Optimization of mooring stability for large semi-submersible offshore wind turbine platforms
The stability of the platform is the fundamental guarantee for the safe operation of floating offshore wind turbines.In this paper,the motion response of a 15MW semi-submersible offshore wind turbine platform is investigated,and the stability of the platform is improved by adding a ballast block on mooring cable and adjusting the weight of the ballast block and the distance between the ballast block and the guide hole to optimize the mooring system.The motion response and response surface are obtained by using software ANSYS-AQWA and ANSYS-Workbench.Result from the response surface analysis shows that the motion response curves generated by the mass of ballast block and the distance between the ballast block and the guide hole on the mooring cable parallel to tidy current have the same trend,and the increase of its value can effectively suppress longitudinal and drooping oscillations,but increase the longitudinal rocking.Finally,the response surface was used to optimize the mooring system,in which the amplitude of longitudinal oscillation of platform was reduced by 52.6%,the amplitude of pitching oscillation was reduced by 12.73%,and the amplitude of longitudinal rocking was reduced by 6.67%under the safty guaranteeing of mooring.
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