| With the traditional energy coal,oil and other increasingly depleted,renewable energy development in China is increasingly important.The wind energy as a new generation of clean renewable energy,one of its development prospects are quite broad,the development momentum is quite good.China's wind power industry has developed rapidly,especially offshore wind power.However,offshore wind power development has its own special technical difficulties.Special marine environmental conditions to wind turbine design and construction to bring considerable difficulties.Offshore wind turbine design to consider the environmental load is more complex,wind,waves and currents and other loads.These environmental loads play a decisive role in fan structure and design.Where the wave load as the control load of the wind turbine,the size of the load directly determines the shear and overturning moment at the bottom of the tower.At the same time,the wave load has a cyclical and direct impact on the wind turbine.It can be seen that the wave load is of great significance to the design and research of offshore wind turbines.In this paper,based on the hydrogeological conditions of a sea area in Jiangsu Province and the single-pile wind turbine as an example,the three-dimensional finite element modeling has been used to analyze the influence of the different factors under wave action,which are the structural velocity,different elastoplastic model and wave theory,on the dynamic response of wind turbine with single pile structure at sea.The main work of this paper is as follows:1 In this paper the theoretical basis and formula expression of common wave theory-linear wave,STOKES wave and stream function theory is summerized.According to the theoretical basis of each wave theory their respective conditions of application is summed up.The theory of flow function and its numerical solution is introduced emphatically.The Matlab program for solving any class function is written.The solution of the nonlinear equations in the numerical solution of the stream function is transformed into the unconstrained optimization problem by the steepest descent method and the linear fitting method.The algorithm is realized and optimized to improve the convergence of numerical solution of stream function.The stability of the numerical solution is verified by the stability coefficient based on the linear wave and the stokes wave.Based on the Matlab program,the difference between the velocity and the acceleration field under the same wave parameters has been compared.2 In this paper the common elastoplastic constitutive model of soil is summarized.Based on the AQUA platform in finite element software ABAQUS,the distribution method of linear wave and STOKES wave in AQUA platform is introduced,and the wave subroutine UWAVE based on the wave function wave has been designed.3 Based on the hydrological and geological conditions of a sea area in Jiangsu Province,a finite element numerical model of ABAQUS finite element model is established,which is based on the simulation of pile element,solid element simulation of soil and the interaction of pile-soil interaction with nodal degree of freedom.The computational analysis has validated the model reliability.4 In this paper,the dynamic response of single-pile wind turbine under sea wave is analyzed by finite element software ABAQUS.The applicability of different artificial boundaries to wave dynamic analysis and different elastoplastic models,structural speed and wave The influence of the theory on the dynamic response of single pile type wind turbine under the action of wave,and has drawn some conclusions that can be used for reference.5 Based on the working conditions and the situation of offshore wind turbines,this paper puts forward the design criteria of anti-wave for offshore wind turbines,and proposes the load combination and related displacement formulas in the design of pile foundation in offshore wind turbines,and provides corresponding opinions for the design specification documents. |
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