-
Article type: Cover
1987 Volume 77 Pages
Cover1-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1987 Volume 77 Pages
Cover2-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Masayoshi KUBO, Tatehiko MIKI, Akio IMAI
Article type: Article
1987 Volume 77 Pages
1-10
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Containers usually receive various types of impact forces on the way of distribution. Packaging of the container cargoes is designed to withstand these impacts. So it is important to obtain the exact impact load factors in distribution. Nevertheless, the studies are very few and the old data of impact load factors are not presented for various type of containers. As it is reported that containers receive strong impact at ship's loading, field experiments respecting the vertical impacts are carried out by using eight types of containers. Some interesting results are explained in this paper.
View full abstract
-
Masanori ISHIZUKA, Kohei OHTSU
Article type: Article
1987 Volume 77 Pages
11-20
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Ship's Seamargin are essential for ship's operator, owner and builder to obtain the optimal fleet, management and plan. In this paper, the authors tried to estimate the statistical structure of the every day data Power Seamargin in the Pacific southwest service container ship ship from her Abstract logbook. The model which is used in this paper, SEAMARGIN=Const.+(Aging effect)+(Fouling effect)+(Seasonal effect)+(Weather effect)+(Time series effect)+Noise The model is determined by the Minimum AIC Procedure. According to such an analysis, the following results are gained, namely, 1) The aging effect which can not recover even after a dock repairing, is estimated to be 4.2% (per year). 2) but the fouling effect which can recover after it, to be 0.8% (per year) of which value is small comparing with that of the data in the Persian Gulf. 3) The seasonal effect is estimated to obtain a strong one in winter season.
View full abstract
-
Kazuo HITOMI, Osamu MIYATA, Osamu NAGATA
Article type: Article
1987 Volume 77 Pages
21-32
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
The crew possibly have the chance to be obliged to escape from ship by a shipwreck. Then, they will find themselves in the sea water where they must stay afloat until rescued. Sometimes, they may lose their lives on the sea. In order to keep safety of life and investigate effective use of lifesaving appliances, the database on shipping casualty are developed and analyzed by some statistical method. Ploblems such as how to collect and process basic data, and how to analyze the stored data by computer systems, are reported in the present paper.
View full abstract
-
Masayoshi KUBO, Shunsaku OKAMOTO
Article type: Article
1987 Volume 77 Pages
33-46
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Recently, the time domain analysis with the retardation functions becomes important in the research of moored ship motions. The hydrodynamic coefficients are required in the whole range of the frequency to calculate the retardation functions. There are few examples of the three dimensional floating body moored along a quay wall, and moreover those calculations are not satisfactory. In this paper, the calculation methods are proposed to improve the accuracy of the hydrodynamic coefficients and the retardation functions.
View full abstract
-
Michitoshi ISOZAKI, Hisashi KUGUMIYA
Article type: Article
1987 Volume 77 Pages
47-55
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
There are many works of handling ropes on board. And it is very dangerous to handle ropes when they are stretched tightly, because if they are to be cut, they fly rapidly towards the other point where the rope has been tied and are apt to cause the serious disaster. But the motions of these ropes have not thoroughly clarified yet. We studied the phenomena using high speed photography. The camera can catch the motions every 2.5ms and we arranged the mirror to be able to get the phenomena in the vertical plane as well as in the horizontal one. The summary of the results are as follows: (1) Each area, which is to be drawn connecting maximum horizontal deviation of a flying rope, has a particular character defined by its twist. (2) Deviation, from where the rope is originally fastened, does not depend on the length of rope. (3) Relation between the shape of flying rope and its speed is clarified. (4) Flying speed of a broken rope depends on its potential energy and can be estimated by its tension given prior to the snap.
