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<p>Offshore renewable energy is a clean and inexhaustible energy resource with the potential to supply over 2TW of energy worldwide. Floating offshore wind turbines are emerging as a key solution to harness this renewable energy. With the rapid expansion of the offshore wind energy market, there is increasing potential to integrate diverse technologies to optimize marine energy utilization, particularly wave energy. The existing design approach for offshore structures typically treats uncertain variables as deterministic, leading to either over-engineered or under-engineered designs. This study presents a purpose-developed reliability assessment framework for a hybrid wave-wind floating platform that incorporates three Oscillating Water Columns (OWCs) into a spar buoy. This framework is significant as it provides a systematic approach to account for uncertainties in the design parameters, thereby enhancing reliability and safety of the structure. A coupled aero-hydro-structural dynamics model was developed using tools such as AQWA ANSYS©, verified against the results reported in the literature. The structural responses obtained from the model simulation are employed in deriving the Limit State Function (LSF), which is then incorporated into the iterative First-Order Reliability Method (FORM) algorithm to calculate the fatigue reliability indices of the structure. The <i>S</i>–<i>N</i> curve-based fatigue reliability results revealed that, under inherent stochastic conditions, the structural assembly could safely withstand such conditions as the reliability index values remain within acceptable limits, while the Fracture Mechanics method suggested otherwise. Consequently, an optimization exercise of critical components was subsequently performed based on fracture reliability assessment to achieve target reliability.</p>

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Reliability assessment of a hybrid floating wind turbine concept based on coupled aero-hydro-structural dynamics

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Abdulhakim Adeoye Shittu,
  • Gabriel Siquera Machado,
  • Jixiang Zhang,
  • Milad Shadman,
  • Segen Farid Estefen

摘要

Offshore renewable energy is a clean and inexhaustible energy resource with the potential to supply over 2TW of energy worldwide. Floating offshore wind turbines are emerging as a key solution to harness this renewable energy. With the rapid expansion of the offshore wind energy market, there is increasing potential to integrate diverse technologies to optimize marine energy utilization, particularly wave energy. The existing design approach for offshore structures typically treats uncertain variables as deterministic, leading to either over-engineered or under-engineered designs. This study presents a purpose-developed reliability assessment framework for a hybrid wave-wind floating platform that incorporates three Oscillating Water Columns (OWCs) into a spar buoy. This framework is significant as it provides a systematic approach to account for uncertainties in the design parameters, thereby enhancing reliability and safety of the structure. A coupled aero-hydro-structural dynamics model was developed using tools such as AQWA ANSYS©, verified against the results reported in the literature. The structural responses obtained from the model simulation are employed in deriving the Limit State Function (LSF), which is then incorporated into the iterative First-Order Reliability Method (FORM) algorithm to calculate the fatigue reliability indices of the structure. The S–N curve-based fatigue reliability results revealed that, under inherent stochastic conditions, the structural assembly could safely withstand such conditions as the reliability index values remain within acceptable limits, while the Fracture Mechanics method suggested otherwise. Consequently, an optimization exercise of critical components was subsequently performed based on fracture reliability assessment to achieve target reliability.