Search Results 1-20 of 1092

  • Hydrodynamic performance and appendage considerations of wave-piercing planing craft overlapping waves and porpoising

    KIM Sangwon , OSHIMA Nobuyuki , LEE Sangeui , LEE Gyoungwoo , SEO Kwangcheol

    … At first, motions on low wavelength region show resonance on this condition, and some appendages enhance the motion amplitude larger than original values. … However, momentum generated from stern appendages increases motions in high wavelength region. …

    Journal of Fluid Science and Technology 15(2), JFST0013-JFST0013, 2020

    J-STAGE 

  • Development of Analysis Method of Moored Ship Motion in 3D Fluid Field  [in Japanese]

    相田 康洋 , 平山 克也

    港湾空港技術研究所報告 = Report of the Port and Airport Research Institute 58(1), 3-5,7-40, 2019-08

  • AN EXPERIMENTAL STUDY ON MOTIONS AND MOORING FORCES OF A VESSEL INSIDE HARBOUR DUE TO TSUNAMI BORE  [in Japanese]

    榊原 繁樹 , 砂原 俊之 , 阿部 郁男 , 久保 雅義 , 津金 正典

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 75(2), I_451-456, 2019

  • Study on Deep Tow System:– Part 2 Study on Motion and Motion Control of Full-scale System -  [in Japanese]

    Nakamura Masahiko , Chaen Takuyo

    … The influence of the towing cable's length, towing speed and the launcher's weight on the submersion depth of the towed vehicle, the influence of motions of the mother-ship on motions of the towed vehicle, the influence of the mother-ship's turning radius on the towed vehicle's drop and motion control performances of the towed vehicle are shown.</p> …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 30(0), 151-164, 2019

    J-STAGE 

  • Effects of Wave Direction Difference Projected by a Ship Handling Simulator on Human Standing Postural Motion  [in Japanese]

    DOINE Renon , SETA Hiroaki , HOMMA Akihiko , SAKAMAKI Takanori

    … In our previous study, we found that the passengers' standing postural motions, such as motions of the head and hip, can cause physical fatigue because of energy expenditures were increased by standing postural motions in a small marine craft. … It was also reported that human standing postural motions are affected by visual stimuli. …

    The Journal of Japan Institute of Navigation 141(0), 39-46, 2019

    J-STAGE 

  • AN EXPERIMENTAL STUDY ON MOTIONS AND MOORING FORCES OF A VESSEL INSIDE HARBOUR DUE TO TSUNAMI BORE  [in Japanese]

    SAKAKIBARA Shigeki , SUNAHARA Shunji , ABE Ikuo , KUBO Masayoshi , TSUGANE Masanori

    <p> 東北地方太平洋沖地震に伴いS港で津波高さ9m超の来襲により荷役係留中に被災した9万DWT級大型石炭船をモデルに,段波津波が作用する場合の港内係留船の船体運動及び係留力に関する実験的検討を行った.被災状況を鑑みて段波津波を模型係留船に船尾から作用させたが,船体運動のSurgeでは津波が船尾に到達した直後から急激に前方に移動し,これに伴い船尾係留索は緊張し,船首係留索は急激に緩むこ …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_451-I_456, 2019

    J-STAGE 

  • NEW EVALUATION FOR M00RING PROBLEM FROM COST-BENEFIT EFFECT  [in Japanese]

    SASA Kenji , AOKI Shinichi , FUJITA Tomohiro , CHEN Chen

    <p> 外洋性港湾における係留問題について,本研究ではある外洋性港湾の石炭船パースを対象に過去3年聞にわたる波浪予報,沖待ち,増取り係留の実態を整理分析した.港内外の長周期波を含む波浪特性についてもデータ分析し,港内において港外の長周期波高が約1.6倍に増幅すること,類似した波浪条件にもかかわらず長周期波高の発生パターンが異なり,予報を困難にしていることがわかった.このため係留システム …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1243-I_1248, 2019

    J-STAGE 

  • A Strip Method Including n<sub>x</sub>-Related Terms and Its Effects on Propeller Inflow Velocity in Waves

    Kitagawa Yasushi , Kashiwagi Masashi

    … Thus the assessment of load fluctuation in ship's main engine in waves is important, for which improvement in ship motion prediction, especially for surge motion, may be a key in enhancement of the prediction of load fluctuation in waves of ship's main engine. …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 29(0), 39-50, 2019

    J-STAGE 

  • Experimental Study on Added Resistance of Very Large Blunt Ship Running in Beam Seas  [in Japanese]

    Yoshida Hisafumi , Orihara Hideo , Takagishi Kenji

    … Therefore, it seems necessary to investigate the influence of ship motion of 6 degrees of freedom on the added resistance in waves again.</p><p>In this paper, measurement of ship motions and added resistance for large blunt ship in oblique and beam waves were carried out and experimentally showed that rolling motion has a very large influence on the resistance increase in waves in the vicinity of its natural period. …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 29(0), 51-56, 2019

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  • Effect of Analytical Method on Hydrodynamic Forces in Numerical Simulation on Ship Motions Moored during Regular Waves in Shallow Water  [in Japanese]

    SAKAKIBARA Shigeki , SUNAHARA Shunji , ITO Kaku , KUBO Masayoshi

    … <p>Many studies on ship mooring problem in ports and harbors during swell and long-period waves have been carried out from 1950s, and a guideline for the problem has been issued as a manual in Japan. … However the ship mooring accidents and interruptions of cargo handling due to the large ship motions have been occurred and remained at terminals located at an exposed area to the ocean. …

