Performance Analysis And Research Of Sliding Yaw Bearing In The Wind Turbine

The yaw bearing is the most crucial component of horizontal axis wind turbines. The study of the efficiency of yaw bearing can find the weak point in the turbine design, and also optimize the design. In addition, it can provide the reference of safety operation in the future study. This thesis compares the two main types of yaw bearing, the roller yaw bearing and the sliding yaw bearing. It presents the theory and the structure of sliding yaw bearing and minimization of the tuning friction. I used the Bladed to simulate different wind turbine work conditions and calculated the critical load of yaw bearing. First I developed the three-dimension model of gliding yaw bearing equipped with gear teeth at outer edge using the UG model. Then introduced the finite element method to analysis the model with Ansys. The force analysis of the outer edge gear teeth showed its stress changing based on environment conditions. From the modal analysis and spectrum analysis, I calculated the maximum oscillation of yaw bearing and its corresponding frequency, yaw bearing structure over time the dynamic response of loads, to avoid run-time for the fan to provide a reference resonance. Taking into account yaw system frequently start and stop features, focusing on the yaw bearing outer ring gear in the transient impact loads to analyze the dynamic characteristics, and its static analysis to compare the results, emphasizing the impact of reducing transient the importance of the yaw bearing loads. Yaw bearing on the static and dynamic loading numerical simulation and calculation, can be prone to failure to identify its location and weak links in the optimal design and manufacturing, the improvement of bearing processing method to further improve bearing performance indicators.