Structure Topological Optimization Design And Application Of Multi-phase Material For Fiber Wind Turbine Blades

Blade lamination design is a complex process of multi-phase material,multi-parameter and multi-objective,and the existing research is difficult to meet the design requirements.The spatial layout of different composite fibers and soft sandwich materials will produce different leaf skin topology,fiber content,performance and quality.With the development of wind turbines in the direction of high power,lightweight,high performance and low cost,higher requirements are put forward for the performance and weight of blades.It is urgent to give full play to the design potential of material space layout.In view of the specific structure,load and manufacturing constraints of the blade,the composite laminate theory and the multi-phase material topology optimization method are combined to optimize the multi-phase material of the blade by combining theoretical analysis,mathematical modeling,algorithm solution and numerical simulation.Therefore,on the basis of satisfying the static strength design of the blade,the lightweight design of the blade is studied.The main work of this paper is as follows:Based on the theoretical knowledge of composite fiber laminates and the method of multi-phase material topology optimization,a method of multi-phase material topology optimization for wind turbine blades is proposed,which combines ICM method and sequential quadratic programming algorithm.In this paper,Box-Behnken test design method is used to design the test scheme,and different test schemes are simulated in ABAQUS to obtain Tsai-wu failure factor.Based on multiple linear regression analysis and variance analysis,the mapping function between the pavement parameters and the response index is established by taking the pavement parameters as the design independent variables and the blade Tsai-wu failure factor as the response index to measure the static strength of the blade.The significance of the static strength of the blade is tested by the interaction terms of each layer parameter,the layer parameter and the mathematical model.On this basis,numerical optimization is used to obtain the optimal lamination parameters satisfying the static strength of the blade.In order to obtain lighter weight blades,a mathematical model of wind turbine blade topology optimization is established based on independent continuous mapping method,which satisfies the static strength of blades.The sequential quadratic programming algorithm is applied to solve the model.The reasonable spatial layout of composite fibers and soft sandwich materials is obtained.The weight reduction of 166 is achieved on the basis of total mass of blades.The objective of lightweight blades is verified.The effectiveness and feasibility of the method are discussed.Based on the equivalent design method,the optimized blade's topological structure is redesigned by local adjustment.After checking,the static strength of the redesigned blade meets the design requirements.The research results in this paper provide a reference for the structural lamination design and lightweight of large composite fiber wind turbine blades.