• Title/Summary/Keyword: 계류

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Motion Response and Mooring Analysis of Mobile Harbors Moored in Side-by-side (병렬 계류된 모바일하버의 운동응답 및 계류 해석)

  • Kim, Young-Bok
    • Journal of Ocean Engineering and Technology
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    • v.23 no.6
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    • pp.53-60
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    • 2009
  • Recently, since there are several problems in space, the infra-structure and the facilities in the contiguity of the existing harbors due to the trend of enlarging the container capacity of the large container vessel, a special floating platform named as the Mobile Harbor has been proposed conceptually as an effective solution of those problems. Two kinds of hull shapes, a conventional mono-hull type and a catamaran type, are proposed as midway feeders to transfer containers to the harbor on land from a large container ship on near shore. In this study, the motion response and mooring analysis are carried out for comparing the global performance of two types of Mobile Harbor. Robot arm mooring facility specially is devised and newly tried to use for the safe fixation of a large container ship and the Mobile Harbor on near shore. It would be expected for this comparison study to give a guideline to design the efficient hull form for a midway loader.

Study on Effective Arrangement of Mooring Lines of Floating-Type Combined Renewable Energy Platform (부유식 복합 재생에너지 플랫폼 계류선의 효과적 배치에 관한 연구)

  • Choung, Joonmo;Jeon, Gi-Young;Kim, Yooil
    • Journal of Ocean Engineering and Technology
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    • v.27 no.4
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    • pp.22-32
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    • 2013
  • This paper presents the conceptual design procedure for the taut-leg mooring lines of a floating-type combined renewable energy platform. The basic configuration of the platform is determined based on an understanding of floating offshore plants. The main dimensions and mass distribution are determined based on a hydrostatic calculation. To identify the motion history of the floating platform and the tension history of the mooring lines, a hydrodynamic analysis is executed using Ansys.Aqwa. This helps in the selection of the best configuration for the mooring system such as the number of mooring lines, wire types, anchored positions, etc. In addition, the fatigue life of the mooring lines can be predicted from the tension history using the rain-flow cycle counting method.

Wave Control Performance of Moored Pontoon-Type Floating Breakwater (계류된 사각형 부유식 방파제의 파랑제어성능)

  • Cho I. H.
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.5 no.3
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    • pp.35-44
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    • 2002
  • In this paper, the analytic studies on the wave control performance of moored pontoon-type floating breakwater are presented. A two-dimensional eigenfunction expansion method is adopted to study the motion responses and the transmission coefficients of pontoon-type floating breakwater in beam waves. The stiffness coefficients of mooring line are idealized as linear elastic spring. Comparison of the analytical results with a numerical results (FEM) shows good agreement over a wide range of frequencies. The performance of mooed pontoon-type floating breakwater is tested with various design parameters such as sectional geometry, mooring line characteristics and wave frequencies. It is found that the properly designed floating breakwater can be an effective wave control structure.

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Extreme Mooring Analysis of Turret Moored LNG-FSRU (터렛 계류된 LNG-FSRU의 극한 계류 해석)

  • Lee, Min-Kyeong;Jung, Kwang-Hyo;Park, Sung-Boo;Yu, Byeong-Seok;Chung, Yun-Suk
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.5
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    • pp.435-446
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    • 2016
  • In this study, hydrodynamic and mooring analysis for LNG FSRU moored by an internal turret with 9 mooring lines are numerically performed using commercial softwares, Hydrostar and Ariane. Met-ocean combinations for screening method are taken from wave governed condition(BV Rule Note NR 493) with relative heading between wave and wind between −45° and +45° and relative heading between wind and current between −30° and +30°. Extreme mooring analysis and sensitivity analysis are performed for intact and damaged (=one line missing) conditions and the parameters for sensitivity analysis are wave peak period, peak enhancement factor and line pretension. In the viewpoint of the design tension in mooring line, chain diameter is designed to satisfy safety factor for each conditions. As the chain diameter is increased from 152mm to 171mm, the designtension is reduced while the minimum breaking load is increased.

A Study on the Motion of a Single Point Moored Ship in Irregular Waves (불규칙파중 1점계류 선바의 거동해석에 관한 연구)

  • Lee, Seung-Keon;Jo, Hyo-Jae;Kang, Dong-Hoon
    • Journal of Navigation and Port Research
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    • v.27 no.1
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    • pp.55-61
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    • 2003
  • The maneuvering equations of motion are derived to express the motion of a ship. The wave forces in the time domain analysis are generated from the frequency transfer function calculated by 3-D source distribution method. The linear wave forces whose periods are equal to those of incident waves and the nonlinear wave forces that make long period drift forces are computed for the simulation. The consideration of irregular waves and nonlinear wave force effects on the slew motion are carried on the analyzing the motion of ship in the regular and irregular waves.

