Presented herein is a literature review on the design and performance of antimotion structures/devices such as breakwaters, submerged plates, oscillating water column air-cushion, auxiliary attachments, mechanical joints for mitigating hydroelastic response very large floating structures (VLFS) under wave action. Shapes VLFS that could minimize hydrodynamic structure are also discussed. The analytical, numerical, experimental methods used in studying effect these toward reducing responses reviewed.

This article presents a literature survey of research and development on floating wind turbines. The various, proposed conceptual designs for platforms used turbines are described the working principles these various floater concepts outlined. is followed by an overview work that has been undertaken pertaining to turbine technology several institutes academic community. date reviewed categorically according concept (spar-buoy type, TLP semi-submersible pontoon type others) as per sections...

Cold-water pipe (CWP) is a novel, most-challenging component of Ocean Thermal Energy Conversion (OTEC) floating structure which installed to transport the deep seawater board. For commercial scale, transported flow rate will be in order 102 m3/s. This large amount internal may trigger instability leads failure CWP. Considering this issue, present paper aims design commercial-scale OTEC CWP focusing on effects stability pipe. The analysis deliberated select material, top joint configuration...

Ocean thermal energy conversion (OTEC) is a process of generating electricity by exploiting the temperature difference between warm surface seawater and cold deep seawater. Due to high static dynamic pressures that are caused circulation, stiffened panel constitutes tank may undergo reduction in ultimate strength. The current paper investigates design stiffening systems for OTEC tanks examining effects parameters such as stiffener sizes span-over-bay ratio applied combined loadings lateral...

Abstract Accurate estimation of the dynamic response Floating Offshore Wind Turbines (FOWTs) are essential for design and development FOWTs to ensure their safety reliability. Up now, extensive efforts tools have been made, nowadays several available. The simulation validated using water tank experimental data comparisons between codes. Although validation full-scale FOWT has performed, there few published literatures publicly In this paper, we describe a 2-MW spar-type during power...

In this paper, motion of a SPAR-type floating offshore wind turbine (FOWT) subjected to wave loadings is examined. The proposed prototype FOWT mounts 2MW down-wind type, whose rotor diameter 80m and hub-height 55m. foundation measures 60m in draft, having circular sections 12m at the lower part, 8.4m middle (main) part 4.8m upper part. be moored by conventional anchor-chain system. order design such system, it essential predict environmental as irregular waves, turbulent winds, currents,...

This study aims at development of a cost-effective, floating offshore wind turbine. The prototype model considered herein is composed (1) 2-MW horizontal-axis turbine (HAWT) downwind type, (2) steel monotower with 55-m hub height above sea level, (3) steel-prestressed concrete (PC) hybrid SPAR-type foundation 70-m draft, and (4) catenary mooring system using anchor chains. In order to demonstrate the feasibility concept, an at-sea experiment 1/10-scale has been made. demonstrative includes...

Accurate estimation of the dynamic behavior Floating Offshore Wind Turbines (FOWTs) under typhoon environment is essential to design and install FOWTs in a prone area typhoons such as around Japan. Up now, extensive efforts for development tools have been made, nowadays several are available. Needless say, it utmost importance that engineering verified validated real physical phenomena before being applied designs/projects with confidence. Much thus made code-to-code comparisons by...

This paper presents analytical and numerical analyses on self-induced vibration of Ocean Thermal Energy Conversion (OTEC) Cold Water Pipe (CWP) for a 100 MW-net OTEC power plant. The CWP is described as vertically-hanged, top-tensioned riser subjected to internal flow effect (IFE) ambient fluid effects (added mass drag force). In the analysis, two definitions force equation in frequency-domain term time-domain are considered yielding linear differential non-linear equation. stability...

Abstract The history of floating bridges can be dated back to 2000 BC. There are many types bridges, depending on the conditions land and barriers cross. As compared with land‐based only limited information is available for in respects, such as past construction records, meteorological durability conditions. In recent years it has been possible design more scientifically because theoretical developments hydrodynamic interactions between fluid bodies. This paper aims overview analysis...

In this paper, dynamic response analysis of a Floating Offshore Wind Turbine (FOWT) with Spar-type floating foundation is presented. The FOWT mounts 100kW down-wind turbine, and grid-connected. It was launched at sea on 9th June 2012, moored 11th for the purpose demonstration experiment. During experiment, attacked by severe typhoon events twice. Among them, Sanba (international designation: 1216) strongest tropical cyclone worldwide in 2012. central atmospheric pressure 940 hPa when it...

This paper is concerned with the development of a floating offshore wind turbine (FOWT) utilizing spar-type foundation. In order to design such structure, it essential evaluate dynamic response under extreme environmental conditions. this study; therefore, analysis tool has been developed. The consists multibody dynamics solver (MSC.Adams), aerodynamic force evaluation library (NREL/AeroDyn), hydrodynamic (in-house program named SparDyn), and mooring Moorsys). paper, some details developed...

A floating Ocean Thermal Energy Conversion (OTEC) plant requires a large-diameter Cold Water Pipe (CWP) to be attached structure. For the design of mooring system and CWP, coupled analysis body, CWP should employed due huge mass internal fluid in CWP. The aim this paper is construct simplified response model facilitate preliminary stage design. equations equilibrium motion are derived based on modeling as two-dimensional body an elastic pendulum. In order verify applicability for practical...

Dynamic stability due to internal axial flow is a considerable problem for pipe conveying fluid such as deep seawater intaking an Ocean Thermal Energy Conversion (OTEC) plant. However, there has been much ambiguity about its dynamics, and this raises question whether aspirating submerged in water flutters or not. Therefore, the objective of paper provide experiment take new look at dynamics (water). The experimental apparatus constructed eliminate expected disturbances, we measure free...

Abstract Development of offshore wind energy is desired as a countermeasure against global warming. This article presents motion analysis floating turbine during the rotor-rotation under loads. A 2 MW downwind mounted on foundation spar-type. The loads acting rotor blades are calculated using blade element momentum theory. multibody dynamics system theory employed to consider effect rotor-rotation. As result, yaw, sway and roll generated due gyro-moment for Keywords: bodydynamic responsewind...