日本航海学会論文集

表紙

原稿種別: 表紙
1976 年 54 巻 p. Cover1-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.Cover1

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目次

原稿種別: 表紙
1976 年 54 巻 p. Cover2-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.Cover2

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1976年8月米国で開催の国際航法学会参加についてのお知らせ

原稿種別: 付録等
1976 年 54 巻 p. App1-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.App1

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デッカ電波の長距離伝搬特性-II : 北九州チェン…II

田口一夫, 西本金三, 中根重勝, 中島裕, 西野朝生, 佐藤尚登, 甲斐靖彦, 松浦静則

原稿種別: 本文
1976 年 54 巻 p. 1-10
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.1

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During the year 1973-1975, five observations on Decca frequencies for 72 hours composed of decometer reading and accompanying with field strength measurements were made at three sites in the Inland Sea (Seto-Naikai). The experiments described in the paper lead the conclusions suggesting some interesting behavior of Decca radio waves. In both signal strength and ambient noise seasonal variation did not change clearly that were obtained by field strength meter with 1kHz bandwidth. Since the field strength in daytime were nearly constant through the observations at Ooshima and Yuge/Hiroshima where is 192km and 293km from master station respectively, the ground wave could be ascertained at two sites. Observed field strength versus distance was found to be a little more attenuated than Norton's theory, thereafter it is suggested that it is due to the propagation effects of multi-islands topography and mountain path in Kyushu island. Decometer readings of each pattern in daytime at Ooshima and Yuge/Hiroshima were enable to assume nearly constant (Table 5). Accordingly the authors considered that these results established repeatability and reliability of the system. In night, the lane slips on decometer occurred frequently in the range of such unexpected phenomenon. To the contrary, the lane slip could not be found at Kagoshima where is the same distance of Yuge from master station. Analysis of difference on the phenomenon taken place at two sites could not introduce the accurate conclusion. However, the authors could demonstrate that the difference of propagation path will only be due the directional difference north/south to east/west.

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ドプラーソナー方式潮流計について

金丸茂, 長尾修爾

原稿種別: 本文
1976 年 54 巻 p. 11-17
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.11

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The condition of the sea such as the directions and speed of the tidal current are very important in the case of offshore works. By applying the doppler sonar system instead of the conventional one, such as the propeller or electro-magnetic system, we developed a new instrument-doppler system tidal current meter, thereby measuring the speeds and the directions of the tidal current instantaneously and recording the data contnuously. From the test results of the instrument in the Strait of Akashi we have come to the conclusion, that the doppler system tidal current meter will be put into practical use.

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レーダ・アスペクタの研究

飯島幸人, 林尚吾

原稿種別: 本文
1976 年 54 巻 p. 19-24
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.19

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The first step of collision avoidance is to fix navigator's attention on an attitude of another ship concerned. When two ships encounter, the relative attitude between ships can be expressed by the aspect angle that has so far been got by means of radar plotting. If we are able to have an aspector that is the device to instantly know the aspect angle, it will be found greatly advantageous to all navigators for collision avoidance. In this point of view, the radar aspector has been studied. The theory is very simple that is, the radar transmits the radar wave in pulses of periods propotional to the rotation angle of radar antenna from a ship's head, and the receiver on the other ship receives the radar wave from the transmitting ship and calculates the pulse repetition periods that show the aspect angle of the transmitting ship. For example, when the pulse repetition periods of radar are selected from 1000μs to 1359μs depending on one antenna rotation, the periods of received pulse repetition minus 1000μs directly show the aspect angle. The radar aspector based on the above idea has experimented by the trainning ship and showed good results. The theory, the fabrication and the results of experiments are reported in this paper.

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距離測定ロラン受信機の研究と実船実験

今津隼馬, 林尚吾

原稿種別: 本文
1976 年 54 巻 p. 25-31
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.25

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Recent operation of Loran-C system on a direct-ranging mode has been proposed. This paper discribed the ability of Direct-Ranging Loran receiver (D.R.L.) was manufactured as an experiment. The experiments were made of measurement of Loran-C receiving signals with this receiver at stationary point and ship. The results were obtained as follows a) Very fast trace was useful for weak groundwave observation. b) During periods of high noise, the groundwave range for this experiment area extended to 1000 nautical miles or more. c) Measurement signals at twilight useful for groundwave discrimination. d) It has been demonstrated that Line of Position accuracy of 100 meters rms can be obtained.

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広・狭ビームを用いた海面反射妨害抑制方式

韮沢富次

原稿種別: 本文
1976 年 54 巻 p. 33-36
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.33

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For the purpose of sea-clutter suppression, a new radar sysem is presented which can detect weaker signals among the clutter. The principle of this system is based upon the fact that sea-clutter level depends on the radar beam width, while the reflected signal level from a small target does not. In this system, wide and narrow beams are used. Then discrimination of the signals from the clutter is performed by detecting the quotient of the two receiver outputs corresponding to wide and narrow beams. This system may be effective to rain, snow, fog and cloud-clutter, too.

