The Coupling Effect Analysis And Application Of Layer Parameters On The Wind Turbine Blade's Performance

Blade is the key to capturing wind energy components of wind turbine,and stress is very complex,its structure stiffness and stability is the key to decide the normal operation of the wind turbine.The layer parameters determine the blade structural performance and the coupling effect exists between them.Based on expounding the blade structure layer optimization design research status at home and abroad,the main research contents and technical route were determined.The ply angle,0 degree layer thickness ratio and stacking sequence as independent variables,the blade strength index-Tsai-wu effectiveness factor and stiffness index-the maximum displacement of U as response variables.Based on the principle of first order response surface design,the Taguchi method was used to design the test scheme in Minitab,analyzed the blade's static strength and stiffness.The mapping relations between the layer parameters and the Tsai-wu failure factor and the maximum displacement U were established by multiple linear regression analysis and the regression equation,the significance of each factor regression coefficient test;The results showed that the layer parameters to the blade strength and stiffness effection of significant size were: 0 degree layer thickness ratio > ply angle > stacking sequence,and with the increase of ply angle and 0 degree ply thickness ratio,strength and stiffness were improved.Through visual analysis,variance analysis and coordinate analysis,the optimum parameters of initial layer parameters were obtained.According to the range of the parameters of the first order response surface design,according to the design principle of the second order response surface,the different levels of the layer parameters were reconstructed.The static strength and stiffness of the blade were simulated and analyzed by Box-Behnken test design method in Design-Expert 8;Second order coupled mapping relations between the layer parameters and the Tsai-wu failure factor and the maximum displacement U were established by multiple linear regression analysis,and the mathematical model and the parameters of each layer were tested;analysed single layer parameter and layer parameters interaction effects on blade structural performance,the parameters of the layer parameters were optimized.The results showed that the layer parameters to the blade strength and stiffness effects of significant size were: 0 degree layer thickness ratio > layer angle > stacking sequence,the interaction between the ply angle and 0 degree ply thickness ratio was a significant coupling interaction effect on the strength,the rest interaction items were on the strength and stiffness no obvious coupling effect.The final optimized showed:the ply angle was 46 degrees,0 degree ply thickness ratio was 28% and the stacking sequence was C1,blade static structural strength was optimal;ply angle was 44 degrees,0 degree ply thickness ratio was 20% and the stacking sequence was C3,blade static structural.stiffness was optimal.Through the analysis of the coupling effect of the layer parameters on the blade structure performance,it provided the necessary reference value for solving the problem of how to design and realize the fiber layer so that the blade performance is optimal.