New perspectives in offshore wind energy

Failla, Giuseppe; Arena, Felice

doi:10.1098/rsta.2014.0228

Cited by 33 publications

(25 citation statements)

References 56 publications

(102 reference statements)

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“…In fact, a universal form, S( f ) ∝ β f n , is proposed which makes a fitting process necessary to yield the most appropriate shaping parameters β and n based on analyzing observed wave spectra [18]. One conclusion drawn from the fitting process is that the power index n appears to vary with the water depth and the length of the wind fetch, rather than a universal constant suggested by Equations (1) and (2). Hence, the JONSWASP spectrum model becomes:…”

Section: Wave Spectrum Engineering Modelmentioning

confidence: 99%

“…While the construction and maintenance of a wind farm at an inland site has already reached a mature stage, the techniques required for harvesting offshore wind energy are still a topic for academic research. To harvest wind energy over deep waters (>50 m), a floating foundation which could support an ordinary, commercialized wind turbine is an appealing choice [2,3]. In terms of exploiting offshore wind energy through floating wind farms, the South China Sea has been recognized as an ideal region [4].…”

Section: Introductionmentioning

confidence: 99%

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Wind Profiles and Wave Spectra for Potential Wind Farms in South China Sea. Part II: Wave Spectrum Model

Liu

Qian

et al. 2017

Energies

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Abstract:Along with the commercialization of offshore wind energy in China, the South China Sea has been identified as ideal for constructing offshore wind farms, especially for farms consisting of floating wind turbines over deep waters. Since the wind profiles and wave spectra are somewhat primitive for the design of an offshore wind turbine, engineering models describing the wind and wave characteristics in the South China Sea area are necessary for the offshore wind energy exploitation given the meteorological, hydrological, and geographical differences between the South China Sea and the North/Norwegian Sea, where the commonly used wind profile and wave spectrum models were designated. In the present study; a series of numerical simulations were conducted to reveal the wave characteristics in the South China Sea under both typhoon and non-typhoon conditions. By analyzing the simulation results; the applicability of the Joint North Sea Wave Project (JONSWAP) spectrum model; in terms of characterizing the wind-induced wave fields in the South China Sea; was discussed. In detail; the key parameters of the JONSWAP spectrum model; such as the Phillips constant; spectral width parameter; peak-enhancement factor, and high frequency tail decay; were investigated in the context of finding suitable values.

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Section: Wave Spectrum Engineering Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wind Profiles and Wave Spectra for Potential Wind Farms in South China Sea. Part II: Wave Spectrum Model

Liu

Qian

et al. 2017

Energies

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“…Theoretical and experimental studies have recently demonstrated technical feasibility and economic benefits of floating concepts in waters deeper than 50-60 m, where standard fixed supports are not feasible or too expensive [1][2][3][4][5][6]. 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).…”

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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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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“…After sometime, fatigue loads can cause tiny cracks on the structures due to inability to withstand excessive load. The loads acting on the blades are regarded as aerodynamic load, gravitation load, load due to inertia and mechanical control load [12,13,[15][16][17][18]. Mechanical control loads can be controlled by the same techniques used for aerodynamic and gravitation loads since they have little impact on fatigue damage [12,17].…”

Section: Fatigue Loadmentioning

confidence: 99%

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

Muiruri¹,

Motsamai²

2017

JESTR

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The paper presents overview of source loads and aerodynamic techniques that are feasible for fatigue load reduction on large horizontal axis wind turbines. The article highlights the effects of increasing wind turbine rotor diameter on fatigue load, and feasible aerodynamic techniques that can be employed to reduce fatigue load. Increased in fatigue load is critical as current and future horizontal wind turbines are designed of large rotor blades. Increase in size of wind turbines has been elicited by highly demand for clean energy nowadays as well as need to decrease the cost of energy per kilo watt. As the rotor diameter increases in size, so do effects of air loads acting on the blades. The pitch control systems installed with a purpose of controlling such effects are approaching their capability limits. They are unable to dump sudden, high varying air loads associated with fluctuating wind speed on time. As these effects occur repeatedly during operation of wind turbines, they can cause premature failure or permanent damage of major components due to fatigue load accumulation. In overall, the service life of wind turbine can drastically reduce or high operational and maintenance costs are likely to rise up due to frequent downfalls of unplanned maintenance schedules. Therefore, alternative methods rather than pitch control are reviewed that can improve wind turbines efficiency. The paper concludes by analyzing possible opportunities in future.

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New perspectives in offshore wind energy

Cited by 33 publications

References 56 publications

Wind Profiles and Wave Spectra for Potential Wind Farms in South China Sea. Part II: Wave Spectrum Model

Wind Profiles and Wave Spectra for Potential Wind Farms in South China Sea. Part II: Wave Spectrum Model

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

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

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