View full abstract
-
Tsuneo SUZUKI, Haruo SATO
Article type: Article
1987 Volume 77 Pages
57-68
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
The authors investigated the submarine deposits in both Ise Bay and Atsumi Bay to find out the relation between the nature of the deposits and the holding power of an anchor. As a result, it was found that the holding power relates to the grain size of the deposits and that it increases as the deposit grain becomes coarser. When the grain size of the deposit was represented by three kinds of factors, i.e. mud content, Mdφ and Mφ, it was found that the correlation coefficients to the holding power (Eq.s (1), (3) and (4) in this report) were almost the same for each factor. Therefore any one of the above factors may be used as the criterion for the holding power of an anchor. It is considered, however, that it is unbiased to employ either Mdφ or Mφ, each of which fully takes into account the grain diameter, instead of the mud content. Fig.7 shows the holding power of an anchor expressed in terms of Mdφ in both bays. Collating these results with the sea chart, we can see that the points with bottom-material-notations of "S" or "S.G" give the good holding power. However, it should be noted here, that when the anchor flukes face upward the holding power decreases as the deposit grain becomes coarser, contrary to the above. (Refer to Fig.7.) In addition, when the holding power of an anchor is evaluated based on the grain size, the locality characteristics varying depending on the depositing circumstances should be examined for each bay, because it is considered that they also affect the holding power.
View full abstract
-
Hayama IMAZU, Takeo KOYAMA
Article type: Article
1987 Volume 77 Pages
69-75
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
It is necessary to study about appropriate ship manoeuvring system, which are the manoeuvrability of ship and the shipboard manoeuvring data for a safety navigation. First, the safety navigation system as composed of ship, environment and navigator, was defined. And the ship manoeuvring system was located as a part of this system. Next, the problems of a ship manoeuvring system which has encountered with accident, were examined by shipping casualty data analysis. Consequently, some improvements of a ship manoeuvring system were presented.
View full abstract
-
Tadashi NARITA
Article type: Article
1987 Volume 77 Pages
77-89
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
This is a continuation to the preceding report VI, and treats the following three items: (1) Theory of the type I (1SD) mechanization. (2) Theory of the type IN (SD) mechanization. (3) Theory of sign monitoring of a^n_x (the east-west component of specific force vector α). Items (1) and (2) involve the methods of calculating the geographic coordinates, and item (3) is related to all three mechanizations hitherto described, namely, those of types NS (SD), I (1SD) and IN (SD).
View full abstract
-
Kiyohiro SANADA, Heiichiro ANDO, Yasubumi KANAI
Article type: Article
1987 Volume 77 Pages
91-101
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
For developing a low-cost and simple reception system of satellite-broadcasting on board, an antenna tracking mechanism using a two-axis rotator is desired. On board of the Training Ship "Hokutomaru" (of Institute for Sea Training of Japan) cruising around Honshu and to Ishigaki Island, some receiving tests were carried out and the results are shown as follows. a) Around Ishigaki Island, good television pictures were received by a parabolic antenna of 75cm in diameter on condition of no precipitation, while it has been said that a larger size antenna is required. b) Around Honshu and near-by Okinawa Islands, the present tracking system worked successfully on moderate sea conditions up to rough sea. The results suggest following parameters to design low-cost reception systems. a) A parabolic antenna of 75cm in diameter is recommended practically for ships cruising around Japan proper. b) Two-axis tracking mechanism may be applied, which is able to rotate the antenna faster than 10deg/s. c) On the worse sea conditions than rough sea, hybrid tracking algorithm should be studied, combining informations given by a simple rolling-and-pitching sensor and AGC level of a receiver.
View full abstract
-
Sakae NAGAOKA
Article type: Article
1987 Volume 77 Pages
103-113
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
A mathematical collision risk model is available for evaluating the safety of air route systems. The model requires several parameters associated with navigational accuracies of aircraft. This paper estimates the probability of lateral overlap of pairs of proximate aircraft, which is one of the key parameters of the model, or a given lateral separation minimum. The method of estimation is based on the interpolation of a fitted curve to the empirical distribution of relative lateral distance (=the difference between lateral deviations of a pair of aircrft) obtained by a height finding radar. The curves are determined by using the minimum AIC (Akaike Information Criterion) estimation techniques for several probability density function (pdf) models. The results of analyses show that the pdf of relative lateral distances may be approximated by a family of the double-double exponential (DDE) distribution. The estimated probability of lateral overlap for the same assigned route, Py(0), is 3.00×10^<-2> under observational conditions.
