Research And Analysis Of Pitch Bearing In The Wind Turbine

Pitch bearing is one of the special bearings in the wind turbine, the performance and life of which can influnce the running and power generation efficiency of the wind turbine. Due to the pitch bearing's large size,complex structure and loads, there is greater difficulty of design and production for the pitch bearing. The performance and fatigue life of wind turbine bearing produced in China are difficult to meet requirement. This paper analysed pitch bearing by using the modern design theorys and analysis methods,according to the Germanischer Lloyd Guideline for Certification of Wind Turbine and Euro Code.It can provide the reference for designing and producting to pitch bearing, and has theoretical and practical engineering value.Main researches covered in this paper are as follows:â‘ The article analysed the strength of raceway of pitch bearing and area of gear contact, and described the results of analysis, meanwhile, provied the reference for the load distribution of pitch bearing.â‘¡Using the GAP element instead ball to simplify modeling for rolling bearing, comparing the results of FEA with theoretical results to confirm the correctness of simplified modeling. It provides an effective simplified modeling method for complex rolling bearing.â‘¢Analysing the fatigue life of pitch bearing's point of maximum stress, setting the S-N curve for the meterial of pitch bearing according to the GL specification, making the conversion of fatigue load spectrum, and using the MSC.Fatigue software to calculate the total fatigue damage value of pitch bearing. This fatigue method provides a new way of thinking to calculate the bearing'life.â‘£The article computed the strength and fatigue of the inner bolts of pitch bearing, and optimized the bolts of pitch bearing with the finite element method.The result illustrated that the strength and fatigue satisfied the requirement,the finite element method can reflect the stress distribution of bolts factually,and veritified the reasonable optimization for bolts.