Study on the Influence of an Internal Stiffening System on the Structural Strength of the Semi-Submersible Structures for a Floating Offshore Wind Turbine

This study presents the development and comparative analysis of a new Y-type floating offshore wind turbine platform based on the existing T-type model. Utilizing advanced simulation tools, such as MSC, Patran and Nastran 2022.3, FEGate For Ship 5.0, and Ansys AQWA 2021 R2, extensive evaluations are conducted on the structural strength, stability, and dynamic response of both the T-type and the newly proposed Y-type platforms. In this research, the structural optimization algorithm based on the above simulation tools is adopted, and its results are compared with preoptimization results to demonstrate the improvements made in design precision and reliability. Results indicate that the Y-type model achieves a maximum reduction in von Mises stress by 30.21 MPa compared to the T-type model, and its heave and pitch motion amplitudes are reduced by 4.3412 m and 4.9362°, respectively, under extreme sea state conditions. Through structural optimization using the Nastran SOL200 module, the column structure weight is reduced by 11.31%, meeting the strength requirements while enhancing efficiency. These findings highlight the Y-type platform’s improved performance and provide robust design strategies for floating offshore wind turbines in deep-water regions, crucial for advancing global renewable energy solutions. Future research should focus on the impacts of different marine conditions on platform performance and consider integrating new materials or innovative design enhancements to further optimize platform functionality. Additionally, due to potential limitations from model simplification, emphasis on real-world testing and validation under operational conditions is recommended. Overall, this research clarifies the differences in structural performance between the T-type and Y-type floating platforms and introduces an improved platform design approach, offering valuable insights and guidance for the future development of floating offshore wind turbine technology.