• 제목/요약/키워드: Floating Architecture

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Stability Evaluation during Transportation of Caisson for Breakwater (방파제용 대형 케이슨 운반에 따른 안정성 평가)

  • Seok, Jun;Park, Jong-Chun;Heo, Jae-Kyung;Kang, Heon-Yong;Bae, Yoon-Hyeok;Kim, Moo-Hyun;Kang, Yoon-Koo
    • Journal of Ocean Engineering and Technology
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    • v.24 no.4
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    • pp.13-22
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    • 2010
  • While a caisson used for breakwater is carried by a floating dock, accompanying stability problem by its existing motions in the dock is quite important and should be pre-checked against sea environmental condition. In the stability analysis, the acceleration, velocity, angle of roll and pitch motions are important to calculate frictional force and separation force. If separation force becomes bigger than frictional force, serious collision may be occurred between caisson and floating dock. In this study, stability evaluation during the transportation of a caisson on floating dock for breakwater was performed by using a commercial program, HydroD and CHARM3D/HARP.

Performance Characteristics of Interference-Type Floating Breakwaters with Various two-dimensional Sectional Shapes (간섭식 부방파제의 2차원 단면형상 소파성능)

  • Song, Mu-Seok;Kim, Do-Young
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.8 no.2
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    • pp.67-73
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    • 2005
  • The characteristics of the floating breakwater is briefly reviewed and their performance is numerically investigated. The numerical scheme is a boundary integral method for inviscid potential flows, and various two-dimensional floating breakwater modules are studied focusing on the transmission coefficient. The general characteristics of pontoons is studied as function of mooring line stiffness, mass moment inertia and draft. Trapezoidal-, hat- and table-shape cross-sections are also studied with varying shape-parameters. The efficiency varies with changes in each shape-parameter and for some cases satisfying tranquility can be expected with even longer waves.

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Analysis method of the Superstructure on Floating Pontoon Considering the Construction Sequences (시공단계를 고려한 플로팅 폰툰의 상부구조물 해석기법)

  • Lee, Young-Wook;Chae, Ji-Yong
    • Journal of Navigation and Port Research
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    • v.36 no.3
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    • pp.225-232
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    • 2012
  • In this research, the influence of additional vertical deformation of floating pontoon when dead load of each story is loaded during construction was investigated. The analysis procedure is presented for considering the influence of the additional deformation to calculate the additional moment of super-frame. Following the procedure, an example building with 3 storied steel frame was analyzed. Analysis method that taking no account for deformation of pontoon to the modeling was underestimated by ignoring design load following deformation of vertical load. By operating the load at the same time, design load under the influence of large deflection of model which whole modeling of floating structure was overestimated. So analysis method of floating structure considering the construction sequences demonstrated the suitable method.

Experimental study on motions of VLCO for wave power generation (2. Multiple floating bodies) (파력발전용 가변수주진동장치의 운동에 대한 실험적 연구 (2. 다수 부유체))

  • Lee, Seung-Chul;Goo, Ja-Sam
    • Journal of Ocean Engineering and Technology
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    • v.27 no.6
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    • pp.27-31
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    • 2013
  • The structure of a variable liquid column oscillator(VLCO) is analogous to that of the tuned liquid column damper used to suppress oscillatory motion in large structures like tall buildings and cargo ships. The VLCO is a system for absorbing the high kinetic energy of the accelerated motions of multiple floating bodies using an air-spring effect produced the installation of inner air chambers. Thus, a VLCO can improve the energy efficiency of the activating object type of wave energy converters made by the Pelamis Company. In this research, an experiment was performed in two cases: with the top valves closed and open. The floating bodies were connected by hinges. The effect of the internal flow was estimated by comparing the results for the closed and open valves.

Development of the Winch System Model for HILS of the Winch Control System (해상크레인용 윈치 제어시스템 HILS 구축을 위한 윈치 시스템 모델 개발)

  • Lim, Chae-Og;Shin, Sung-Chul
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.6_2
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    • pp.937-946
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    • 2021
  • The floating crane is used to lift the heavyweight on the ocean. The floating crane has a winch system for lifting the heavyweight and the system is controlled by the winch control system. The heavyweight is lifted safely by control of the winch control system. Before the make the control system and controller, there are many restricted conditions to test and validate at design and development steps. In order to solve the problems, commonly use the HILS (Hardware-In-the-Loop-Simulation). HILS is the method of test and validation for the hardware control system. It can be composed of the control system in hardware with surrounding environments which is a virtual model. In this study, we developed the winch system model for HILS of the 150t winch control system in a floating crane. Through this simulation and winch model, it can be applied to HILS for the winch control system.

