著者

鈴木 英之 柴田 創 藤岡 弘幸 平林 紳一郎 石井 希実子 菊池 紘樹

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.18, pp.81-90, 2013

被引用文献数

3

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Rotor-floater-mooring coupled response analysis is essentially important for design of Rotor Nacelle Assembly (RNA) and floating support structure of Floating Offshore Wind Turbine (FOWT). The authors have developed an analysis code UTWind for the analysis of the coupled response. Blades and floater are modeled as frame structure with beam elements. Lumped mass model is use for mooring. Aerodynamic load on blade is calculated by Blade Element Momentum Theory (BEM), and hydrodynamic load is calculated by Hooft's method, and Morison equation was modified to be applicable to cylindrical element with cross section with two axes of line symmetry. The equations of motion of rotor, floater and mooring are solved in time domain by weak coupling algorithm.The numerical results by the code were compared with experimental results in wave and wind-wave coexisting condition with/without blade pitch control and showed good agreement. Response by negative damping was reproduced by the code and showed good agreement with experiments.

著者

惠藤 浩朗 佐藤 千昭 増田 光一 居駒 知樹 清水 研 畔柳 昭雄 山口 順子

出版者

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.245-253, 2014 (Released:2014-08-28)

参考文献数

18

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An innumerable number of buildings in the coastal part of the east side of Japan were devastated by the Great East Japan Earthquake and Tsunami. Medical institutions also suffered the damage caused by tsunami, and the function to carry out the medical act has been spoiled. And the disabled concentrated on the medical institution which avoided tsunami damage. Under such circumstances, assistance from the water area began three days after the earthquake disaster, and much support supplies reached the stricken area. It was revealed that the support from the water area including the river was extremely effective against the stricken area.And then, the Tokyo Inland Earthquake disaster was assumed, floating medical support system installed in the quay of Arakawa River in Tokyo was proposed. Floating medical support system is movable; furthermore, it is built in the structural system of having very high isolation characteristics. Therefore, feasibility study such as selection of suitable setting position of this floating structure on Arakawa River, floor planning and flow planning at the time of always and a disaster, facilities and storage of various material,structural strength of the floating base, and the effects of disaster risk reduction was carried out about floating medical support system.

著者

中村 昌彦 百留 忠洋 吉田 弘 青木 太郎

出版者

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.9, pp.139-153, 2009 (Released:2009-10-08)

参考文献数

12

被引用文献数

4

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A small AUV "MR-X1" was developed in 2000 for detailed investigation of the seafloor and marine organisms at JAMSTEC (Japan Agency for Marine-Earth Science and Technology). In order to assure high maneuverability under low-speed cruising and good hovering performance, the motion of the vehicle is controlled by five thrusters. When the vehicle was built, PID control was implemented, but in order to improve control performance, renovation of the vehicle operating system has been ongoing since 2007, and a model based control (LQI control) is due to be adopted when this is complete.The paper summarizes the mathematical model of the vehicle and the design method of the motion and path controller, and shows successful numerical simulated results.

著者

中村 昌彦 梶原 宏之 稲田 勝 原 正一 星野 邦弘 黒田 貴子

出版者

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.4, pp.95-105, 2006 (Released:2007-04-06)

参考文献数

6

被引用文献数

2

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Recently, in domestic shipping, a shortage of crew members resulting from the severe labor environment and the aging of members are serious problems, and there is concern about stable transportation becoming difficult because of this. The hiring of younger crew members by improving the labor environment and reducing the labor load is therefore an important target. The automatic mooring is one means of mitigating the labor load of standby operations. If the shift of the mooring tension induced by tide level change and the draft change while loading can be prevented, and moreover, if the hull position can be kept automatic within the allowable limit, the labor load can be reduced. In this research, a simulator which calculates mooring tensions and ship motions was built first, and calculation accuracy was checked by model experiments. The controller was then designed using the simulator and the performance was verified by tank tests. Successful results are shown.

著者

安川 宏紀 平田 法隆 中村 陽昭 松本 之良

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

no.4, pp.137-146, 2006-12

被引用文献数

6

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A simulation method for the maneuvering motion of a towed ship in still water is presented. A 2D lumped mass method is employed for expressing the dynamics of the towing cable. The motion equations of the towed ship and the cable are derived under the assumption that the motions are defined in the horizontal plane. Motion of a towing ship is assumed to be given. As a calculation example, a towing barge with/without skegs is selected. The captive model test is carried out to capture the hydrodynamic force characteristics of the barge. Using the force characteristics, simulations are made for various towing speeds, towing cable lengths and so on. The calculated results are compared with the model test results conducted in the towing tank. The results of the slewing motion frequency, changes of heading angle and yaw rate in time domain agree well with the experiments. The present method is useful for predicting the slewing motion of towed ship.

著者

木下 健 高木 健 寺尾 裕 井上 憲一 田中 進 小林 顕太郎 山田 通政 高橋 雅博 植弘 崇嗣 内山 政弘 江嵜 宏至 佐藤 増穂 岡村 秀夫

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

no.1, pp.43-53, 2005-06

被引用文献数

2

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The present paper proposes a Sailing Wind Farm as main energy resource with small load on an environment. It sails around EEZ of Japan seeking appropriate breezing and avoiding meeting heavy storm like Typhoon. This is a concept of main energy resource of Japan to minimize environmental load when fuel cell and hydrogen will be available for daily life. A prototype design shows feasibility of safe sailing even in case of Typhoon and structural strength in storm. If Sailing Wind Farms, 3900 units of the prototype replace coal power plants, then we can obtain 18% of total electric power generation of Japan and reduce 10% of exhausting CO_2 of the 2002 level.