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NNSSと従来の船位測定方法による船位の相対誤差について

樽美幸雄, 和気博嗣, 笠原健夫

原稿種別: 本文
1976 年 54 巻 p. 37-42
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.37

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At present, navigational receivers for NNSS have been installed in many ships and given highly accurate ship positions. The authors have got interested in the system and studyed on the conventional position-fix-methods (for example, Radar, Loran, Celestial observation, etc) based on the measurments of relative positional error which is defined as the difference between the position fixed by NNSS and the one by the conventional methods. There obtined 1047 relative positional error data on board three ships (SEIKO MARU, KITANO MARU, TOBEI MARU) having NNSS receiver. The analyzed results of those are presented.

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聴覚見張についての一考察

大西典一, 鈴木三郎

原稿種別: 本文
1976 年 54 巻 p. 43-46
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.43

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According to the Convention on the International Regulations for Preventing Collisions at Sea, 1972., is stated clearly in Rule 5 that aural look-out shall be maintained at all time. How shall we do as a navigator keep a proper watch concerning aural look-out considering the signal? So we practised the measurement of noise level of experimetal ship and analysed them and then gained the total transmission loss and minimum audible sound pressure. We compared the minimum audible sound pressure in the opened-bridge with closed-bridge. 1. Noise level of experimental ship's bridge is very high and so threshold of audibility is high. We need to contrive to deaden the noise of bridge. 2. Minimum audibility sound pressure level in the opened-bridge is less 10〜20dB than closed bridge. 3. We must always keep a watch under opening windows and doors. 4. Distance of audibility on the experimental ship is extremely short.

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海上交通事故の研究-V : 損害の程度

藤井弥平

原稿種別: 本文
1976 年 54 巻 p. 47-54
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.47

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3, 238 vessels involved in collisions and 1, 841 stranded vessels are surveyed and the results give the probabilities of collision and stranding as functions of ship size and degree of damage. Analitical representation of the probability of collision, f_(x, y) is studied where y is the ratio of gross tonnages of collided vessels and x is the degree of damage. f_(x, y) yields the average value of x as 0.015y^<0.6> and this allows the estimation of the total amount of economical loss due to collision in a certain water area where traffic has been surveyed.

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船舶交通流制御シミュレータについて

山田一成, 田中健一

原稿種別: 本文
1976 年 54 巻 p. 55-59
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.55

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In order to evaluate the signal control systems of the marine traffic flow on the restricted water, a new simulator has been developed by utilizing the merits of the mini-computer and the maneuvering performance of human operators. The simulator system contains closed loop circuits for each ship, each of which has three elements, namely an information analyser, a display apparatus and a human operator, and gives informations for maneuvering each ship. The main specifications in the system are as follows: Maximum ship number: 300 Number of size classifications of ships: 5 Number of waterway entrances: 12.

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アンカー落下時の水抵抗に関する模型実験

本田啓之輔, 松本和裕

原稿種別: 本文
1976 年 54 巻 p. 61-68
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.61

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In order to find the fluid drag coefficient (C_D) for dropping of an anchor, authors carried out the tank test on five model anchors which are types of JIS-stockless, JIS-stock, AC-14, Danforth and US-navy, and we obtained the results of model test as follows ; (1) The value of these C_D for dropping of anchors varies according to the dropping posture of anchor and are hardly greater than 1.0, and for example, the value of C_D of JIS-stockless is 0.6 in the case of the posture opening flukes and also 0.85 in the case of the posture closing flukes. (2) Each of the drag of JIS-stockless and AC-14 type in the case of the posture opening flukes is more less than that in the case of the posture closing flukes. (3) Terminal velocity for dropping of an actual anchor with chain cable without brake control will be able to estimte more useful by using the value of twice C_D of anchor itself, and a certain degree of approximate on the terminal velocity (U) for dropping of an actual anchor may be obtained by the following formula, as a guide to good practice. Where W_T is an an anchor-weight in ton. [numerical formula]

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救命艇と膨脹式救命いかだの性能比較実験-II : 操作運用に関する実船実験の考察

中村祐三, 伊藤良夫, 中島保司

原稿種別: 本文
1976 年 54 巻 p. 69-76
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.69

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life-Saving Appliances must be operated rapidly and safely when the ship is abandoned. For that purpose, LSA, launching devices, and their equipments must be fit for physical and mental demands of operators. In this experiment we break down the work into several steps using micro-motion-method from the stand-point of human engineering, and we evaluated construction and method of the work and work-space in the whole process of Lifeboat and Liferaft being launched, victims boarded, and leaving the ship. The result is: "Lifeboat and its davit should be improved more and that Liferaft proved to be more advantageous for victims in the case of great urgency."

