著者

和田 祐次郎 柴崎 隆一 小坂 浩之 渡部 大輔 伊東 弘人 坪田 建明 荒谷 太郎 泉山 卓 岩佐 竜至

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.34, pp.123-138, 2021 (Released:2022-02-28)

参考文献数

154

被引用文献数

1

---

By developing Automatic Identification System (AIS), vessel positioning and detailed movement can be understood in real time. Although vessel movement data including AIS have been conventionally utilized in suspicious vessel detection, collision avoidance, and vessel trajectory analysis, etc., this study focuses on the new application fields of vessel movement data including logistics, shipping, shipbuilding, environment, and cruise industry. In this paper, description of AIS data and literature review of each field are first summarized, then the results of the questionnaire survey to the industry and application service of AIS data are analyzed. Finally, the future prospects of research and application to the industry in the fields that the authors focus are summarized.

著者

岡畑 豪 藪下 和樹

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.26, pp.17-25, 2017 (Released:2018-03-03)

参考文献数

27

被引用文献数

2

---

We present a new method determining a form factor from resistance test results. The total resistance coefficient is approximated by a straight line and a polynomial expression in the present method. The straight line and the polynomial expression represent a viscous resistance and a wave-making resistance, respectively. It is shown that existing flat plate friction formulae are expressed as straight lines, and its inclination is only a function of the form factor. We determine the inclination (form factor) and coefficients of the polynomial expression by means of a linear least-squares method. The features of the present method are that: the form factor is decided without extrapolation; all measured data of resistance testing can be used in this analysis, although low-speed range data should be selected in the Prohaska's method. Using the ITTC57 correlation line, the values of the form factors obtained by the present method are almost the same as by Prohaska's method. It is found that the influence of the unreliable extra low-speed range data in the present method is less than in the Prohaska's method.

著者

小畠 かな子 有馬 正和

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.34, pp.115-122, 2021 (Released:2022-02-28)

参考文献数

7

被引用文献数

1

---

The ocean absorbs heat and carbon dioxide from the atmosphere and serves to mitigate rapid climate change caused by human activities. The ocean also has the function of maintaining natural cycles such as the oceanic general circulation, carbon cycle and providing us with fishery resources. A healthy, pollution-free marine environment is essential for the sustainable development of human society. However, global warming, ocean acidification, oxygen depletion, and accumulation of marine plastic waste are now facing serious threats to marine ecosystems. In order to conserve the abundant sea, it is very important to have a correct understanding of the ocean environment and marine ecosystem conditions over a long term and wide area. In this research, the authors assume the underwater glider with independently controllable main wings, SOARER developed at Osaka Prefecture University, and propose a threedimensional wide-area ocean observation strategy for Japan's Exclusive Economic Zone (EEZ). Several cases of underwater cruise simulation with swarm intelligent autonomous underwater gliders were carried out to estimate the required number of underwater gliders which cover the Japan's EEZ and to consider its validity and effectiveness.

著者

恩田 将維 和田 良太 尾崎 雅彦

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.32, pp.77-90, 2020 (Released:2021-04-02)

参考文献数

24

---

The purpose of this study is to investigate the feasibility of catenary chain mooring with sinker in the shallow waters of 50 to 100 meters depth facing the open ocean. Although the effect of the sinker can be expected to reduce the hardening nonlinearity of the catenary characteristics statically, it is necessary to consider the dynamic effects of sinkers ascending or sitting off the sea floor. As the procedure, we set the environmental design conditions assuming the coastal area of Japan and the semi-submersible type floating offshore wind turbine model, and perform static analysis to investigate the effect of parameters on the mooring characteristics, and then dynamic analysis to judge the strength feasibility of the mooring chains in storm conditions. Catenary theory is applied to the static analysis, and OrcaFlex is used for dynamic analysis to consider the interaction between the floating body, mooring system and sea floor in time domain. The pros and cons of using sinker in “Catenary chain with intermediate sinker type” and “Catenary with Hinged Arm Sinker Mooring type” are discussed to clarify the design considerations.

