Research On Vibration Damage Mechanism Of Steel-concrete Composite Tower

the world energy crisis intensifies,wind energy,as a renewable energy source,has the characteristics of wide distribution,large storage capacity,and renewable energy.In recent years,with the increase in the installed capacity of wind turbines,the height of the tower has become higher and higher.Traditional steel towers have become increasingly prominent due to their large bottom diameter,difficult transportation,and poor economy.Research on new steel-concrete towers has become a hot topic at home and abroad.The new steel-concrete combination wind power tower combines the advantages of concrete structure and steel structure,and fully exerts the synergy of the two materials of steel structure and concrete.The two are combined to establish the upper part as the steel tower section and the lower part as the concrete tower section.Combination.During the operation of the wind turbine,there are many factors for the stable operation of the structure,such as structural resonance,ground motion,wind-induced load,etc.,structural damage and damage are prone to occur under the action of power.Therefore,the wind turbine combination tower in the dynamic role The response law and damage mechanism are very important.Based on this,this paper builds a three-dimensional finite element model of the steel-concrete composite tower of the wind turbine,analyzes the response and damage law of the composite tower under the action of ground motion;studies the foundation structure of the steel-concrete composite tower under fluid-solid coupling The vibration damage mechanism aims to provide theoretical support for the development and stable operation of wind turbines.This article mainly includes the following:(1)The coupling mechanism,governing equations,common turbulence models and dynamic mesh updating methods of fluid-structure coupling are introduced.The MpCCI multiphysics solution process and the calculation method used in the coupling process are analyzed.(2)Establish the "foundation-foundation-tower-blade" integrated model,perform modal calculation on the steel-concrete composite tower based on modal theory,and analyze the self-vibration characteristics of the combined tower of the wind turbine.(3)On the basis of(2),based on the theory of elastoplastic damage mechanics,the plastic damage constituency is introduced into the model to study the response and damage law of the composite tower under the action of ground motion.(4)A classic cylindrical flow model and a simple three-dimensional channel model were established to verify the correctness of the fluid-structure coupling method.When the fluid-structure coupling analysis of the composite tower was carried out,the steel-concrete composite tower was selected Turbulence model,the aerodynamic effect of the combined tower-turbine blade and the structure of the wind turbine at different wind speeds is analyzed,and the damage law and destruction mechanism of the tower are studied.