On Sea Experiment of a Hybrid SPAR for Floating Offshore Wind Turbine Using 1/10 Scale Model

Utsunomiya, Tomoaki; Matsukuma, Hidekazu; Minoura, Shintaro; Ko, Kiyohiko; Hamamura, Hideki; Kobayashi, Osamu; Sato, Iku; Nomoto, Yoshihisa; Yasui, Kentaro

doi:10.1115/omae2010-20730

Cited by 23 publications

(11 citation statements)

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“…The detailed specifications will be given later; however, the state-of-the-art specifications are followed. The experimental validation is necessary in order to apply the developed code for structural design of a real structure, Utsunomiya et al, [7][8][9] have, thus, made a series of experiments, and the developed code has been validated against these experimental results. However, these experiments do not cover the cases where wind, wave, and current are applied at the same time and the vertical fins for mitigation of yaw motion (stated later) are equipped.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions

Utsunomiya

Yoshida

Ookubo

et al. 2014

Journal of Offshore Mechanics and Arctic Engineering

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This paper is concerned with the development of a floating offshore wind turbine (FOWT) titilizing spar-type floating foundation. In order to design such a structure, it is essential to evaluate the dynamic response under extreme environmental conditions. In this study; therefore, a dynamic analysis tool has heen developed. The dynamic analysis tool consists of a multibody dynamics solver (MSCAdams), aerodynamic force evaluation library (NRELIAeroDyn), hydrodynamic force evaluation library (in-house program named SparDyn), and mooring force evaluation library (in-house program named Moorsys). In this paper, some details of the developed dynamic analysis tool are given. In order to validate the program, comparison with the experimental results, where the wind, current, and wave are applied simultaneously, has been made. In this paper, only parked conditions are considered. The comparison shows that the principal behavior of the floating offshore wind turbine with spar platform has been captured by the developed program. However, when vortex-induced motion (VIM) occurs, the current loads and cross-flow responses (sway and roll) are underestimated by the simulation since the simulation code does not account for the effect of VIM.

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Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions

Utsunomiya

Yoshida

Ookubo

et al. 2014

Journal of Offshore Mechanics and Arctic Engineering

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“…Due to spar buoy's excellent stability and after continuous theoretical studies and site monitoring, the Hywind concept has eventually been commercialized in the world's first floating wind farm: Hywind Scotland [25], in 2017, which is a milestone in the offshore wind turbine history. Utsunomiya [26][27][28] also proposed a hybrid spar type FOWT. The lower part of the spar platform was made of prestressed concrete composed of precast segments and the upper part was made of steel in order to reduce the platform construction cost.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Response Analysis for a Floating Offshore Wind Turbine Integrated with a Steel Fish Farming Cage

Zheng

Lei

2018

Applied Sciences

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A state-of-the-art concept integrating a deepwater floating offshore wind turbine with a steel fish-farming cage (FOWT-SFFC) is presented in this paper. The configurations of this floating structure are given in detail, showing that the multi-megawatt wind turbine sitting on the cage foundation possesses excellent hydrostatic stability. The motion response amplitude operators (RAOs) calculated by the potential-flow program WAMIT demonstrate that the hydrodynamic performance of FOWT-SFFC is much better than OC3Hywind spar and OC4DeepCwind semisubmersible wind turbines. The aero-hydro-servo-elastic modeling and time-domain simulations are carried out by FAST to investigate the dynamic response of FOWT-SFFC for several environmental conditions. The short-term extreme stochastic response reveals that the dynamic behavior of FOWT-SFFC outperforms its counterparts. From the seakeeping and structural dynamic views, it is a very competitive and promising candidate in offshore industry for both power exploitation and aquaculture in deep waters.

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“…Utsunomiya et al 6 reported experiments of a 1/10 scale model wind turbine on a Spar-type foundation installed 30 m from the quay of Sasebo shipbuilding yard in Japan. The main focus of this study was the dynamics of the substructure, and the applied wind turbine was chosen as a conventional micro wind turbine.…”

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confidence: 99%

Small scale experimental study of the dynamic response of a tension leg platform wind turbine

Hansen¹,

Laugesen²,

Bredmose³

et al. 2014

Journal of Renewable and Sustainable Energy

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A floating Tension Leg Platform (TLP) wind turbine was constructed at scale 1/200 and its dynamic response was analysed experimentally in co-directional wind and waves. The wind turbine was Froude scaled and a new rotor was designed to yield maximum power and Froude scaled thrust at the low model Reynolds number. Physical limitations due to the large scaling ratio further meant that some structural adjustments were necessary. Nacelle and floater accelerations were measured by means of two accelerometers. The TLP was moored with four different tendon configurations and exposed to different constant wind speeds and irregular sea states as well as a range of regular waves. It was found that an increase in wind speed reduces the wave-induced floater motion but causes slightly larger nacelle displacements. Further, the orientation of the spokes relative to the direction of wind and waves influences the pitch stiffness and thereby the nacelle displacements. Inclining the tendons towards the wind turbine reduces the nacelle displacements significantly and reduces the occurrence of slack tendons, but increases the inline tilt-motion of the rotor. Application of a very stiff mooring configuration increases the occurrence of slack tendons and the magnitude of the pitch accelerations. In a robust commercial design, however, slack tendons must be avoided. The experiments demonstrate the ability of the wind turbine model and the experimental setup to give insight to the dynamic characteristics of floating TLP wind turbines. V C 2014 AIP Publishing LLC. [http://dx.

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On Sea Experiment of a Hybrid SPAR for Floating Offshore Wind Turbine Using 1/10 Scale Model

Cited by 23 publications

References 0 publications

Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions

Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions

Stochastic Response Analysis for a Floating Offshore Wind Turbine Integrated with a Steel Fish Farming Cage

Small scale experimental study of the dynamic response of a tension leg platform wind turbine

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