Vibration damping and finite element analysis of a 10 MW jacket-type offshore wind turbine

As offshore wind farms are increasingly deployed in icy regions, wind and ice loads are likely to simultaneously affect Offshore Wind Turbines (OWTs), posing risks such as foundation overturning. To mitigate excessive vibrations caused by wind-ice interactions, this study proposes replacing the original hollow steel legs of the jacket structure with a concrete-filled double-skin Steel Tubes (CFDST) structure. To verify the vibration control performance of the composite structure, a scaled Joint Offshore Wind Turbine (JOWT) wind-ice joint loading test was designed using the MTS hydraulic servo system for combined wind-ice loading. Experimental results show that the new CFDST composite structure effectively reduces vibrations induced by wind-ice interactions. For instance, at the tower's apex, the peak displacement and acceleration decreased by 22.73 % and 50.69 %, respectively. The vibration reduction performance of the composite structure with different hollow ratios was analyzed using ANSYS-APDL software, indicating that a 40 % hollow ratio steel pipe exhibited the best vibration resistance. Furthermore, under extreme ice loading, the CFDST composite structure demonstrated superior ultimate bearing capacity compared to the original structure.