Calculation of wind turbine blade stiffness based on equivalent stiffness method optimization
Wind turbine blade stiffness due to the characteristics of nonlinear and big section of variations,for modeling the initial stiffness assessment questions usually adopt stiffness elements distribution.This article is based on the equivalent stiffness method of variable stiffness of beam deflection,the leaves reduced to equivalent variable cross-section cantilever beam,according to the characters of blade selection reasonable boundary conditions.Based on the cross section data characteristics of blade modeling,optimization of the original the calculation of equivalent stiffness method,make the method more joint blade model,which applies to blades,to achieve optimization.The use of ANSYS finite element software for blade of prestressed simulation experiment,draw a blade deflection simulation numerical to the simulation calculation of the deflection value for reference,to demonstrate the effectiveness of the optimized method.Results show that the optimized equivalent stiffness method to get the stiffness value,under the uniformly distributed load at a low value of 22.5 Pa deflection of theoretical calculation value and experimental value of deflection error of 9.68%,reduces the error of the original method to calculate and close to the blad model,can be used in the blade stiffness estimation,provides a new method for blade stiffness calculation.