著者

谷口 智之 平方 勝 万 順一

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.33, pp.209-217, 2021 (Released:2021-08-31)

参考文献数

18

---

An automatic nesting algorithm based on deep reinforcement learning for shipbuilding is proposed. Automatic nesting method is desired because of the large number of parts to be placed. The nesting problem in shipbuilding is very difficult because of the relatively small area where they can be placed and the variety of shapes that can rotate freely. Since it is very difficult to manually create effective placement rules, this paper proposes an algorithm to generate rules autonomously based on reinforcement learning. To apply reinforcement learning to the nesting problem, we organized the problem as a Markov chain process. Based on deep q network, a type of reinforcement learning, we used the components of a real ship's block to learn the network parameters. The parts are represented in pixel format. It is confirmed that the present method was superior to the conventional method, and the results were comparable to those of a skilled person. However, for unlearned members, the results are inferior to those of the conventional method. This problem can be solved by relearning including unlearned components.

著者

川島 敏彦 西本 仁 土井 康明 陸田 秀実 松田 英揮

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.31, pp.1-14, 2020 (Released:2020-09-17)

参考文献数

13

被引用文献数

1 1

---

A small saury fishing vessel (19GT-type) is newly developed and evaluated the total performance in order to increase profits and to attract the younger generation of fishermen. On the basis of inquiring surveys to fisheries unions, ship-owners and shipbuilders, problems and needs of saury fishing vessels are analyzed. Then, the performance of conventional fishing vessels is evaluated through model resistance tests in a circulating water channel. The hull form design for the fore-body is improved by the use of wave-making resistance theory. The aft-body is improved by the use of the Eulerian scheme with the Lagrangian particles. The general arrangement of the hull form improved vessel is developed to upgrade the habitability and fishing performance. The newly developed and advanced small saury fishing vessel can reduce the fuel consumption by half compared to the conventional vessels. An actual 19 GT saury fishing vessel, constructed based on the results of this study by using the present design method, demonstrates the superiority of performance.

著者

寺田 大介 安川 宏紀 芳村 康男 松田 真司

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.30, pp.49-57, 2019

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<p>A roll response model during maneuvering, which can express a transient motion after steering, is proposed. The transient motion, namely the transition process from initial inward heel to outward heel, is used in the rudder–roll stabilization system. Nowadays, the model reference control is well used as an autopilot system of the actual ship. As to the model, the yaw response model such as the K–T model proposed by Nomoto is used because of the convenient adjustment of parameters. However, there is not the roll response model to be able to use for the rudder–roll stabilization. In this study, the 4th order roll response model proposed by Yasukawa and Yoshimura which was obtained from the 4 degrees of freedom (surge-swayroll- yaw) mathematical maneuvering model is focused on. And it is called as the Y–Y model in this study. Firstly, assume that the change of the rolling against steering is gradual, the Y–Y model is approximated by the 2nd order. Moreover, the modeling is done by considering the fact that the rolling due to steering is a non–minimum phase system. In order to verify the effectiveness of the proposed model, the numerical experiments were carried out. The KCS container ship was selected as the sample, since there is the information of maneuvering derivatives, which was obtained by the captive model experiments, including the effect of rolling. As the result, it can be confirmed that the proposed model can be expressed rolling in the transient situation after steering well under the assumption used in the modeling of Y–Y model. Furthermore, the procedure to estimate the parameters is also proposed by using the measured onboard monitoring data, and the effectiveness is confirmed based on the numerical experiment.</p>

著者

溝上 宗二 黒岩 良太

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.29, pp.1-9, 2019 (Released:2019-09-25)

参考文献数

13

被引用文献数

2

---

The authors verified an energy saving effect of an air lubrication system for the domestic service ferry which was one of slender body ships. The energy saving effect was evaluated by the engine output reduction rate of system ON and OFF at speed-trial test. As the result, a net energy saving effect of about 3.7% was confirmed.After that, long-term voyage monitoring had been conducted since the ship was in service. At the same time, monitoring had been conducted about same type of sister ship without air lubrication system, in service on the same route.The investigation result of the energy saving effect by comparison of fuel consumption of both ships, a net effect of about 3.13% was confirmed. According to these results, the effectiveness of an air lubrication system for slender body ships was proved; therefore, scope of an air lubrication system as energy saving system of ships had expanded.

