Browsing School of Engineering by Author "Fitzgerald, Breiffni"
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Active strategies with TMDs for control of wind turbine vibrations
Fitzgerald, Breiffni (Trinity College (Dublin, Ireland). Department of Civil, Structural and Environmental Engineering, 2012)This thesis investigates the use of active structural control techniques for the mitigation of the dynamic response of wind turbines with particular emphasis on reducing the in-plane (edgewise) vibrations in wind turbine ... -
An Assessment of the Potential for Co-located Offshore Wind and Wave Farms in Ireland
Fitzgerald, Breiffni (2020)Ireland’s geographic location along the Atlantic Ocean means that it has one of the highest resources of wind and wave energy on the planet. Despite this, successful integration of wave energy into the Irish energy system ... -
A Comparison of Soil Structure Interaction Models for Dynamic Analysis of Offshore Wind Turbines
Fitzgerald, Breiffni; Igoe, David (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
Fitzgerald, Breiffni; Broderick, Brian (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, ... -
Damping Ratio Estimation for a Slender Modular Building from Full Scale Ambient Response Monitoring
Fitzgerald, Breiffni; Broderick, Brian; Hickey, John (2023)The application of modular construction in tall slender structures is a relatively novel concept. Modular buildings with heights exceeding 130m have been successfully constructed by combining reinforced concrete cores with ... -
The Effect of Acceleration Signal Length on the Outputs from Modal Identification Methods
Fitzgerald, Breiffni; Broderick, Brian; Hickey, John (2023)The damping ratio is a significant factor influencing the dynamic behaviour of a structure. The safety, serviceability and habitability of a structure are all impacted by the damping ratio. Damping ratio does not relate ... -
Enhancing the reliability of floating offshore wind turbine towers subjected to misaligned wind-wave loading using tuned mass damper inerters (TMDIs)
Fitzgerald, Breiffni (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
Fitzgerald, Breiffni; Basu, Biswajit; Basu, Sudipta Lal (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 ... -
Experimental and computational evaluation of modal identification techniques for structural damping estimation
Fitzgerald, Breiffni; Broderick, Brian (2022)The damping ratio is a key indicator of a structures susceptability to human discomfort due to dynamic loads. Computational models, wind tunnel studies and empirical data can provide estimates of the damping ratio of a ... -
Flow in a large wind field with multiple actuators in the presence of constant vorticity
Fitzgerald, Breiffni; Basu, Biswajit; Soodhalter, Kirk (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
Fitzgerald, Breiffni (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 ... -
Fragility analysis of the IEA-15MW wind turbine blades using the surrogate modelling approach
ICASP14; Baisthakur, Shubham; McAuliffe, James; Fitzgerald, Breiffni (2023)With the concerns related to global warming and the political scenario threatening energy security, all the nations are moving toward renewable energy sources. Wind energy has seen tremendous scale and power generation ... -
Impact of Sources of Damping On the Fragility Estimates of Wind Turbine Towers
Fitzgerald, Breiffni (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)
Fitzgerald, Breiffni; Broderick, Brian (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
Fitzgerald, Breiffni; Basu, Biswajit; Sarkar, Saptarshi (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 ... -
Mitigation of wind induced accelerations in tall modular buildings
Hickey, John; Broderick, Brian; Fitzgerald, Breiffni (2022)This paper compares two methods of mitigating wind induced vibrations in tall modular buildings. Tall buildings experience wind induced motion which can result in serviceability and habitability issues associated with ... -
Mitigation of Wind Induced Accelerations in Tall Modular Buildings
Fitzgerald, Breiffni; Broderick, Brian (2022)This paper compares two methods of mitigating wind induced vibrations in tall modular buildings. Tall buildings experience wind induced motion which can result in serviceability and habitability issues associated with ... -
Model Validation for the Wind Response of Modular High-Rise Buildings through Full Scale Monitoring
Fitzgerald, Breiffni; Broderick, Brian (2022)For many tall building forms, habitability requirements associated with excessive acceleration response become a governing design criterion as building heights increase. This study considers the wind-induced acceleration ... -
Multi-resolution wavelet pitch controller for spar-type floating offshore wind turbines including wave-current interactions
Fitzgerald, Breiffni; Basu, Biswajit (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
Fitzgerald, Breiffni; Basu, Biswajit (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 ...