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<p>This study presents an innovative methodology that integrates OpenFAST with the finite element analysis, incorporating an efficient hydrostatic stiffness modeling approach for beam elements to evaluate floating offshore wind turbine (FOWT) support structures under large displacements. The research focuses on assessing and comparing the performance of various semi-submersible platforms designed for FOWTs in extreme wind and wave conditions. Key findings indicate that larger FOWTs benefit from reduced steel weight per megawatt due to the increased size of the platform, which lessens the impact of wave loads. Among the platforms analyzed, traditional semi-submersible designs are less favorable due to their extensive bracing systems, which demand more steel and attract greater wave loads, reducing structural efficiency under extreme conditions. Platforms with bracings connected to the center column, owing to their shorter members, offer slight reductions in steel usage and wave-exposed area, leading to improved structural efficiency, whereas pontoon-connected bracings may be more suitable for supporting multiple turbines. Although upper bracing increases weight and wave impact, it enhances tower stability and helps avoid resonance with rotor frequencies. Therefore, center-column bracing configurations are recommended as optimal, while resonance avoidance should guide decisions on adopting upper bracing.</p>

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Study on large-scale floating wind turbine platforms under severe loads

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Shen-Haw Ju,
  • Yi-Chen Huang

摘要

This study presents an innovative methodology that integrates OpenFAST with the finite element analysis, incorporating an efficient hydrostatic stiffness modeling approach for beam elements to evaluate floating offshore wind turbine (FOWT) support structures under large displacements. The research focuses on assessing and comparing the performance of various semi-submersible platforms designed for FOWTs in extreme wind and wave conditions. Key findings indicate that larger FOWTs benefit from reduced steel weight per megawatt due to the increased size of the platform, which lessens the impact of wave loads. Among the platforms analyzed, traditional semi-submersible designs are less favorable due to their extensive bracing systems, which demand more steel and attract greater wave loads, reducing structural efficiency under extreme conditions. Platforms with bracings connected to the center column, owing to their shorter members, offer slight reductions in steel usage and wave-exposed area, leading to improved structural efficiency, whereas pontoon-connected bracings may be more suitable for supporting multiple turbines. Although upper bracing increases weight and wave impact, it enhances tower stability and helps avoid resonance with rotor frequencies. Therefore, center-column bracing configurations are recommended as optimal, while resonance avoidance should guide decisions on adopting upper bracing.