著者

柴田 和也 越塚 誠一 酒井 幹夫 谷澤 克治 辻本 勝

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.11, pp.125-136, 2010 (Released:2011-01-28)

参考文献数

19

被引用文献数

1

---

A transparent boundary condition was developed for calculating water waves propagating to a distant area by using a particle method. In front of the boundary, the incident waves were analyzed by Fourier analysis, and the particles on the transparent boundary were forced to move to absorb the incident waves. The characteristics of this study are to introduce the technique of wave analysis used for the wave tanks to the particle simulation and to reduce the calculation cost by employing an inflow and outflow boundary. Water waves were calculated in two wave periods by the developed transparent boundary condition. As the results, it was shown that this transparent boundary transmitted the incident waves without the reflection waves. It was also shown that the calculation cost was smaller than that of the ordinary high viscosity boundary condition.

著者

丹 康弘 タン ジュークイ 石川 聖二

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.21, pp.75-81, 2015 (Released:2015-10-15)

参考文献数

17

---

This paper proposes a high-precision real-time correction sounding system using Micro Electro Mechanical Systems (MEMS) inertial measurement units, which can correct the effective depth from the sea surface to the seabed in real-time. The advantages of the proposed system are as follows: (1) The system outperforms a single-beam sounder available on the market in that the range of depth errors caused by the swing of a research vessel is about 2%: (2) Since the proposed system is small compared to the existing attitude and heading reference system, it can be employed for unmanned surface vehicle, remotely operated underwater vehicle, autonomous underwater vehicle, and so on. Experimental results show that an attitude, heading and depth measured by the developed system are within the acceptable range, and the system can give a stabilized attitude, heading and depth information for a long time.

著者

佐久 間俊 成瀬 俊宏

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.22, pp.229-233, 2015 (Released:2016-02-29)

参考文献数

6

被引用文献数

1

---

This report deals with the stability of ships having comparatively large projected lateral area above water line and shallow draft. Such ships usually have wide breadth because they have tendency to raise their center of gravity. Large GM made by the wide breadth brings strong stability. But it gets weaker if the ship has higher center of gravity because GM/(OG+T/2) becomes smaller. A research challenge of this report consists of the procedure to clarify the acceptable center of gravity and how breadth and draft to be examined and determined. These procedures enable the optimization method in the initial design. In the analysis, the metacenter is estimated by Ohgushi’s and Morish’s formula and the accuracy of the estimation is confirmed using merchant ships’ data released for public. The present method obtained by the analysis shows effectiveness to find out reasonable dimensions and acceptable height of center of gravity in the early stage of ship design.

著者

辰巳 晃 藤久保 昌彦

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.24, pp.189-198, 2016 (Released:2017-02-24)

参考文献数

9

被引用文献数

3

---

This paper is the first of two companion papers dealing with ultimate longitudinal strength analysis of a container ship considering local loads effects. The purpose of this paper is to clarify the effect of bottom local loads on the longitudinal bending collapse behavior of a large container ship. An important problem is a bending deformation of the double bottom due to upward bottom local loads that may reduce the hull girder ultimate strength.A 1/2+1+1/2 hold model of a container ship is analyzed using nonlinear implicit finite element method. The analysis shows two major effects of the bottom local loads on the ultimate hull girder strength; i.e. the buckling of the outer bottom plating is accelerated due to the increased longitudinal compressive strain, while the effectiveness of the inner bottom plating that is in the tension side of local bottom bending is significantly decreased.

