Analysis of the ice excitation vibration response of large wind turbines on duct frame based on buckling restrained brace
Large wind turbines on conduit frames located in cold regions are susceptible to ice loads during service and have a significant ice vibration response.In order to ensure the safe operation of the turbine,it is required to have a certain degree of ice resistance.The support members of the conduit frame are generally thin-walled hollow cylindrical structures with relatively large slenderness,which are prone to buckling damage under extreme ice loads and will result in greater ice vibration of the main structure.To solve this problem,a duct frame fan structure based on buckling restrained brace(BRB)is proposed.Taking a large wind tur-bine on four-pile duct frame in Bohai Sea as an example,this study establishes a simplified model of the structure by using ANSYS finite element software.Then,it performs the buckling analysis and replaces the rods prone to buckling with buckling restrained brace.Fi-nally,it conducts a comparative analysis of the vibration response of the wind turbine before and after the replacement under the action of three extruded ice loads.The results show that the BRB wind turbine structure can reduce the peak displacement and peak acceleration at key locations under different squeeze ice loads,especially under Push2 ice load,and the vi-bration response of the structure can be reduced by more than 26%.The research results can provide reference for the study and design of other offshore wind turbine structures of the same type.
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