Research And Application Of Performance Eq-uivalence Agorithm Of Composite For Large Scale Wind Turbine Blade

The wind turbine blades are the key components of the wind energy capture, thesituation of movement and force is very complex. Its reliable quality and superiorperformance are the determinants which ensure the wind turbine generator system isnormal and stable operation. When the blade was done the strength and fatigue analysis,Modeling process is cumbersome for laminated element model which is establishedaccording to the actual layer structure, mechanics analysis of difficulties, large amount ofcalculation and low efficiency. For these problems, from the engineering point of view,the papers research and prove the suitable large wind turbine blade compositesperformance parameters of the equivalent algorithm.On the basis of the analysising the composite performance’s equivalent algorithmcharacteristics and scope of at home and abroad, combines with large-scale wind turbineblade composite structure characteristics, which are complex Layer, unequal thickness,and material orthotropic, focuses on studying the equivalent algorithm basing on thesub-layer equivalent algorithm and energy method. wind turbine blades lamination hasproperties of three orthogonal to the symmetry plane, by deformation energyconservation theory, derives orthotropic composite material stiffness matrix; to improvethe sub-laminate method, obtaines material performance equivalent parameters by thesublayer stiffness formula. Meanwhile,According to the characteristics, which stress fieldand strain field are same between the composite material microstructure and equivalenthomogeneous body under certain conditions, using the theory of deformation to deducethe relationship between performance equivalent parameters and material microstructuredeformation energy, by the conversion of different forms deformation energy formulate,expand from two-dimensional to three-dimensional field, and derives performanceparameters equivalent algorithm.Taking a three-way laminated plate as an example, calculate its performanceequivalent parameters by using the sub-laminate method and energy method, andcompares with the experimental data. In a1.5MW wind turbines blade as an object,calculate the actual lamination structure composite performance equivalent parametersbased on the sub-laminate method and energy method establish the model of the actuallaminated element and the performance equivalent, after Static strength simulation analysis, It turned out that, three cases of stress and strain distribution trend areconsistent,extreme close. Verify the feasibility, validity and correctness of thesub-laminate method and the energy method both performance equivalent algorithms.Finally, Check the strength of blade root to verify its structural design and safety.Thesis research results for the prediction of composite component performanceparameters to provide theoretical basis and application reference, provides an efficientand practical method for large wind turbine blade structure analysis and optimizationdesign.