Study on the reliability for the blade structure of wind turbine

Bending frequency and torsion frequency of blades for wind turbines have been calculated based on two calculating methods: discrete method and consecutive method. The two methods´ calculating results have been compared to analyze the dynamic properties of constant-frequency and varied speed turbine´s blades. An actual megawatt wind turbine´s blade model has been constructed based on finite element analysis. The main factors affecting the modeling process have been discussed, including elemental type, the number of panels, wind loads and restriction. The errors between the calculating results and metric results have been compared, and the vibration shapes of blade have been analyzed. All the results provide the diagnostic theories for fatigue prediction, resonance removal and reliability analysis for wind turbine´s blades design