop holes at the both ends of it. From our study it is clarified that stress concentration factor of the hole decreases with the ratio of stop hole radius to crack length. This means that the hole is effective when crack is short and drilling stop hole with largest drill which can use on board of the ship is required. Authors study on improvement of hole and find that the factor is decreased considerably by using the improved stop hole. Allowable operation term after drilling the hole is judged from fatigue crack initiation life at the hole. It is concluded that the crack is to be repair as soon as possible when the factor is over seven and ship sails severe sea zone in winter.

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二港揚げVLCC着離桟横移動時のタグ所要支援力

本田啓之輔

原稿種別: 本文
1989 年 80 巻 p. 17-24
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.17

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When estimating a magnitude of tug power to assist a berth manoeuvre of VLCC, we have to know a transverse water force exerted by lateral motion of ship and a side wind force. For this purpose, author first conducted the model experiment for a transverse water resistance in the shallow water at a very smooth speed, secondly carried out actual VLCC tests for berth clear manoeuvring at six oil terminals in order to check a reasonable value of the transverse water force coefficient C_<wy> at half loaded condition and ballasted conditions, and finally submitted a proposal about the reasonable value of C_<wy> and a standard value of wind speed, current speed, and jetty approach speed for determining the tug power in the course of an ordinary berthing.

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漁船の転覆海難データベースとその解析

天下井清, 寺尾裕, 高石敬史

原稿種別: 本文
1989 年 80 巻 p. 25-36
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.25

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A data base of Japanese fishing vessel casualty records has been constructed in order to analyse casualty tendencies concerning with flooding, capsizing or sinking accidents. The significant data of every accident have been picked out from the documents describing the decisions by the Japanese Maritime Disaster Inquiry Agency for ten years 1978-1987, and the necessary items of each record have been stored on a computer treatable data base. One data record consists of various items, for example the ship data, fishing type, results of accident, environmental conditions, causes of the accident due to the environmental conditions, construction of the vessel or human factors. Total 370 cases have been stored. Analysing of the data base, some typical patterns have been derived for the fishing types and size of vessels. It has been found that the shipping water is the main cause of the accidents of fishing vessels in rough weather. The accidents happened almost equally independent to the wave encounter angle of head (incl. bow), beam and following (incl. quartering) seas.

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係留岸壁長が不足する場合の船体運動に関する実験的研究

久保雅義, 斎藤勝彦, 榊原繁樹

原稿種別: 本文
1989 年 80 巻 p. 37-44
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.37

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According to an enlargement of a ship, the case in which the length of a mooring quay wall is insufficient is occurred. In such a case, it is reported that some cutting accidents of mooring lines are happened. In this paper, the experiments on the moored ship motions are carried out by varying length of quay wall. The obtained results are summarized as follows: (1) The short period ship motions don't vary much by jutting out the bow from a quay wall. (2) The moored ship motions caused by a long period wave which is induced at the starting time by the wave generator become considerably large in the case of the short quay wall. (3) The ship motions along the short quay wall can be calculated fairly well in the range of short wave periods by strip method, but not in the range of long wave periods owing to three dimensional effects.

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商船大学生の海洋志向性-II

嶋田博行, 黒田隆, 吉田光雄

原稿種別: 本文
1989 年 80 巻 p. 45-53
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.45

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Social surveys on positive interests in the sea by means of semantic differential method were conducted at mercantile marine and non-marine colleges. As a result, mercantile marine students had better images than about ten years before. Students who were trained in ship maneuvering practice had more positive attitude toward the sea than the other students in the mercantile marine college. Shape of frequency-distribution curves of image scores of students who wish to choose a seaman as their own occupation looked like a J. Their image scores about the sea were higher and individual differences were smaller than the others. Their attitude toward the sea was exceedingly positive in spite of difficulties in actual choice of occupation.

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ホール素子を用いた3軸固定型電子コンパスの試作

宮本佳則, 濱田悦之, 白井靖幸, 斎藤清隆

原稿種別: 本文
1989 年 80 巻 p. 55-61
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.55

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There are some direction sensors of ship's heading or bearing besides magnetic compass and gyro compass, and it is necessary that those sensors are compact and have electric output. This paper describes the construction and performance of a newly designed electronic magnetic compass utilizing hall elements. The hall elements were equipped with perm-alloy rods in order to enhance the weak earth's magnetic flux density The outputs from two clinometer set in the roll and pitch axes consisted of a pendulum and a low torque potentiometer work to eliminate the influence of ship's rolling and pitching. The outputs of the magnetic sensors and clinometers processed by an A/D converter indicate the ship's heading immediately with the aid of a personal computer. Both laboratory and field test on a small boat showed a good indication of ship's heading with errors of less than 1 degree in the usual condition of ship's rolling and pitching. This will contribute to the remote indication of the ship's heading and input of the heading towards other navigational instruments of small boats or other vehicles.