View full abstract
-
Naoto SATO, Minoru TANAKA, Kiyoshi HARA
Article type: Article
1987 Volume 77 Pages
115-123
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Authors improved the marine traffic survey system using radar and developed an automatic processing system using ARPA (Automatic Radar Plotting Aids) for analysis of marine traffic. These systems provide a hard copy of an image on a radar PPI on real time at an arbitrary time interval and semi-automatically analyze a marine traffic situation. The proposed traffic survey system consists of a color radar, a video printer and modulate and demodulate equipments to record raw radar signals into VTR. The automatic processing system consists of a personal computer and ARPA linked with the survey system. These systems were applied to the marine traffic survey in Akashi channel in order to realize its validity. Then there were much improvement on increasing the accuracy of observed data and significantly reducing working time on the steps of the analysis comparing with the conventional way. The data in a personal computer linked with ARPA make us easy to analyze the marine traffic from various points of view.
View full abstract
-
Nobuo ARIMURA, Kazunari YAMADA, Nobumochi SHIOTA, Koji OHTANI
Article type: Article
1987 Volume 77 Pages
125-132
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
A Ship survey was made on evasive actions and mental load on board the Seiunmaru aiming to decrease the load at evasive action in congested waterways. Here, analysis is made on the relation of the Collision Judgement Index and human reactions, the former having been proposed by Kobayashi and Endo. It gives results as following: (1) The upper limit of the Collision Judgement Index at starting time of evasive action is approximately equal to 100 (×10^<-4>) and most of DCPA is less than 500m (=5L, L*ship length). Almost all evasive action are finished before TCPA reaches 2 minutes which roughly corresponds to 7L. (2) The frequency of heart pulse increases by 26±5% from the ordinary value which indicates increase of mental load. Above consideration leads a proposal to display an equialtitude map which enables quick look of the Collision Judgement Index.
View full abstract
-
Saburo TSURUTA, Hisashi MATSUMURA, Masaaki INAISHI, Hayama IMAZU, Akio ...
Article type: Article
1987 Volume 77 Pages
133-139
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
This report is concerned with an Expert System for Collision Avoidance, as one sub system of an Expert System for Navigation at sea, while an expert system for coping with collision accident was developed as one of the sub system last year, in 1986. In this report, the authors have dealt with the collision avoidance facility in order to generalize the system. The purpose of this system is to provide a captain or a navigator with consultative advices to avoid collision. Two methods to represent the risk level of collision are used; one is the method by the rule-of-thumb and the rule of the Regulations for Preventing Collision at Sea, and the other is the method using the value of TCPA and DCPA. The results of experimental simulations of this system may be summarized as follows. (1) Actions shown by this system to avoid collision agreed approximately with the rule-of-thumb. (2) The time required for one series of inference and display is about 20 seconds per one target.
View full abstract
-
Mitsuo YOSHIDA, Takashi KURODA, Norikazu OHNISHI
Article type: Article
1987 Volume 77 Pages
141-149
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Methodological examination was made about the results of image surveys by SD (semantic differential) method concerning homogeneity of items and groups. The neutral category of "neither" was examined whether its observed frequency was larger than the expected, obtained by fitting logistic curve on cumulative frequencies. As to groups, three parameters or moments of their distributions, variance, skewness and kurtosis, were calculated to compare response patterns. The Indonesian samples showed almost the same factor structure as those of Japan after procrustes rotation.
View full abstract
-
Hisashi MATSUMURA, Akio M. SUGISAKI
Article type: Article
1987 Volume 77 Pages
151-161
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
The Report of Judgement on Marine Accident Inquiry Agency is indispensable for investigating the disasters which occurred at sea and is plenty of contents in each case. For effective and efficient use of The Report, the authors have discussed that an introduction of Relational Database System is an adequate method. The Database System is written in Prolog on the personal-computers, and consists of knowledge base, explanation, retrieval and interfaces. According to the operation of system in using about 400 cases, it is said that the users will be probably lightened of their researching materials at this system.
