Browsing by Subject "Wind Energy and Wind Turbines"
Now showing items 1-20 of 30
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A Comparison of Soil Structure Interaction Models for Dynamic Analysis of Offshore Wind Turbines
(2020)This paper compares the dynamic response of an OWT structure where the below ground pile-soil behaviour is modelled using (i) the conventional API ‘p-y’ approach and (ii) the ‘PISA’ approach. A nonlinear aero-elastic code ... -
Corrosion fatigue analysis of NREL's 15-MW offshore wind turbine with time-varying stress concentration factors
(2024)Over the last twenty years, significant development in wind turbine technologies has led to a dramatic increase in the scale of wind turbines with many now beginning to be installed in offshore locations. Consequently, ... -
Enhancing the reliability of floating offshore wind turbine towers subjected to misaligned wind-wave loading using tuned mass damper inerters (TMDIs)
(2023)Floating offshore wind turbines (FOWTs) are the largest rotating structures on the earth. Dynamically sensitive structures such as these must be protected in these environments to ensure that they can continue to operate ... -
Estimating the performance of wind turbines misaligned with respect to the wind direction using a simplified CFD based approach
(2024)Wind direction in atmospheric boundary layer changes constantly. As such, the power extracted from the wind turbines in a wind farm is subjected to change. This change in wind direction impacts the wake pattern which in ... -
Flow in a large wind field with multiple actuators in the presence of constant vorticity
(2022)Study of wind farms is an area of active research. Researchers have proposed simplified wind farm models which define the wake structure in a wind farm and how they affect the performance of the wind turbines. Interestingly ... -
Fluid inerter for optimal vibration control of floating offshore wind turbine towers
(2022)This paper proposes the use of a tuned mass damper fluid-inerter (TMDFI) for vibration control of spar-type floating offshore wind turbine towers. The use of an inerter in parallel with the spring and damper of a tuned ... -
Impact of Sources of Damping On the Fragility Estimates of Wind Turbine Towers
(2024)Fragility estimates in wind turbine towers have been investigated but the the effect of damping on fragility has not been studied. While damping can often be small, it can come from different sources for a wind turbine. ... -
Improved fatigue life of floating offshore wind turbine towers with tuned mass damper inerters (TMDIs)
(2023)Floating offshore wind turbines (FOWTs) are the largest rotating structures on earth. FOWTs are very flexible and dynamically sensitive, they are also installed in very harsh environments and exposed to stochastic ... -
Individual Blade Pitch Control of Floating Offshore Wind Turbines for Load Mitigation and Power Regulation
(2020)This paper proposes a new strategy for individual blade pitch control to regulate power production while simultaneously alleviating structural loads on spar-type floating offshore wind turbines. Individual blade pitch ... -
Interpolation of confidence intervals for fatigue design using a surrogate model
(2018)For complex systems, the applicability of surrogate models has shown the potential to enable accurate assessments using a reduced batch of data and to compile information about large datasets. These behave as black-box ... -
Multi-resolution wavelet pitch controller for spar-type floating offshore wind turbines including wave-current interactions
(2020)This paper proposes a wavelet multi-resolution based individual pitch control strategy for spar-type floating offshore wind turbines (FOWTs) and investigates its performance under joint wind-wave-current loads considering ... -
Nonlinear model predictive control to reduce pitch actuation of floating offshore wind turbines
(2020)Modern-day wind turbines use active pitch control to reduce mechanical loads on the turbines in addition to regulating generator power. These control algorithms increase blade pitch actuation, primarily to reduce the 1P ... -
On the calculation of offshore wind turbine load spectra for fatigue design
(2018)The present work researches on the definition of the load spectra used for offshore wind turbine low SN slope materials’ fatigue design. Uncertainty in the sample sized used to scale fatigue life is analyzed for the tower ...