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山岳が100kHz帯電波に与える影響 : 山岳などによる位相擾乱

渡辺泰夫

原稿種別: 本文
1989 年 80 巻 p. 63-67
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.63

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Along the electro-magnetic wave flows of 100kHz LF band in the vicinity of a triangular mountain model, the phase fluctuation has been calculated and pictured by means of the Finite Element Method. It is shown that conspicuous phase lag on the wave coming slope of the mountain has taken place and on the contrary, some phase restoration on the against side slope has been recognized within λ/2 from the top of the mountain. This result well resembles phenomenon which was observed at the sea coast when the 100kHz LF band electro-magnetic wave went across the boundary from the land of low conductivity to the ocean.

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橋梁等におけるレーダ波の反射並びに偽像予測シミュレーションの改善について

竹中康雄, 佐藤尚登

原稿種別: 本文
1989 年 80 巻 p. 69-80
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.69

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Radar false echoes which jeopardize the safety of navigation are sometimes produced by the reflection of the Radar wave caused by a bridge. This paper presents a practical method which analyzes false echoes as the passive-relayed-propagation of the Radar micro-wave reflected by a huge plane like a bridge, and reports the result of applying this method to the estimation of false echoes with the help of a computer. The estimated results of the Radar false echoes approximately correspond to the values obtained by the measurement at Kamagari-Ohashi Bridge, which is located in the Inland Sea of Seto.

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レーダ管制における最小間隔基準の設定法

長岡栄, 天井治, 渡辺泰夫

原稿種別: 本文
1989 年 80 巻 p. 81-92
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.81

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This paper proposes an analytical method for establishing a separation minimum for air traffic control (ATC) using a monopulse SSR (secondary surveillance radar) of which coverage is extended to 250NM. The azimuth estimation accuracy of the monopulse SSR, what we call, the long range SSR (LSSR), was significantly improved compared with that of conventional SSR. As an index of a collision risk due to azimuth errors of the LSSR, the close approach probability (CAP) associated with the probability of overlap of aircraft in azimuthal direction is used for evaluating the safety of the surveillance system. The CAPs for both the LSSR and the conventional SSR are estimated through modeling distributions of azimuth errors and these are compared each other. The results show that the CAP for the LSSR is significantly smaller than that for the conventional one under 5NM radar separation minimum.

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レーダ画像のフラクタル次元評価

石村信道

原稿種別: 本文
1989 年 80 巻 p. 93-99
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.93

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It is very difficult work to evaluate numerically the complexity of radar images, although it communicates valuable information on the control of the radar systems and the recognition of the objects on radar images. In this paper, therefore, the numerical measurement of the complexity in radar echo distributions using fractal dimensions is proposed. Experimental results for real radar images show that this evaluation considerably agrees with the human sence for them and this simple value of the dimensions can reveal the complexity well. Also, the relationship between the fractal dimensions and radar gains, and the application of the fractal dimensions to the automatic recognition of the objects on radar images are presented.

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フレーター法の解の個数と発展的適用法

今村純也

原稿種別: 本文
1989 年 80 巻 p. 101-108
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.101

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Fratar's method provides one method for estimating the future traffic OD volume based on the present OD pattern. The method is widely known as a method to estimate a square matrix, but is applicable to estimate general (m, n) matrix beside OD estimation. This paper describes following subjects. (i) Study of solution number in estimating OD under only one set of control total, which consists of two vectors as sums of rows and columns. (ii) Expansion of Fratar's logic to estimate a matrix under constraints satisfying two or more sets of control total. (iii) Presentation of a solution of example problem using advanced Fratar's logic: Estimation of future inward vessels into ports in Osaka bay classifying by grosstonnages, under constraints of two control totals, that are number and tonnage of total vessels in a year. (iv) Consideration of the applicability of advanced Fratar's logic to other problems: Estimation of future modal split of total traffic in some areas such as airplanes, trains, cars, etc.