View full abstract
-
Masanori TSUGANE, Hiroaki KOBAYASHI
Article type: Article
1987 Volume 77 Pages
163-173
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
The influence of trim over a ship's propulsion is an unsolved question. Ship operators have often tried to define what it is, but no satisfactory answer to the question has ever been proposed. In order to pin down this influence, authors conducted various tests through two types of model ship (CTNR and PCC) and obtained the following facts, with which a system of finding optimum trim was developed. (1) The influence was recognized. (2) The influence depends on ship's design, displacement and speed; then the optimum trim exists according to operation conditions of each ship. (3) With CTNR ships in light condition, trim by the head saves more fuel oil than that by the stern. (4) Model tests and actual ships tests are very effective in this study. The thanks of the authors are particularly due to the twenty one captains for their statistical reports that proved useful in the preparation of this study.
View full abstract
-
Kiyotaka TANAKA, Yoichi TOYOMIZU, Hiroaki KOBAYASHI
Article type: Article
1987 Volume 77 Pages
175-183
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
The paper deals with the change of maneuverability of the ship with C.P.P. (Controllable Pitch Propeller) reducing to low speed. On a experiment method, Series-60 model ship with C.P.P. was used and sway force and yaw moment etc. induced on the hull & rudder were measured in condition of steady-state for propeller pitch angle 20°, 10°, 5°& 0°. It is confirmed from experiment that decreasing propeller pitch angle, yaw damping force acts on aft point of sway damping force and the ship is in unstable condition. And authors proposed the method of maneuverability that the ship reduced to low speed under keeping course stability.
View full abstract
-
Tatsuro Matsuoka
Article type: Article
1987 Volume 77 Pages
185-197
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Traditional canoes are widely operated in South Pacific island countries even nowadays. Those canoes are attempted to be utilized as fishing boats in coastal fisheries development. The study aims to assess adaptability of traditional canoes as fishing boats in modern fisheries. This paper deals with structural characteristics of canoes from a view point of fishing vessel technology. A field survey on traditional canoes was conducted in northern Papua New Guinea in 1985. Eight canoes from six villages in various provinces were measured to draft lines and general arrangements. Dimensions, loading capacity and structure were analyzed along with 87 other canoes recorded. Two types of canoes were observed, i.e. a single-outrigger type and a non-outrigger single hull type. The former is common while the latter was found only in the Sepik River region. Details of design vary from region to region. Canoes have small loading capacity, about 200 kilogrammes (kg), although they have light weight and large horizontal dimensions. This allows only two men and small tools on board in fishing. Most canoes have small depth and freeboard. Weaknesses of the traditional design are in such parts as connections of the outrigger, booms and the main hull. Magnified torque is suspected to work upon these parts in bow and quartering seas, which appears due to large transversal dimension. This presumption is supported by many canoes abandoned because of destruction of those connection parts. The observed canoes are not suitable for use in modern coastal fisheries, which need relatively heavy gear and are conducted in open seas. Useful life is not very long due to structural weaknesses. Even the low building cost of a canoe may not be advantageous from an economic view point. Thus these canoes may only receive limited use in modern coastal fisheries.
View full abstract
-
Toshihide KATSUKI
Article type: Article
1987 Volume 77 Pages
199-208
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
Navigation of the Seikan Renrakusen, other ferries and general vessels has been susceptible to the complicated oceanic and tidal currents which are caused by the Tsugaru Warm Current, a branch of Tsushima Warm Current, flowing in to the strait. Meanwhile, the estimated velocities by Ogura's method which has been so far used for the currents in this strait are very different from the observed one. So, a new method using C.A.S (Collision Avoidance System) were tried and got the good results for the estimation of currents at real time. With this results, the efficient diagram of navigation for ferrey service based on the adjustment of ship's velocity according to the current in main path are devised. Efficient use of this diagram enables us to accurately forecast the pass time at each point in the Tsugaru Strait between Aomori and Hakodate. A new method for the estimation of currents and a usage of the diagram are presented in this paper.
View full abstract
-
Article type: Appendix
1987 Volume 77 Pages
App1-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1987 Volume 77 Pages
App2-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1987 Volume 77 Pages
App3-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1987 Volume 77 Pages
App4-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1987 Volume 77 Pages
App5-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1987 Volume 77 Pages
Cover3-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1987 Volume 77 Pages
Cover4-
Published: September 25, 1987
Released on J-STAGE: January 15, 2017
JOURNAL
FREE ACCESS