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Study on structural dynamic response of offshore wind turbine under floating ice load
Xin Guan1, Hua Yu2, Ying Yuan3
1Shenyang Institute of Engineering, Shenyang, 110136, China. xin_guan@sina.com.
Scientific Reports
|May 16, 2025
Summary
This study analyzed offshore wind turbine dynamics under combined wind, wave, and ice loads. Coupled loads increase displacement and bending moments but surprisingly reduce cumulative fatigue damage compared to individual load effects.
Area of Science:
- Engineering
- Renewable Energy
- Oceanography
Background:
- Offshore wind turbine safety and reliability depend on understanding structural dynamics.
- Single load analyses are insufficient for complex offshore operational conditions.
Purpose of the Study:
- To investigate the dynamic response of 5 MW offshore wind turbines under combined wind, wave, and ice loads.
- To compare the effects of individual and coupled loads on structural responses and fatigue damage.
Main Methods:
- Developed a 3D turbulent wind field model using the Kaimal spectrum.
- Created a floating ice mathematical model incorporating the Kärnä ice force spectrum.
- Utilized OpenFAST and EDEM for simulating combined wind-wave-ice load effects.
Main Results:
- Coupled wind-wave-ice loads result in greater tower top displacement and foundation bending moments than individual loads.
- Cumulative fatigue damage under coupled loads is lower than under individual loads.
Conclusions:
- Combined environmental loads significantly influence offshore wind turbine structural dynamics.
- The interplay between different loads has a complex effect on fatigue, necessitating comprehensive analysis.
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