Abstract
Taking the wind turbine tower as the research object, based on the finite element software, a simplified beam-shell hybrid element model was first established; through the simulation, the phase difference between the loose position and the unloose position was compared to verify the feasibility of the phase difference detection method; Secondly, the influence of the number of loose bolts, the position of loosening, and the magnitude of the wind force on the phase of the flange bolt connection structure and the response characteristics of the system are analyzed. The research results show that the number of loose bolts, the position of loosening, and the magnitude of the wind have certain effects on the phase difference and response characteristics of the flange. With the increase in the number of loose bolts, the connection stiffness of the bolt connection continues to decrease. The linear characteristic is enhanced; the closer the loosening is to the excitation force loading position, the greater the detected phase difference; as the wind increases, the phase of the upper flange of the tower changes, and the phase of the lower flange remains unchanged, and the wind is on the flange The disc connection strength has little effect.
Highlights
The wind turbine includes five parts: blades, hub, main shaft, nacelle and tower, among which all the weight of the wind turbine is borne by the tower
The issue of uneven foundations is involved in the construction field, and the relevant literature is relatively abundant. [4,5], there are many studies on the inclination of the tower [6]. It can be seen from the literature that there are few studies on the phase difference of flange bolt connections, and there are fewer studies on the effect of wind on the loosening of wind turbine tower bolts
The finite element analysis method based on Ansys Workbench is used to establish a This article first studies the feasibility of the phase difference detection method on the tower
Summary
The wind turbine includes five parts: blades, hub, main shaft, nacelle and tower, among which all the weight of the wind turbine is borne by the tower. The height of a large wind turbine energy exceeds. [4,5], there are many studies on the inclination of the tower [6] It can be seen from the literature that there are few studies on the phase difference of flange bolt connections, and there are fewer studies on the effect of wind on the loosening of wind turbine tower bolts. Finite element analysis is used to study the phase of bolt loosening and the strength of flange bolt connection through different amounts of loosening, different positions and different wind speeds, which provide a basis for monitoring the loosening of tower bolts
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