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作業区域が海上交通流に与える影響

原潔, 井上欣三, 佐藤尚登, 辻啓介, 河合雅司

原稿種別: 本文
1989 年 80 巻 p. 109-116
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.109

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A large bridge is under construction on the Akashi-Kaikyou, and the working areas were set up close to the congested marine traffic route. The authors analyzed the effect of these areas on the traffic flow using the results of the traffic surveys whenever the areas were extended three times. When there was one area on the south side of the route at the first survey, the flow of ships passing inside of the route shifted to north in general for keeping the clearance from this area. When the route was sandwiched between two areas on the second survey and third one, the traffic density on the route much increased by which a number of small vessels restricted by the area flowed into the route. The effect of the areas on the flow occurred around 2-3kms in front of the working area. This values increased due to the expansion of the area. That is about 7 times of the width of the area. Using the observed results, we proposed an index which indicates the variety of ship tracks.

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期待効用値を用いた最適コンテナ船荷役の近似解法

今井昭夫, 三木楯彦

原稿種別: 本文
1989 年 80 巻 p. 117-124
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.117

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It is rather difficult to obtain an optimal sequence of loading containers into a containerized ship by computerized algorithm because it has two different objective functions; optimization of vessel condition like GM, and minimization of the number of containers to shift for picking up target containers on a container terminal. This paper describes a heuristic algorithm for the optimal loading sequence problem. The problem formulated as an integer programming problem with one objective function including the expected number of containers to shift and the contribution rate for GM is solved by the algorithm which consists of two solution methods, i.e., the classical assignment problem by Hungarian method and the integer programming by branch and bound method. In our algorithm a basic approximate solution is obtained by the assignment problem first. If the GM value associated with this solution is satisfied by the ship's condition, then this solution becomes optimal. Otherwise, a revised approximate solution, which offers a GM value more than or equal to the minimum GM, is calculated by the integer programming method.

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石炭の運送許容水分値の測定法の開発

田中正人, 浦環

原稿種別: 本文
1989 年 80 巻 p. 125-131
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.125

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A test method designated "Penetration Method" is proposed for the determination of the transportable moisture limit (TML) for coals. The procedure of this method is as follows: (1) The sample in a container is subjected to vertical vibration. (2) A penetration bit and a surface indicator are put on the surface, to detect the occurrence of liquefaction. (3) When the bit penetrates coals for 100mm in 6 minutes, it can be judged that the liquefaction takes place. This method was developed through repeated improvements of the vibrating plate test proposed by the United Kingdom. It is shown that the TML measured by the Penetration Method would be on the safer side than that by the vibrating plate test.

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石炭の飽和度と液状化の関係に関する基礎的研究

浦環, 坂巻隆

原稿種別: 本文
1989 年 80 巻 p. 133-140
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.133

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Strength of liquefaction of sands increases when the degree of saturation decreases. From this point of view, Sweden proposed the Proctor/Fagerberg method to IMO as an alternative test method of the Transportable Moisture Limit. This method introduced 70% degree of saturation as the criterion for the safe transportation of cargoes in bulk. But the applicability of this criteria for coals was not clear because the volumetric change is considerably large due to fragility of edge of the particle. To examine the effect of the degree of saturation on the liquefaction strength, triaxial compression tests for coal were carried out. Even when the degree of saturation is 50%, the coal is liable to liquefy by applying a cyclic load of stress ratio SR=0.3. It can be said that the pore pressure is easy to rise under the unsaturated condition. On the basis of these experimental data, it is concluded that Proctor/Fagerberg method should not be applied for coals.

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論文集掲載審査用論文執筆要領

原稿種別: 付録等
1989 年 80 巻 p. App1-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.App1

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論文審査内規抜粋

原稿種別: 付録等
1989 年 80 巻 p. App2-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.App2

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論文審査内規申し合わせ事項

原稿種別: 付録等
1989 年 80 巻 p. App3-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.App3

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講演審査用アブストラクト執筆要項

原稿種別: 付録等
1989 年 80 巻 p. App4-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.App4

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奥付

原稿種別: 付録等
1989 年 80 巻 p. App5-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.App5

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裏表紙

原稿種別: 表紙
1989 年 80 巻 p. Cover3-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.Cover3

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CONTENTS

原稿種別: 表紙
1989 年 80 巻 p. Cover4-
発行日: 1989/03/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.80.Cover4

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