Enhancing Seismic Resilience in Offshore Wind Turbines: A Leap Forward with Advanced Modeling 

The quest for sustainable energy solutions has propelled offshore wind turbines (OWTs) to the forefront of renewable energy infrastructure. However, the seismic resilience of these towering structures remains a topic of extensive research, especially as they venture into regions fraught with seismic threats. Recent scholarly papers and an insightful webinar have shed light on the complexities of assessing and enhancing the seismic resilience of OWTs, marking a significant advancement in our understanding and capabilities in this field. 

A deep dive into the seismic assessment of OWTs reveals the nuanced interplay of forces these structures must withstand—not just from fierce winds but also from the unpredictable might of earthquakes. Traditional models have often fallen short of capturing this dynamic interplay accurately. Monopile OWTs are a testament to the need for a more granular understanding of how seismic forces interact with these seemingly simple yet complex structures. 

The transition from simplified dynamic models to more sophisticated simulations has been pivotal in addressing the seismic vulnerability of OWTs. A detailed webinar led by Dr. Raffaele De Risi highlights this transition, emphasizing the shift toward holistic modeling approaches. The introduction of STKO (Scientific ToolKit for OpenSees) into the modeling process represents a significant leap forward, offering a robust platform for constructing, analyzing, and post-processing complex models with unprecedented efficiency and accuracy. 

STKO’s integration facilitates the conversion of traditional parametric models into detailed simulations within the OpenSees environment. This capability has been instrumental in moving beyond the limitations of previous models, enabling the detailed representation of every turbine component, including the intricate dynamics of the rotor-nacelle assembly (RNA). The software’s advanced modeling features include rotary inertia, rotor eccentricity, and the blades’ flexibility—aspects critical to the nuanced understanding of OWTs under seismic stress. 

The research and discussions underscore the need for longstanding assumptions in the seismic assessment of OWTs. Contrary to previous beliefs, OWTs are significantly affected by seismic hazards, necessitating a comprehensive approach to their design and analysis. The studies reveal that superior vibration modes, multidirectional analysis, and the vertical component of seismic actions must be considered when designing resilient structures. 

STKO emerges as a tool and a catalyst for innovation in seismic resilience for OWTs. STKO addresses the gaps in modeling and assessment practices by enabling detailed and sophisticated simulations. Its capacity to streamline the modeling process and the flexibility to adapt to the unique challenges of seismic analysis positions STKO as an indispensable resource in the quest for safer, more reliable OWT designs.  

The journey towards seismic resilience in offshore wind turbines is marked by continuous learning and adaptation. Recent research and technological advancements, particularly the integration of STKO, have provided valuable insights into the complex dynamics at play. As we forge ahead, embracing these insights and the capabilities of advanced modeling tools will ensure that offshore wind energy remains a viable and sustainable part of our energy future. In this evolving landscape, comprehensive, accurate modeling cannot be overstated, serving as the foundation upon which safer, more resilient offshore wind turbines will be built. 

    You can learn more about this by watching our webinar led by Dr. Raffaele De Risi on our YouTube channel : 

    “Offshore Wind Turbines in Seismic Regions: Simplified Structural Modelling, Myths, and Fallacies. https://www.youtube.com/watch?v=3trWY_C5sWM​”

     

    Sources

     

    Offshore Wind Turbines in Seismic Regions: Simplified Structural Modelling, Myths, and Fallacies Webinar by Dr Raffaele De Risi, PE, FHEA and Asdea STKO. (2024) Offshore Wind Turbines in Seismic Regions: Simplified Structural Modelling, Myths, and Fallacies. – YouTube 

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