Development of fatigue life prediction method and effect of 10-minute mean wind speed distribution on fatigue life of small wind turbine composite blade

摘要: Abstract This study aims to develop a fatigue life prediction method and identify the effect that 10-minute mean wind speed distribution has on of small-scale turbine composite blade. First, combining von Karman isotropic turbulence model Weibull for provided us with 1-Hz full history specific time period. Accordingly, stress spectra at blade's fatigue-critical locations (FCLs) were created by applying tensor, in which interaction between flapwise edgewise bending moments was taken into consideration. The blade can be predicted reliability R = 95% P–S–N curve obtained from constant amplitude tests rainflow cycle counting, cumulative damage rule spectra. To acquire second-order regression equation, nonlinear analysis performed lives, simulated using proposed method. In this variables shape parameter, K, scale C, speed. effects parameters evaluated through sensitivity equations.