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後進旋回中の船の転心について-II : 模型実験

久々宮久, 上村卓久, 諏佐敏行, 八田稔

原稿種別: 本文
1976 年 54 巻 p. 77-82
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.77

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One of the authors, H. Kugumiya, has continued to study the movement of a ship when she goes astern, especially the behavior of the pivot-point. He published a report of the results of ship's ex periments in 1974. In that report, he states as follows: (1) when a ship goes astern and turns, the pivot-point appears at the sternpart of a ship, and (2) the point is not fixed, but seems to move longitudinally with certain periods. We tried, this time, to find out the pivot-point, by making a model ship go astern. The experiments were held at the water pond of the University of Mercantile Marine, Tokyo in Aug. 1974. The model used is made of wood, and 1.85 meter of length. The data about the relative yaw angle, propeller R.P.M. and the angle of the rudder were sent to the shore by FM-FM telemeter system. The results are as follows: (1) the pivot-point exists at the sternpart of the model, and (2) it appears mostly between 0.3〜0.6 Lpp sternward from midship. These results agree fairly well with the results in the report of the prototype experiments above mentioned.

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港内進入波の計算について

桑島進

原稿種別: 本文
1976 年 54 巻 p. 83-91
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.83

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For the ship port, it is one of the most important purpose to prevent the wave penetration. Energy attenuation of penetrating waves in the port is very influenced by the arrangement of breakwaters. There are many constituents for the transformation of wave property in the port. We must consider the many phenomena for the calculation of waves, which are the diffraction, the reflection, the refraction, the bottom friction, the shallow water effect and the water breaking. For the regular waves, each phenomena has been analyzed theoretically and experimentally, and comparison of theory and reality has met with good results. The irregular penetrating wave which has a directional spectrum is made up of many compcnent waves, each of which has a certain frequency and direction. If we suppose, therefor, that each component waves has a general property of regular waves, we can take advantage of above results. Author developed the synthetic computer program to calculate the directional spectrum energy at any point of port, using above assumption. In this report, the method of conversion of traditional wave expression into the directional spectrum expression, the contents of formulation of wave phenomena, the procedure of calculation and some results of example calculation are described in order.

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多変量ARモデルによる船体運動と漁具との関係について

川島利兵衛, 天下井清

原稿種別: 本文
1976 年 54 巻 p. 93-98
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.93

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The authors have considered that the variations of a warp tension in trawl fishing by a stern trawler are due to 6 degrees of freedom motions of a ship in a seaway and its influence on the formation of trawl nets during fishing operations. The authors described and discussed about this problem, using the statistical analysis of a ship's motions and the variations of warp tensions as stationary time series, up to this time. In this paper, the authors studied about the above mentioned relation by the analysis of a Multi-variate AR model method, by the use of AKAIKE's method and his program packages. As to the dynamical system of the ship's motions and warp tensions, the authors assumed the multi-variate model as follows ; [numerical formula] According to the above defined model, the authors applied this analysis to the measured data in trawl fishing on board the Oshoro Maru and the calculations were made on power spectra, cross spectra, partial and multi coherency and power contribution parameters and the results are shown in the paper and discussed. As to the results of the analysis, it was ascertained that the most part of the variations of warp tensions are due to 6 degrees of freedom motions of a fishing boat.

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船員志向意識の動態的研究-II : 海上定着者について

黒田隆

原稿種別: 本文
1976 年 54 巻 p. 99-106
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.99

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This study was designed to investigate above subject and compare with the data of the westages. The samples were 272. The method was used questionnaire by mail. The results were as follows: (1) The motivation of entering our university, 30% of samples were negative. This percetage is less than that of the westages. (2) Through the student life, 45% worried to go to sea. The percentage of this group is larger than that of the westages. (3) At the graduating stage, 14% felt conflict to be a seaman. There is no different tendency between the stayers and the westages. (4) The aspiration of the entrants of steamship company was separated into three groups: 57% were positive, 25% neutral, and 18% negative. In cosequence, the stayers' aspiration are more positive than that of the westages. (5) As to both the stayers and the westages, Deck part students had a positive inclination, and Engine part students a negative one. (6) In general, vocational attitude to be a seaman of the stayers was better than that of the westages. (7) But the sufferings of the stayers at sea were quite similar to the reasons of the westages to go to shore. There is some uneasiness that the stayers turn to the westages in the near future.

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船内騒音の統計的解析

小黒英男

原稿種別: 本文
1976 年 54 巻 p. 107-115
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.107

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For the purpose of studing the noise on board ships, it was analyzed the data that was investigated by the members of Special Committee on Noise in Accommodation Quarter of the Society of Naval Architects of Japan. The results are shown below. (1) The average noise level of engine room has no relation to the main engine power. (2) The noise level in engine room of Turbine ships has about 7dB (A) less than that of Deisel ships. (3) The arrangement of cabins on board ships will be considered in order to achieve the target noise level.

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論文集原稿執筆のしおり

原稿種別: 付録等
1976 年 54 巻 p. App2-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.App2

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講演用アブストラクトについて(論文審査内規抜粋)

原稿種別: 付録等
1976 年 54 巻 p. App3-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.App3

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奥付

原稿種別: 付録等
1976 年 54 巻 p. App4-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.App4

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裏表紙

原稿種別: 表紙
1976 年 54 巻 p. Cover3-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.Cover3

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CONTENTS

原稿種別: 表紙
1976 年 54 巻 p. Cover4-
発行日: 1976/01/20
公開日: 2017/01/15

DOIhttps://doi.org/10.9749/jin.54.Cover4

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