Study on vibration reduction performance of stay cable self-centering composite jacket offshore wind turbine

Offshore wind turbine is a highly flexible structure. The displacement of the tower is obviously amplified by the earthquake, which makes the whole structure produce a large amplitude of vibration, and is more sensitive to the long-period ground motion rich in low-frequency components. This paper proposes a self-centering CFDST composite jacket vibration reduction structure system with stay cables. Using ANSYS, self-centering composite jacket wind turbine models was established to conduct long-period seismic dynamic time history response analysis. The study investigates the dynamic response of the novel composite jacket offshore wind turbine under long-period seismic actions and the vibration reduction performance of the stay cables. The results show that the overall vibration reduction effect of the self-centering composite jacket proposed in this paper on the long-period ground motion can reach more than 60%. The vibration reduction effect of the acceleration amplitude at the top and bottom of the tower is 61.3% and 52.9% respectively, and the peak displacement is reduced by 70.1%. Even under the action of long-period giant earthquakes, the self-centering ability of the self-centering composite jacket to the tower is as high as 98.1%, significantly enhancing the stability of offshore wind turbines.