著者

中村 昌彦 百留 忠洋 笠谷 貴史 岩本 久則 大田 豊

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.29, pp.89-102, 2019 (Released:2019-09-25)

参考文献数

11

---

“YUMEIRUKA" is an AUV that Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has developed and is operating. A seabed resource exploration is carried out by two-set simultaneous operation with AUV “JINBEI" developed by JAMSTEC. “YUMEIRUKA" towing a sensor cable, and the cable is oscillated by the AUV. The up-and-down oscillation of the sensor has a bad influence on the exploration result. Therefore, in order to perform accurate seabed resource exploration, it is necessary to comprehend the motion of the sensor cable and to optimize it. In this paper, motion simulations of a sensor cable towed by X rudder AUV “YUMEIRUKA" are shown.

著者

貞本 将太 田中 智行 岡澤 重信

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.19, pp.169-178, 2014 (Released:2014-08-28)

参考文献数

17

被引用文献数

1 1

---

A geometrical nonlinear formulation is presented to simulate buckling/post-buckling behaviors of panels in ship structure employing meshfree approach. Reproducing kernel is adopted in the meshfree approximation. The author's previous study,a meshfree flat shell formulation, was developed based on Mindlin-Reissener theory. However, there were difficulties in introducing initial imperfection to the flat panel. In this study, convected coordinate system is applied to the meshfree shell formulation to reproduce complicated initial imperfection, e.g., thin-horse mode. To verify the proposed approach,buckling/post-buckling behaviors of panels are simulated using total and updated Lagrangian formulations and the results are examined.

著者

中村 昌彦 浅川 賢一 渡 健介 百留 洋洋 川谷 哲也

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.19, pp.213-226, 2014

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A prototype of a 3000m-class underwater glider for virtual mooring is being developed by JAMSTEC (Japan Agency for Marine-Earth Science and Technology) with RIAM (Research Institute for Applied Mechanics) of Kyushu University. The vehicle houses an observation equipment and glides back and forth between the sea surface and the seabed collecting ocean data in a specific area (virtual mooring area) for more than one year. This paper summarizes our restudy on the hydrodynamic coefficients of the vehicle by constant acceleration tests and the simulated results of gliding angle control are compared with the experimental results carried out in a towing tank.

著者

佐藤 徹 大宮 俊孝

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.8, pp.9-16, 2008 (Released:2009-03-24)

参考文献数

20

被引用文献数

1 1

---

To mitigate the global warming and ocean surface acidification caused by increase of atmospheric CO2 concentration, ocean sequestration of CO2 has been proposed. Because the technology has risks on deep-ocean ecosystems, its implementation needs public acceptance. In such a process, environment assessment indices are useful for making decisions. Recently, the Triple I was developed to show totally inclusive index for environmental and economical matters, consisting of ecological footprint, ecological risk, human risk, cost, and financial benefit. The present paper presents the Triple I for CO2 ocean sequestration, where the object of comparison was set to be the effects of ocean surface acidification and its consequent impacts in the deep ocean. Particularly focused on in this study was the calculation of ecological risk. In general, risk is represented by the products of probability and hazard. Here, the former was obtained by a semi-quantitative probability method based on the results of expert enquiry; the latter was converted to land area by using the species-area relationship. The resultant Triple I became negative and indicated that the technology is worth to implement. Also elucidated is that the ecological footprint and the ecological risk had the largest and the smallest portions, respectively, in the index.

著者

増田 光弘 南 清和 増田 光一 居駒 知樹

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.19, pp.61-68, 2014 (Released:2014-08-28)

参考文献数

13

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When the tsunami attacks in harbors, the vessels moored at a wharf may be unable to be evacuated. For example, it may happen the situations that the vessel is under cargo handling, the vessel has no crew or only foreign crew without knowledge of tsunami. In such a case, the following damages are assumed; breaking the mooring tether, grounding on a wharf, drifting to land areas and destroying buildings. This present paper describes the tsunami simulation and the motion analysis of vessel moored at a wharf using the MPS method (Moving Particle Semi-implicit method).In this research, the 3D-MPS method is applied. The chart of break of mooring tethers was created. The wave height of tsunami, draft of vessels and the relation of the break of the mooring tether were shown by the chart of break of mooring tethers. Then, the chart of break of mooring tethers is proposed for various scale of tsunami including the effect of incident angle of the mooring tether can be easily estimated against to the scale of tsunami and mooring system.

