Optimization Of Ply Parameters Of Composite Wind Turbine Blade Based On DMO

The forming of composite wind turbine blade is a complex process of multi-phase material,multi-parameter and multi-objective.With the increase of the power and size of the blade,the performance requirement of the blade is higher and higher.The performance of the blade is different because of the combination of different ply parameters.Because the composite fiber has the property of anisotropy and the fiber angle is not a continuous variable but a finite discrete variable,the fibers with different ply angles can be regarded as different materials,so the ply angle optimization is transformed into the topological optimization problem of discrete multiphase materials.If the lay angle of each layer of the blade is determined,the ply sequence and the thickness of each layer of the fiber are also determined.In order to further give full play to the potential of the design of ply parameters,this paper takes wind turbine blades as the object to carry out the research on the optimization design of the parameters of the discrete multiphase material layering.The main work completed is as follows:Based on the research status of composite fiber wind turbine blade structure optimization at home and abroad,and according to the theory of discrete multi-phase material topology optimization,a method of optimizing the ply angle of wind turbine blade micro-element based on the combination of discrete material optimization method and genetic algorithm is proposed.The finite element software is developed by programming language.Finite element software is used to analyze the discrete multiphase material topology optimization program,and the results of finite element analysis are extracted for genetic algorithm optimization,thus completing the discrete multiphase material topology optimization design.According to the theory and method of discrete material optimization,the mathematical model of discrete multiphase material topology optimization for composite fiber wind turbine blades was established by using the method of DMO,with the Angle of the micro-element layer as the design variable,the minimum stress as the constraint condition,and the maximum stiffness as the objective function.Finite element analysis of composite fiber wind turbine blade was completed in Abaqus software,and the sensitivity information of structural response quantity to fiber Angle phase variable was derived by sensitivity analysis method.The mathematical model for the topological optimization of discrete multiphase materials on blades was solved by genetic algorithm,and the optimal ply Angle of each layer of blades was obtained.The performance of the blade before and after optimization is compared and analyzed,and the results showed that the performance of the optimized blade was significantly improved.It is reasonable and feasible to establish a mathematical model of discrete multiphase material topology optimization for composite fiber wind turbine blades based on discrete material optimization method and apply genetic algorithm to solve the problem.The research results of this paper can lay a necessary theoretical foundation and technical support for the design,manufacture and control of composite fiber laying structural parts in engineering practice.It has extremely important practical significance and strong engineering application background.