Multi objective optimization of the wind turbine tower doorframe based on response surface
                     MENG Ling rui, HE Hai jian, YANG Yang, ZHU Yun long, CHAO Guan liang, DONG Shu yan
                                 (Xuchang XJ Group Wind Power Technology Company, Xuchang 461000, China)

Abstract: Aiming at the large equivalent stress under extreme condition and high manufacturing costs problem of a wind turbine tower doorframe, for example, the bottom tower with doorframe finite element parametric model was built in ANSYS Workbench. A response surface model was built by using the central composite experimental design method (CCD),the influence of the doorframe size change on its equivalent stress was studied through the analysis. Meanwhile, the initial population of optimized samples was extracted by Shifted Hammersley method and the multi objective optimization of the doorframe was carried out by genetic algorithm based on the response surface analysis results. The results indicate that the maximum equivalent stress of the doorframe decreased by 26.69% and the mass reduced by 73.82% after optimization.

Key words: wind turbine tower doorframe; design variables; response surface; sensitivity analysis; multiobjective optimization