Multi-objective optimization of blade structure of H-type vertical axis wind turbine under composite load
In order to improve the structural performance of H-type vertical axis wind turbine blades under the combined loads of aerodynamic force,centrifugal force and gravity,a multi-objective optimization method was proposed.A mathematical optimization model was established with the minimum mass and maximum stress as the objective function and the maximum deformation as the constraint.Through the Fluid-Structure-Interaction(FSI)method,the real-time and accurate extraction of the blade surface pres-sure was realized,and the finite element model of the blade under the combined load was established.Based on Optimal Space-Filling(OSF)method and Kriging model,the response surface model of each variable to stress,mass and deformation was estab-lished,and the sensitivity and change trend were analyzed.Finally,the Multi-Objective Genetic Algorithm(MOGA)was used to obtain the optimal solution of each variable,and the results were verified.The results showed that the optimized blade mass was re-duced by 14.7％,the maximum reduction of the maximum stress at each azimuth was 7.8％,and the maximum reduction of the maximum deformation was 16.7％.The research results can provide a reference for the structural optimization design of blades un-der combined loads.
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