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Dynamic responses and mooring line failure analysis of the fully submersible platform for floating wind turbine under typhoon
Abstract The mooring line of the floating platform may fail due to various reasons in long-term service conditions, such as overloading, accidental conditions, and performance deterioration. Combining the advantages of three types of floating offshore wind turbine (FOWT) platforms, i.e., spar type, semi-submersible platform type, and tension-leg platform (TLP) type, a novel fully submersible platform (FSP) with vertical CFRP tendons and circumferential catenary chains was developed. The commercial hydrodynamic software ANSYS-AQWA is used to analyze the dynamic responses and mooring forces of the FSP under different wind speeds. It is assumed that a certain mooring line is disconnected from the platform when its safety factor is smaller than the threshold value. The influence of the mooring line failure on the motion characteristics of the platform and the states of the remaining mooring lines are analyzed. Simulated results show that the failure of mooring lines mainly affects the responses of sway, roll, and yaw, which is closely related to the stiffness and symmetry of the mooring system. Once a mooring line fails abruptly, the equilibrium of the mooring is disturbed and the mooring forces are redistributed, leading to a continuous failure of the same type of mooring on the same side, but the entire structure remains stable without overturning, indicating that the mooring system has good redundancy under extreme conditions.
Highlights Response amplitude operators of the fully submersible platform (FSP) for offshore wind turbine are given out. The dynamic responses of the FSP under different types of typhoons are investigated considering wind and wave loads simultaneously. The continuous failure of moorings is simulated and the corresponding responses of the FSP are obtained. It is verified that the FSP possesses sufficient safe margin under extreme conditions.
Dynamic responses and mooring line failure analysis of the fully submersible platform for floating wind turbine under typhoon
Abstract The mooring line of the floating platform may fail due to various reasons in long-term service conditions, such as overloading, accidental conditions, and performance deterioration. Combining the advantages of three types of floating offshore wind turbine (FOWT) platforms, i.e., spar type, semi-submersible platform type, and tension-leg platform (TLP) type, a novel fully submersible platform (FSP) with vertical CFRP tendons and circumferential catenary chains was developed. The commercial hydrodynamic software ANSYS-AQWA is used to analyze the dynamic responses and mooring forces of the FSP under different wind speeds. It is assumed that a certain mooring line is disconnected from the platform when its safety factor is smaller than the threshold value. The influence of the mooring line failure on the motion characteristics of the platform and the states of the remaining mooring lines are analyzed. Simulated results show that the failure of mooring lines mainly affects the responses of sway, roll, and yaw, which is closely related to the stiffness and symmetry of the mooring system. Once a mooring line fails abruptly, the equilibrium of the mooring is disturbed and the mooring forces are redistributed, leading to a continuous failure of the same type of mooring on the same side, but the entire structure remains stable without overturning, indicating that the mooring system has good redundancy under extreme conditions.
Highlights Response amplitude operators of the fully submersible platform (FSP) for offshore wind turbine are given out. The dynamic responses of the FSP under different types of typhoons are investigated considering wind and wave loads simultaneously. The continuous failure of moorings is simulated and the corresponding responses of the FSP are obtained. It is verified that the FSP possesses sufficient safe margin under extreme conditions.
Dynamic responses and mooring line failure analysis of the fully submersible platform for floating wind turbine under typhoon
Zhang, Zihua (Autor:in) / Wang, Xiaoqian (Autor:in) / Zhang, Xiaoyu (Autor:in) / Zhou, Chunheng (Autor:in) / Wang, Xuan (Autor:in)
Engineering Structures ; 301
11.12.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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