Reliability Based on Robust Design Optimization of Tension Mooring Unit Considered Marine Circumstance Condition (해양 환경조건을 고려한 긴장계류장치의 신뢰성 기반 강건설계 최적화)

  • Oh, Young-Cheol;Kang, Byoung-Mo;Ko, Jae-Yong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.06a
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    • pp.120-121
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    • 2013
  • Recently, our country is to be diversification a leisure activity and tourism form by income level rise and traffic circumstance improvement. But Basic facilities expropriated these leisure activities have built an insufficient condition. Also, Building a facility, Introduced tools and materials import the whole quantity. Therefore, In this paper, it builds a tension mooring unit to use EPDM and Kevlar R29 and it develops a domestic marine circumstance through reliability based on robust design. It contributes to marine leisure culture activation and industry development.

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Behavior of Mooring Line of Silt Protector According to the Change of Sea Level (조위변화에 따른 오탁방지막 계류라인의 거동)

  • 홍남식;김정윤
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.14 no.3
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    • pp.232-239
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    • 2002
  • This paper studies the behavior of mooring line of silt protector according to the change of sea level. It is found from the analysis of the behavior that if the taut cable length has been determined appropriately within the range of safety factor, the tensioned cable has almost constant tension regardless of the water depth. The whole structure, however, becomes unstable due to the loss (zero tension) of the released cable tension. It is also recognized from the investigation for the effect of intial straight line angle on the behavior of mooring line that the design through the conceptually combined consideration of the cable tension, total scope and buoy deflection has to be required in the mooring analysis. Finally, the material of cable is not damaged because the cable tension is reduced by attached shellfish, but the whole structure may be also unstable by the effect on the anchor angle, total scope and buoy deflection.

Prediction on Mooring Tension & Motion Response Characteristics of a Floating Dock in Regular Waves (규칙파 중 플로팅 도크의 운동응답특성 및 계류장력 추정)

  • Oh, Young-Cheol;Gim, Ok-Sok;Ko, Jae-Yong
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.19 no.2
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    • pp.200-206
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    • 2013
  • The paper was investigated on the mooring forces(or tension) and motion response characteristics for a 8-point mooring floating dock in regular waves using a commercial code(AQWA). To achieve the aim of the research, a numerical simulation was adapted on an inner port environment condition, which the water depth is 10 meters, significant wave amplitude(1.05 m). wave period(3.85 sec), wind speed(20.21 m/s), wind and current direction ($90^{\circ}$), incident waves(${\chi}=180^{\circ}$, $135^{\circ}$ and $90^{\circ}$). The dimension of the numerical model is length(140 m), breadth(32 m), depth(14.6 m). The maximum length of a mooring line is 120m. We can expected that roll and pitch motions appeared in beam seas better than head sea. the mooring forces also indicated higher in bean seas than in head seas including wind forces.

Dynamic Analysis of Floating Wave Energy Generation System with Mooring System (계류시스템을 가진 부유식 파력발전기의 동적거동 해석)

  • Choi, Gyu Seok;Sohn, Jeong Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.2
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    • pp.257-263
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    • 2013
  • In this study, dynamic behaviors of a wave energy generation system (WEGS) that converts wave energy into electric energy are analyzed using multibody dynamics techniques. Many studies have focused on reducing the effects of a mooring system on the motion of a WEGS. Several kinematic constraints and force elements are employed in the modeling stage. Three-dimensional wave load equations are used to implement wave loads. The dynamic behaviors of a WEGS are analyzed under several wave conditions by using MSC/ADAMS, and the rotating speed of the generating shaft is investigated for predicting the electricity capacity. The dynamic behaviors of a WEGS with a mooring system are compared with those of a WEGS without a mooring system. Stability evaluation of a WEGS is carried out through simulation under extreme wave load.

The study On An Yacht Moorings Establishment Location Analysis Using Optimum Spiral Method (최적화 기법을 이용한 요트 계류장 입지분석에 관한 연구)

  • Park, Sung-Hyeon;Joo, Ki-See
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.17 no.4
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    • pp.323-329
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    • 2011
  • This study is to determine an optimal yacht mooring location candidate among many alternative candidates in order to obtain the maximized efficiency under the natural conditions using integer programming. To deal with marina's construction location, the optimal construction location is selected using 21 important factors analysis for 4 candidates in the Mokpo city. The development period and the initial investment cost weight are one and half times more than the others among 21 factors. The optimal spiral analysis of weighted linear model shows that the Peace Square sea area is selected as the most optimal place among 4 candidates. This proposed model has not been applied in the optimal marina's facility candidate selection problem yet. This paper will contribute to determine the most reasonable alternative. Also, this proposal model can be applied to other marina's facility candidate selection problem in other regions.