Definition of the Floating System for Phase IV of OC3

Jonkman, Jason

doi:10.2172/979456

Cited by 466 publications

(578 citation statements)

References 5 publications

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“…The structure chosen for the present work is a moored spar, inspired to the OC3-Hywind Spar buoy coupled with the NREL-5MW offshore wind turbine in fully parked conditions [9].…”

Section: Description Of the Numerical Model Of The Structurementioning

confidence: 99%

“…Among floating concepts under study, the spar, consisting of a slender hollow cylinder, placed in vertical position and ballast-stabilized, seems to be particularly appropriate for deep waters (above 100 m). Spar prototypes are involved in projects such as UMaine-Hywind [4], Hywind [7], and OC3-Hywind [8,9]. Insight into the wind-wave response of a spar floating wind turbine has been provided by numerical studies-see e.g., Karimirad and Moan [10].…”

Section: Introductionmentioning

confidence: 99%

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Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method

et al. 2016

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System identification of offshore floating platforms is usually performed by testing small-scale models in wave tanks, where controlled conditions, such as still water for free decay tests, regular and irregular wave loading can be represented. However, this approach may result in constraints on model dimensions, testing time, and costs of the experimental activity. For such reasons, intermediate-scale field modelling of offshore floating structures may become an interesting as well as cost-effective alternative in a near future. Clearly, since the open sea is not a controlled environment, traditional system identification may become challenging and less precise. In this paper, a new approach based on Frequency Domain Decomposition (FDD) method for Operational Modal Analysis is proposed and validated against numerical simulations in ANSYS AQWA v.16.0 on a simple spar-type structure. The results obtained match well with numerical predictions, showing that this new approach, opportunely coupled with more traditional wave tanks techniques, proves to be very promising to perform field-site identification of the model structures.

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“…The structure chosen for the present work is a moored spar, inspired to the OC3-Hywind Spar buoy coupled with the NREL-5MW offshore wind turbine in fully parked conditions [9].…”

Section: Description Of the Numerical Model Of The Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method

et al. 2016

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“…The support structures for the offshore wind turbines are mostly bottom-fixed so far, but there are increasing interest in developing floating wind turbines. Several model tests for floating wind turbines have been performed: model tests on concepts with the NREL 5 MW wind turbine atop three generic floating platforms, i.e., spar, tension leg and semi-submersible (Goupee et al, 2012;Jonkman, 2010) at a 1:50 scaling ratio have been tested in Maritime Research Institute Netherlands (MARIN). Some prototypes have also been tested: Hywind with a 2.3 MW wind turbine was launched in 2009 (Stiesdal, 2009); WindFloat with a 2MW wind turbine was installed in 2011 (Principle Power Website, 2015); and two floating wind turbines were installed in Japan in late 2013, a semi-submersible with 2 MW downwind turbine (Fukushima Offshore Wind Consortium, 2013) and a spar with a 2 MW wind turbine (GOTO FOWT Website, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of hydrodynamic responses of a combined wind and wave energy converter concept in survival modes

Wan

Gao

Moan

2015

Coastal Engineering

114

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The Spar Torus Combination (STC) concept combines a spar floating wind turbine and a torus-shaped heaving-body wave energy converter (WEC). Numerical simulations have shown a positive synergy between the WEC and the spar floating wind turbine under operational conditions. However, it is challenging to maintain structural integrity under extreme wind and wave conditions, especially for the WEC. To ensure the survivability of the STC under extreme conditions, three survival modes have been proposed. To investigate the performance of the STC under extreme conditions, model tests with a scaling factor of 1:50 were carried out in the towing tank of MARINTEK, Norway. Two survival modes were tested. In both modes, the torus WEC was fixed to the spar. In the first mode, the torus WEC is at the mean water surface, while in the second mode, it is fully submerged to a specified position. The measurements in the model tests were the 6 degrees of freedom (D.O.F.s) rigid body motions, mooring line tensions, and the forces between the spar and torus in 3 directions (X, Y and Z). The wind speed was also measured by a sensor in front of the model and the wind force on the wind turbine disk was measured by a load cell installed on top of the tower. This paper describes the model test set-up for the two survival modes, the test results and the numerical model. The results from the entire test matrix of model tests and numerical simulations are presented and compared. The numerical results agree well with the test results for the survival mode with the WEC fully submerged for which the linear hydrodynamic loads dominate. In addition, several nonlinear phenomena were observed during the tests, such as wave slamming, Mathieu instability and vortex induced motion. These nonlinear phenomena were not captured by the present numerical model and the work on a refined hydrodynamic model is still ongoing.

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“…In the present study, the wind turbine corresponds to the NREL 5 MW reference wind turbine [20] with the OC3 Hywind wind tower [21]. The tower of the wind turbine starts 10 m above the waterline.…”

Section: Design Characteristics and Dynamic Modelingmentioning

confidence: 99%

Effect of Flap Type Wave Energy Converters on the Response of a Semi-Submersible Wind Turbine in Operational Conditions

Michailides

Luan

Gao

et al. 2014

Volume 9B: Ocean Renewable Energy

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In the present paper the effect of flap type wave energy converters on the response of a floating semi-submersible wind turbine is investigated and reported. Two different layouts with regard to the number of rotating flaps that are utilized are considered and compared with the case of a pure floating semisubmersible wind turbine. Comparisons of response in terms of stability, motions and internal loads are made for selected environmental conditions. The combined operation of the rotating flaps results in an increase of the produced power without affecting significantly selected critical response quantities of the semi-submersible platform.

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Definition of the Floating System for Phase IV of OC3

Cited by 466 publications

References 5 publications

Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method

Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method

Experimental and numerical study of hydrodynamic responses of a combined wind and wave energy converter concept in survival modes

Effect of Flap Type Wave Energy Converters on the Response of a Semi-Submersible Wind Turbine in Operational Conditions

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