Structure Optimization Desiga And Application Of Composite Lamination For Wind Turbine Plade

As a key component to capture wind energy, the wind turbine blade movementsituations and force circumstances are very complex. The determinant to guarantee WTG’snoble and stable operation is good structure and properties of wind turbines. Fibercomposite wind blade is a typical non-rotating body which has non-uniform thicknessplacement and complex ply structure, and its performance varies from different laminateangles, orders and thicknesses. Therefore, optimization for composite fiber ply structuredesign studies of wind turbine blades, can provide theoretical basis and technical supportfor the design and manufacture of wind turbine blades.On the basis of explaining the domestic and foreign research status of composite fiberlaminate structure optimization design, and according to the basics, structural optimizationtheory and methods of fiber composite laminates, we developed a suitable program forwind blade structure optimization.The coupling effect of blade performance exits due to the complex couplingmechanism and relationship of its ply parameters. Current technical ways and means couldnot solve this question. Therefore, the paper viewed from the engineering point, used thecombining method of theoretical analysis, finite element analysis and structuraloptimization, established mathematical optimization model, applied hierarchicaloptimization strategy and operated univariate parameter optimization of ply in Optistruct toexplore the optimal laminate scheme of wind turbine blades.The first stage is on the ply angle optimization. On the basis of the laminate stressanalysis, we establish a laminate angle mathematical model in relationship with failurecriterion and strength, set minimum maximum stress of structure as the optimization goal,regard laminate angle as the design variables and use local approximation method tooptimize the ply angle, then we get the laminate angle of wind blade which satisfy theperformance requirements:0°,±45°and90°.The second stage is on the ply thickness optimization. Based on each laminated platestiffness matrix, we establish a laminate thickness mathematical model in relationship withstructural stiffness and mass, set minimum maximum stress of structure as the optimizationgoal, regard blade quality and minimal compliance laminate angle as the target to optimize the laminate thickness, then we get the thickness distribution and basic overall structure ofeach wind blade which satisfy the blade stiffness and mass requirements.The third stage is on the ply sequence optimization. Ensuring that the blades laminateorder meets manufacturing requirements, we establish a mathematical model of stackingsequence and manufacturing constraints, set the laminate rule as constraints to optimize thelaminate order of basic overlay structure, the we get the overlay program which meetstructure and manufacturing requirements.Finally, we optimize the original overlay program, analyze and compare the structure with eachother. The results shows that the optimization programs have a greater degree of reduction of overallstress and strain and verifies the correctness and effectiveness of the optimization programs andmethods.