Structural strength analysis of new semi-submersible offshore wind power platform

Aiming at the problem that the existing single-column wind power platform cannot work normally under the extreme sea conditions of strong typhoons, a VX type semi-submersible platform is proposed. The hydrodynamic finite element model of the platform is established by using AQWA software. The frequency domain and time domain calculation are carried out based on the three-dimensional potential flow theory, and the combined effects of wind, wave and current load are considered. The hydrodynamic analysis of the floating platform structure and the overall structural strength analysis are carried out under four working conditions, typhoon, towing and maintenance. ANSYS/Fatigue software is used to analyze the fatigue damage at the hot spot of the platform under working conditions, and the fatigue life is calculated according to S-N curve. The results show that the overall strength of the VX semi-submersible platform under various working conditions can meet the requirements of the specification, and the overall life of the platform can meet the design life of more than 25 years.