Dynamic stress analysis of a blade of wind turbine generator taking into account vertical wind speed gradient

The wind turbines are an important part of the decrease in air pollution by reducing carbon dioxide emissions in the air. Increasing their operational reliability and avoidance the occurrence of accidents are extremely important factors for their efficiency and a key task in their design. For the large wind turbines, with power in the order of megawatts, the authors in their research had been obtained, that due to the wind speed change in a vertical direction, arise dynamical variable loads of the turbine blades that are functions of the azimuth angle (the angle of rotation). Also, the longitudinal turbulence of the wind speed introduces additional dynamic excitation. As a result, they cause significant fatigue loads, impaired work performance and reduction of the inter-repair periods, and last but not least, excite a strong increase in the vibration and acoustic emission transmitted to the environment, with all the ensuing harmful consequences. The investigation of the stress caused by these dynamic loads on the turbine blades in the axial direction is the main publication task. The turbine blade is considering as the Euler-Bernoulli beam. The finite element method is applied in for the solving of the obtained model.