Design And Application Of Layer Structure For Wind Turbine Blade Based On The Orthogonal Experiment Method

Wind turbine blade is the key to capturing wind energy components, its force condition is extremely complicated. The structural strength and stability of the blade plays a key role in guaranteeing the wind turbine generator working normally and stability. The lamination of composite fiber determines blade structural performance. So based on Orthogonal Experiment Method, the impact to of lay-up angle, lay-up sequence, lay-up percentage to turbine wind blade and coupling relationship of them were studied in this paper.Regarded a 1.5MW wind turbine blade as the research object, According to the actual condition of the maximum stress at the root of 0-2/3, a finite element model of 0~28.75 m segment was established. Bladed software was used to simulate the wind turbine blade load at an ultimate condition, the concentrated load and bending moment of each section for the blade were calculated.Regarded lay-up angle, lay-up sequence and 0° lay-up percentage as the test factor,based on arrangement of test, the Orthogonal Experiment table and mathematical model were established. Tsai-Wu failure factor and displacement were set as the object to treasure structural performance of blade. Each test of different level combined were simulated and the result were analyzed by Carding statistics. The result showed: The effect of the 0°lay-up on the stiffness and strength of the blade was greatest among three parameters, the effect of lay-up sequence on the blade stiffness was greater than the effect of lay-up angle, the effect of the lay-up angle on the blade strength was greater than the order of the layer. With the increasing of the layer angle, the strength of the blade was increased, and the stiffness was reduced. they were not consistent to the blade structure. Lay-up sequence on the blade strength and stiffness influence is inconsistent too. In different object, the optimal level were different. The coupling effect of the lay-up angle and the lay-up sequence has little effect on the structural performance of the blade, but the coupling effect of the layer sequence and 0°lay-up to the structural performance of the blade has great influence on the structure of the blade.Original lay-up structure was optimized. The simulation results showed the structural performance of the optimized blade were improved. Lay-up material was checked by Tsai-Wu tensor theory,and each ply material meets the strength requirements.