    The Journal of Japan Institute of Navigation 140(0), 27-40, 2019

    J-STAGE 

  • Marine Propulsion System Based on Weis-Fogh Mechanism - Propulsive Characteristics of Model Ship with Wing that Produces Rotary Reciprocating Motions  [in Japanese]

    Sakamoto Masahiko , Tsutahara Michihisa

    … <p>The authors have investigated the propulsive characteristics of a model ship with a wing that produces rotary reciprocating motions as a two-dimensional Weis-Fogh model. … The authors compared the results of the investigation with those obtained using a wing that produces linear reciprocating motions. … In a sailing test, the thrust of the model ship, the wing driving forces, and the wing opening angles while the wings were in motion were measured. …

    Marine Engineering 54(1), 88-96, 2019

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  • RANS investigation of influence of wave steepness on ship motions and added resistance in regular waves

    Chen Si , Hino Takanori , Ma Ning , Gu Xiechong

    … The motions and added resistance of the S175 containership in regular head waves with different wave steepness under the same wavelength are investigated using a Reynolds-averaged Navier–Stokes solver based on a finite-volume method. … A level set method is used to capture the free surface and dynamic grids are adopted to simulate ship motions. … The variation of heave and pitch motions and added resistance with the wave steepness agrees with the experiment. …

    Journal of Marine Science and Technology 23(4), 991-1003, 2018-12

    IR 

  • Experimental Study on Nonlinear Effects in Wave-induced Ship Motions and Hydrodynamic Forces  [in Japanese]

    田口 正和 , 柏木 正

    日本船舶海洋工学会講演会論文集 Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers (27), 233-236, 2018-11

  • Coupling of Sloshing and Ship Motions under Wave Action

    JIANG Sheng-chao , SUN Lei

    日本船舶海洋工学会講演会論文集 Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers (26), 5-9, 2018-05

  • ACTIVE VIBRATION COMPENSATION FOR CATWALK BY HYDRAULIC PARALLEL MECHANISM  [in Japanese]

    丹羽 渉

    … However, the traffic ship is fluctuated in tidal waves, and workers on the ship face a risk of accidents such as falling in the sea and being pinched between the traffic ship and the floating structure. … In trial results using a prototype of a scale model, 66% to 84% reduction of the heave, roll and pitch motions of the main hull have been experimentally verified. …

    法政大学大学院紀要. デザイン工学研究科編 = 法政大学大学院紀要. デザイン工学研究科編 (7), 1-6, 2018-03-24

    IR  DOI 

  • A MODELING OF MOORED SHIP MOTIONS ON MULTI-DIRECTIONAL IRREGULAR WAVES BASED ON CADMAS-SURF/3D  [in Japanese]

    相田 康洋 , 平山 克也

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 74(2), I_13-18, 2018

  • Preliminary Study on Characteristics of Motions of Side-by-side Moored Vessels during Waves in Port  [in Japanese]

    SAKAKIBARA Shigeki , SUNAHARA Shunji , ITO Kaku , KUBO Masayoshi

    … The motions and mooring loads of a ship moored along jetty and side-by-side moored two ships are influenced by wave conditions such as wave height, period and its direction, and shallow water effect. …

    The Journal of Japan Institute of Navigation 139(0), 33-47, 2018

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  • Encounter Features of Collision Risk in the West Side Sea Area of Izu Oshima using OZT  [in Japanese]

    NISHIZAKI Chihiro , KAYANO Jun , SHOJI Ruri , IMAZU Hayama

    … <p>It is possible to analyze ship behaviors including encounter frequency of other ship using AIS data.</p><p>Additionally, because of navigator's aging and decreasing, it is necessary to support ship navigation including collision avoidance. … However, the indexes of collision risk proposed in the past are based on relative motions and it is difficult to search safety route easily. …

    The Journal of Japan Institute of Navigation 139(0), 48-54, 2018

    J-STAGE 

  • A MODELING OF MOORED SHIP MOTIONS ON MULTI-DIRECTIONAL IRREGULAR WAVES BASED ON CADMAS-SURF/3D  [in Japanese]

    AIDA Yashiro , HIRAYAMA Katsuya

    外洋に面した離島港湾の岸壁では,沖波が浅海変形・非線形化しながら直接作用するため,係留船舶の動揺量・係留力の算定に際してはこれらを考慮する必要がある.そこで本研究では,CADMAS-SURF/3Dの機能を拡張する形で,変形後の多方向不規則波の造波と任意形状の係留船舶の動揺解析を実現するとともに,NOWT-PARIとのカップリング計算の実施により計算領域を大幅に縮小して計算時間・容量の削減を図る,三 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_13-I_18, 2018

    J-STAGE 

  • Sloshing in vertical and horizontal axisymmetric tanks  [in Japanese]

    Arai Makoto , Hata Reina , Cheng Liang-Yee

    … Almost two-dimensional free surface motion in the tank, i.e., sloshing, and three-dimensional rotating motion of the free surface, i.e., swirling, were typical free surface motions observed. … In the capsule-shaped tanks, we observed multiple swirling, i.e., two or more rotating motions of free surface are generated inside the tanks, when they are excited in their transverse direction. …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 27(0), 117-123, 2018

    J-STAGE 

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