Analysis And Optimization Of Coupling Effects Of Ply Parameters On Wind Turbine Blade Performance

As a key component of wind turbines,composite fiber blades directly affect the safe and stable operation and service life of wind turbines.With the blade size increase,so does the performance requirement for the stiffness and strength of the blade.The ply structure of the blade determines its performance is affected by both the single ply parameter and the coupling of the ply parameters.Therefore,controlling the ply parameters in the blade forming process is the key to ensure the blade performance.The thesis starts with the basic theory of composite materials,and takes the 1.5MW wind turbine blade as the research object.The coupling mechanism and Macro-effect law of ply parameters on blade performance are analyzed by means of test design,numerical simulation and multiple regressions,and the ply parameters are optimized.The prediction and control method of blade performance are mastered,and the blade performance is improved.The main research work of the thesis is as follows:Firstly,Aiming at the optimization problem of discrete variables of stacking sequence,the mathematical relationship between the bending and torsion stiffness matrix and the positive axis stiffness invariant is established by designing the bending and torsion stiffness matrix of the composite material,and the quantization of stacking sequence is realized.Secondly,aiming at the influence of ply parameters on the blade performance during the blade forming process,the ply parameters(ply angle,±X° staking thickness ratio,stacking sequence)as the independent variable,the blade performance index(Tsai-wu failure factor,maximum displacement)as the dependent variable.The test scheme is designed by uniform test design method.The static strength and stiffness of the blade are simulated and analyzed in Abaqus,and the coupling effect of the ply parameters on the blade performance is analyzed.The mathematical model between the ply parameters and the blade performance indexes was established by multiple regression analysis,and the significance of the regression model was verified.On this basis,the influence curve and surface map of ply parameters on the blade performance are fitted based on the regression model,and the macroscopic influence law of the single factor and two-factor coupling on the blade performance is analyzed.The value of the optimal ply parameters is obtained.Finally,on the basis of the better ply parameter range,the test scheme is redesigned for simulation analysis.The partial least squares regression method is used to analyze the simulation results,and two single objective optimization mathematical models of blade strength and stiffness are established.The weight of each objective is calculated by analytic hierarchy process and the consistency test is carried out.The single objective optimization mathematical model is transformed into a multi-objective optimization mathematical model by weighted summation.Based on the mathematical model of multi-objective optimization,the simulated annealing algorithm is used to globally optimize the ply parameters,and the plyparameters of blade comprehensive performance optimal are obtained.The performance of blade before and after optimization is contrasted and verified,and the optimized blade performance is improved.The feasibility and effectiveness of the method are verified.The research results of the thesis can provide the necessary theoretical basis and technical support for the research of ply control and performance optimization of composite fiber wind turbine blade.