著者

増田 光弘 南 清和 増田 光一 居駒 知樹

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.25, pp.183-190, 2017 (Released:2017-09-06)

参考文献数

9

被引用文献数

1

---

When tsunami attacks a harbor, the vessels moored at the wharf are exposed to a risk. For example, the following damages are assumed; breaking the mooring tether, grounding on a wharf, drifting to land areas and destroying buildings. In the previous report, the motion analysis of mooring vessels in tsunamis and the usefulness of tsunami protection measures by the install more mooring tethers (IMMT) was described using the MPS method. The incident wave angles of tsunami were used the 0 degrees (longitudinal wave) and 90 degrees (Transverse wave). For any incident angles, IMMT was effective. However, in the case of transverse wave of wave height 6.0m or more, it is possible to prevent the break of the mooring tethers, but it was confirmed that the vessels damaged by the grounding on a wharf. In the case of longitudinal wave, IMMT confirmed that it did not affect in some cases. It is influenced by the direction the mooring tether pulls. When the vessel moves, there are mooring tethers that are pulled or slacked. As a result, the mooring force does not act equally on the mooring tethers. Also, as an issue of existing papers, studies on oblique waves were not done. It is important to solve these issues.In this present paper, the influence of the oblique wave is studied. The extent of damage of longitudinal waves, transverse waves and oblique waves are compared through a numerical simulation method, the 3D MPS method. The 3D MPS method is used for numerical simulation. In this paper, quaternion is applied to the algorithm of rotational motion of the floating model. Furthermore, a more effective mooring method for longitudinal wave is proposed, and its effectiveness is demonstrated.

著者

櫻田 顕子 枌原 直人 黒田 麻利子 辻本 勝 杉本 義彦 長谷川 健

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.25, pp.33-38, 2017 (Released:2017-09-06)

参考文献数

8

被引用文献数

2

---

Recently enormous amount of data can be obtained from running ships, so that the needs of the analysis of the data are increasing. For the analysis, the relationship among ship speed, engine revolution and engine power in calm sea is important. In order to estimate the relationship accurately, data in calm sea distributed widely in terms of ship speed are necessary, but ship speed does not change much in some voyages. In the paper, The method of correction for the displacement using Admiralty coefficient and weather correction method is explained to obtain more accurate relationship among ship speed, engine revolution and engine power in calm sea. Using the methods, the voyages of different displacements are investigated and the range of application of Admiralty coefficient is revealed.

著者

安川 宏紀 中村 暢昭

出版者

公益社団法人 日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 = Journal of the Japan Society of Naval Architects and Ocean Engineers (ISSN:18803717)

巻号頁・発行日

no.6, pp.313-321, 2007-12-01

参考文献数

14

被引用文献数

3 1

---

An analysis method is presented to know whether a towed ship is stable or not in the course stability in wind. The method is based on the linearized motion equations newly derived in this paper for the towed ship. The special feature is to take the effect of hull steady condition of the towed ship in wind into account. By means of the analysis method, the wind effects on the course stability of a towed barge were investigated. The course stability recovers in the range from beam to quartering wind even if the towed barge is unstable in no wind case. Namely, the barge is stably towed with keeping the certain heading/drift angle in the beam/quartering wind. On the contrary, the course stability reduces in head and following winds with higher speed even if the towed barge is stable. We found that the course stability of the towed ship is much affected by the hull steady condition in wind. The analysis results agreed well with the simulation results by a nonlinear time domain method. The present analysis method is useful for better understanding of the course stability of the towed ship in wind.