Numerical investigation of floating breakwater movement using SPH method

  • Najafi-Jilani, A.;Rezaie-Mazyak, A.
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.3 no.2
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    • pp.122-125
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    • 2011
  • In this work, the movement pattern of a floating breakwater is numerically analyzed using Smoothed Particle Hydrodynamic (SPH) method as a Lagrangian scheme. At the seaside, the regular incident waves with varying height and period were considered as the dynamic free surface boundary conditions. The smooth and impermeable beach slope was defined as the bottom boundary condition. The effects of various boundary conditions such as incident wave characteristics, beach slope, and water depth on the movement of the floating body were studied. The numerical results are in good agreement with the available experimental data in the literature The results of the movement of the floating body were used to determine the transmitted wave height at the corresponding boundary conditions.

Energy Consumption Estimation for Equitment Typical Floating Building with ECO2 Program (ECO2 프로그램을 이용한 설비 대안별 플로팅 건축물 에너지 사용량 예측)

  • Jang, Mun-Ki;Hwang, Dong-Kon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.10a
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    • pp.203-204
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    • 2014
  • In addition, a floating building is emerging as a new type of building. Therefore, this study evaluates energy consumption of floating building by design alternatives and will provide basic data for zero-energybuilding of floating architecture.

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Research of Combined Containment System for Floating LNG (플로팅 엘엔지 복합 화물창 시스템 연구)

  • Kim, Soo-Young;Kim, Sung-Chul;Lee, Dong-Hyun
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.3
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    • pp.342-347
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    • 2015
  • Floating LNG is a new concept which is used as LNG regasification/receiving facility and for LNG production/export facility. LNG Floating Production Storage and Offloading(FPSO) concept will put vitality into marginal gas fields which were delayed because of excessive investment cost in the world. LNG Floating Storage Regasification Unit(FSRU) also provides commercially competitive and effective solutions to the areas where onshore infrastructure is not well established. LNG cargo containment system is one of the key functions for FLNG to store produced LNG on a floating structure. This paper presents a new technology related to a LNG containment system; a combined cargo containment system utilizing the advantages of iIndependent tank type and membrane system. Technical advantages have been validated through research work.

Design of a high-performance floating-point unit adopting a new divide/square root implementation (새로운 제산/제곱근기를 내장한 고성능 부동 소수점 유닛의 설계)

  • Lee, Tae-Young;Lee, Sung-Youn;Hong, In-Pyo;Lee, Yong-Surk
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.37 no.12
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    • pp.79-90
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    • 2000
  • In this paper, a high-performance floating point unit, which is suitable for high-performance superscalar microprocessors and supports IEEE 754 standard, is designed. Floating-point arithmetic unit (AU) supports all denormalized number processing through hardware, while eliminating the additional delay time due to the denormalized number processing by proposing the proposed gradual underflow prediction (GUP) scheme. Contrary to the existing fixed-radix implementations, floating-point divide/square root unit adopts a new architecture which determines variable length quotient bits per cycle. The new architecture is superior to the SRT implementations in terms of performance and design complexity. Moreover, sophisticated exception prediction scheme enables precise exception to be implemented with ease on various superscalar microprocessors, and removes the stall cycles in division. Designed floating-point AU and divide/square root unit are integrated with and instruction decoder, register file, memory model and multiplier to form a floating-point unit, and its function and performance is verified.

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Numerical study on the resonance response of spar-type floating platform in 2-D surface wave

  • Choi, Eung-Young;Cho, Jin-Rae;Jeong, Weui-Bong
    • Structural Engineering and Mechanics
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    • v.63 no.1
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    • pp.37-46
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    • 2017
  • This paper is concerned with the numerical study on the resonance response of a rigid spar-type floating platform in coupled heave and pitch motion. Spar-type floating platforms, widely used for supporting the offshore structures, offer an economic advantage but those exhibit the dynamically high sensitivity to external excitations due to their shape at the same time. Hence, the investigation of their dynamic responses, particularly at resonance, is prerequisite for the design of spar-type floating platforms which secure the dynamic stability. Spar-type floating platform in 2-D surface wave is assumed to be a rigid body having 2-DOFs, and its coupled dynamic equations are analytically derived using the geometric and kinematic relations. The motion-variance of the metacentric height and the moment of inertia of floating platform are taken into consideration, and the hydrodynamic interaction between the wave and platform motions is reflected into the hydrodynamic force and moment and the frequency-dependent added masses. The coupled nonlinear equations governing the heave and pitch motions are solved by the RK4 method, and the frequency responses are obtained by the digital Fourier transform. Through the numerical experiments to the wave frequency, the resonance responses and the coupling in resonance between heave and pitch motions are investigated in time and frequency domains.