Dynamic Response Analysis Of The Overall Structure Of The Fixed Offshore Wind Turbine Based On The Suction Bucket

In the context of the national dual carbon policy,the offshore wind power industry has attracted much attention.The offshore environment is complex,and the long-term effects of wind,wave and current loads play a decisive role in the structural design of wind turbines.At present,approximation or decoupling simulation methods are mostly used to analyze the dynamic characteristics of fixed offshore wind turbine structures,which weakens the coupling effect between the wind turbine structures under multiple loads,and cannot accurately predict the coupled dynamic response of offshore wind turbines.Therefore,the establishment of the coupled analysis model of the overall dynamic response of the offshore wind turbine has important engineering value to ensure the long-term stable service of the offshore wind turbine.In this thesis,the fixed offshore wind turbine with suction bucket foundation is used as the research object,and a coupled model of the overall dynamic response of the offshore wind turbine is established.The model fully considers nonlinear random dynamic loads and accurately simulates the nonlinear interaction between the wind turbine foundation and soil.Based on the overall analysis model of the suction bucket foundation fixed offshore wind turbine established in this thesis,the structural dynamic response analysis is carried out under the multi-working condition and multi-load combination mode.The analysis shows that the suction bucket foundation has good stability below the water depth of 50 meters.Then,considering the most unfavorable load combination of the structure,the optimization design of the parameters of the suction bucket was carried out for the current mainstream 5MW offshore wind turbine with the goal of economy.The results show that when the amount of steel used for the suction bucket structure is fixed,the ultimate bearing capacity of the suction bucket foundation has a nonlinear relationship with the diameter-to-length ratio.excellent.The research results of this thesis provide design basis and theoretical support for practical engineering.