Joint Environmental Data at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices

Li, Lin; Gao, Zhen; Moan, Torgeir

doi:10.1115/omae2013-10156

Cited by 65 publications

(49 citation statements)

References 4 publications

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“…In a study under the combined wind and wave power unit project, Marina Platform, joint wind and wave distributions for five sites in European waters were established [21], based on hindcast data of 1-hour averaged sea states and wind. The WindFloat prototype is located in the Atlantic Sea, off the coast of Portugal.…”

Section: Joint Wind and Wave Distributionmentioning

confidence: 99%

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Time domain analysis procedures for fatigue assessment of a semi-submersible wind turbine

Kvittem

Moan

2015

Marine Structures

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Long term time domain analysis of the nominal stress for fatigue assessment of the tower and platform members of a three-column semisubmersible was performed by fully coupled time domain analyses in SimoRiflex-AeroDyn. By combining the nominal stress ranges with stress concentration factors, hot spot stresses for fatigue damage calculation can be obtained. The aim of the study was to investigate the necessary simulation duration, number of random realisations and bin sizes for the discretisation of the joint wind and wave distribution. A total of 2316 3-hour time domain simulations, were performed.In mild sea states with wind speeds between 7 and 9 m/s, the tower and pontoon experienced high fatigue damage due to resonance in the first bending frequency of the tower from the tower wake blade passing frequency (3P).Important fatigue effects seemed to be captured by 1 hour simulations, and the sensitivity to number of random realisations was low when running simulations of more than one hour. Fatigue damage for the tower base converged faster with simulation duration and number of random realisations than it did for the platform members.Bin sizes of 2 m/s for wind, 1 s for wave periods and 1 m for wave heights seemed to give acceptable estimates of total fatigue damage. It is, however, important that wind speeds that give coinciding 3P and tower resonance are included and that wave periods that give the largest pitch motion are included in the analysis.

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Section: Joint Wind and Wave Distributionmentioning

confidence: 99%

“…In order to give an impression of how much the long term fatigue damage can be reduced by applying environmental data from other sites, sensitivity was performed by using the probability distributions from the other sites addressed in [21]. The relative total 20-year fatigue damage (Eq.…”

Section: Total Fatigue Damage For Other Sitesmentioning

confidence: 99%

Time domain analysis procedures for fatigue assessment of a semi-submersible wind turbine

Kvittem

Moan

2015

Marine Structures

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“…14 of the MARINA platform project was selected [23]. Site 14 is in the northern North Sea, off the Norwegian coast and has water depth of 200 m. All the examined ECi, i= 1 ~ 6, represent a range of possible expected operational conditions for given hub-height mean wind speed, Uw.…”

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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“…For a large number of sea states identified in an associated study [26] for a site in the North Sea [27] (with a water depth of 200 m), a series of design load cases (DLCs) as defined in IEC 61400-3 [28] is considered to evaluate the integrated system's motions and loads. Wind turbine Class I with Turbulence Category A per IEC definitions is considered.…”

Section: Selected Design Load Cases Analysismentioning

confidence: 99%

Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

Liu

Thomas

Manuel

et al. 2018

JMSE

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Abstract:Over the past few decades, wind energy has emerged as an alternative to conventional power generation that is economical, environmentally friendly and, importantly, renewable. Specifically, offshore wind energy is being considered by a number of countries to harness the stronger and more consistent wind resource compared to that over land. To meet the projected "20% energy from wind by 2030" scenario that was announced in 2006, 54 GW of added wind energy capacity need to come from offshore according to a National Renewable Energy Laboratory (NREL) study. In this study, we discuss the development of a semi-submersible floating offshore platform with a catenary mooring system to support a very large 13.2-MW wind turbine with 100-m blades. An iterative design process is applied to baseline models with Froude scaling in order to achieve preliminary static stability. Structural dynamic analyses are performed to investigate the performance of the new model using a finite element method approach for the tower and a boundary integral equation (panel) method for the platform. The steady-state response of the system under uniform wind and regular waves is first studied to evaluate the performance of the integrated system. Response amplitude operators (RAOs) are computed in the time domain using white-noise wave excitation; this serves to highlight nonlinear, as well as dynamic characteristics of the system. Finally, selected design load cases (DLCs) and the stochastic dynamic response of the system are studied to assess the global performance for sea states defined by wind fields with turbulence and long-crested irregular waves.

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Joint Environmental Data at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices

Abstract: ABSTRACT

Cited by 65 publications

References 4 publications

Time domain analysis procedures for fatigue assessment of a semi-submersible wind turbine

Time domain analysis procedures for fatigue assessment of a semi-submersible wind turbine

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

Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

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