Strength Reliability Analysis Of Wind Turbine Blade Based On Response Surface Method

Blade is one of the key components in wind turbine, which reliability is directly related to the safe operation of wind power generating units. Aiming to the strength reliability analysis of wind turbine blade with implicit performance function, 600kw horizontal axis wind turbine blade is used as object of study in this paper, and its three-dimensional finite element parametric modeling is set up, its aerodynamic loads calculation based on blade element momentum (BEM) theory and stress analysis are carried out. Considering the randomness of blade geometric parameters, material parameters and load parameters, the deterministic finite element method, response surface methods (including multinomial response surface method and artificial neural network response surface method) and Monte Carlo Simulation Method are combined to be used to carry out the static strength reliability analysis. At the same time, the blade performance function is determined by using Tsai-Hill theory and failure mechanism of composite materials laminates board. Finally, the direct Monte Carlo simulation method is used as a relatively exact solution, the reliability analysis methods of different response surface are compared and analysed.