A section of a wind turbine tower is taken as the research object,and the finite element method is used to calculate the critical stress of elastic instability of the tower under the ideal state.The accuracy of the finite element model is verified by comparing it with engineering algorithm.Based on the finite element model,a method is proposed for analyzing the pit defect in wind turbine towers,using the maximum circumferential,axial,and radial dimensions of the pit.A pit defect of specified dimen-sions is created by loading,and a linear buckling analysis is carried out for the parameters of pit position,angle,and dimensions.The results show that the presence of the pit drastically reduces the linear buckling eigenvalue of the tower with the eigenvalues being sensitive to pit defect in the following descending order:short and long axis ratio,depth,position,and angle.
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