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

no.3, pp.303-304, 2006-06

著者

尾崎 雅彦 南浦 純一 太田 真 佐々木 裕一 松浦 正己

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

no.3, pp.87-95, 2006-06

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Ocean storage of the captured CO_2 from fossil-fuel burning is a possible option for mitigating the increase of CO_2 concentration in the atmosphere. Moving-ship type of CO_2 ocean storage is a concept whereby captured and liquefied CO_2 is delivered by ship to a site and injected into the deep ocean by means of a pipe suspended beneath a ship as it slowly moves through the water. In case of bad weather conditions, CO_2 marine transport and operation on the sea should be adjourned although CO_2 would be captured at the plant every day. It is, therefore, required that the system would have the buffer storage at the port and the extra shipping ability to recover the delay of schedule. Since the large scale of such spare capability might lead to the increase in cost, it is needed to investigate how to plan the system allowed for weather conditions reasonably. In this study, a time series model of sea state through one year is generated for a hypothetical ocean storage site, based on the wind data observed with satellite remote sensing, and simulations of CO_2 marine transport and operation on the sea are carried out considering the operational limit of sea state. In this approach, the continuing bad weather days or the frequent occurrences of rough sea condition during the specific season are counted automatically. In order to pursue higher efficiency of the operation, side-by-side type and tandem type of moorings are applied for the simulations and compared. Finally, cost assessments under the several assumptions are carried out to see the relative merits among that the number of ships would be increased, that the loading capacity of a ship would be increased, and that the storage capacity at the port would grow, which are generally in trade-off relationships.

著者

池平 怜史 木村 元

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

no.9, pp.223-229, 2009-06

被引用文献数

1

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This paper presents an automatic design algorithm for pipe arrangement based on equipment arrangement figure and pipe diagram. Firstly, a pipe arrangement design problem is proposed for a space in which pipes and objects co-exist considering branches of the pipes and valve arrangement. This problem includes large-scale numerical optimization and combinatorial optimization problems, as well as peculiar characters of pipe arrangement design. For these reasons, it is difficult to optimize the problem using usual optimization techniques such as Random Search. Therefore, secondarily, a genetic algorithm (GA) suitable for this problem is developed. Lastly, the proposed method for optimizing a pipe arrangement efficiently is demonstrated through computational experiments, and remarks are provided for applying this methodology to a practical pipe arrangement design.

著者

古川 芳孝 貴島 勝郎 茨木 洋 池田 渉 松永 祐樹

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

no.1, pp.151-158, 2005-06

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Navigational safety is highly demanded in order to prevent marine accidents. However the reduction of personnel expenses is enforced recently to reduce total transportation cost and it means that the securement of crew who have an excellent skill becomes difficult. So the increase of sea disaster accident originated with the degradation of skill of sailors is concerned in the future and the introduction of an automatic navigation device is the one of the solution of such a problem. In this paper, the improved algorithm to avoid colliding with a stopping ship is proposed. The effect of parameters on evasion navigation is examined by numerical simulation. Furthermore, model experiments were carried out using Real-time Kinematic GPS (RTK-GPS) at pond to verify the effectiveness of the algorithm for automatic collision avoidance. It is shown that the collision avoidance system functions well both on numerical simulation and model experiments.

著者

斉藤 雅樹 小倉 秀 木本 弘之 山田 吉彦 永水 堅 福士 久人

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

no.2, pp.9-18, 2005-12

被引用文献数

1

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Sugi bark sorbent (SBS), which is recycled waste, is comparable to commonly used petroleum products in performance and cost and has lower environmental loads. It has been commercially produced since 2001. For the purpose of reducing total environmental loads in the oil recovery, we investigated biodegradation disposal of SBS after use (after adsorbing oil), instead of incineration disposal. It was confirmed that the oil content was reduced from 14,300±1,600ppm to 1,500±500ppm after 164 days-period (36m^3 site), and reduced from 8,600±900ppm to 1,400±400ppm after 170 days-period (100m^3 site) in a biodegradation experiment using Bunker C in the bark compost (background : 430±140ppm).

著者

市来崎 哲雄 山本 郁夫

出版者

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.5, pp.9-13, 2007 (Released:2007-09-11)

参考文献数

8

被引用文献数

2

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The authors developed a robotic fish that swim with fins that apply flexible oscillating fin technology. The Carp Robot, whose artificial appearance was created through three-dimensional CAD processing of numerical data for the outer shape of living carp sampled through three-dimensional laser digitizing. Although this robotic fish was developed for the amusement field, it is thought to contain key technologies for the development of work robots in the future. For example, "mechatronics" technology involving center-of-gravity shifts, FM radio wave technology for navigation, CCD image data transfer technology for observation, and other technologies were applied to the robotic fish. In this report this robotic fish will be used as examples to explain these development achievements.