Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Analysis of Dynamic Response Characteristics for 5 MW Jacket-type Fixed Offshore Wind Turbine

  • Kim, Jaewook (Department of Navel Architecture & Ocean Engineering, Inha University) ;
  • Heo, Sanghwan (Department of Navel Architecture & Ocean Engineering, Inha University) ;
  • Koo, WeonCheol (Department of Navel Architecture & Ocean Engineering, Inha University)
  • Received : 2021.06.16
  • Accepted : 2021.08.02
  • Published : 2021.10.31
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Abstract

This study aims to evaluate the dynamic responses of the jacket-type offshore wind turbine using FAST software (Fatigue, Aerodynamics, Structures, and Turbulence). A systematic series of simulation cases of a 5 MW jacket-type offshore wind turbine, including wind-only, wave-only, wind & wave load cases are conducted. The dynamic responses of the wind turbine structure are obtained, including the structure displacement, rotor speed, thrust force, nacelle acceleration, bending moment at the tower bottom, and shear force on the jacket leg. The calculated time-domain results are transformed to frequency domain results using FFT and the environmental load with more impact on each dynamic response is identified. It is confirmed that the dynamic displacements of the wind turbine are dominant in the wave frequency under the incident wave alone condition, and the rotor thrust, nacelle acceleration, and bending moment at the bottom of the tower exhibit high responses in the natural frequency band of the wind turbine. In the wind only condition, all responses except the vertical displacement of the wind turbine are dominant at three times the rotor rotation frequency (considering the number of blades) generated by the wind. In a combined external force with wind and waves, it was observed that the horizontal displacement is dominant by the wind load. Additionally, the bending moment on the tower base is highly affected by the wind. The shear force of the jacket leg is basically influenced by the wave loads, but it can be affected by both the wind and wave loads especially under the turbulent wind and irregular wave conditions.

Keywords

Acknowledgement

This study was supported by grants of the Korean-English Offshore Plant Global Expert Training Project of the Ministry of Trade, Industry and Energy and the Korea Institute for Advancement of Technology and Technology Study Abroad of Daewoo Shipbuilding Engineering Co., Ltd. This study was also supported by a grant of the Basic Research Project in Science and Engineering Areas of the National Research Foundation of Korea (NRF-2018R1D1A1B07040677).

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