Analysis Of Dynamic Response Characteristics On Large-scale Wind Turbine Blade Based On HHT Method

An accurate understanding about the aeroelastic stability of wind turbine has great significance for safe operation of wind turbine. With the help of GH BLADED software, as professional wind turbine computation software package,and MATLAB software, as a large-scale mathematical software,from the perspective of the blade stiffness and external wind conditions,what is the change of attack angle and the different of turbulent characteristics,this paper studied the influence about the blade stiffness and external wind conditions to dynamic response of the wind turbine blades in the frequency domain.Taking5MW offshore wind turbine published by National Renewable Energy Laboratory(NREL) as a research object,it established a computational model in GH BLADED software.Meanwhile, modal calculation was conducted for the established model to verify reliability and accuracy of the model.In the case about the change of the blade stiffness,the change of attack angle and the three-dimensional turbulent wind models on different turbulent characteristics,this paper simulated the600s blade tip deflection deformation in the normal operation.With the help of MATLAB software,this paper made programming and debugging program of FFT,wavelet packet transform and the HHT method.Taking the600s blade tip deflection deformation of different stiffness as a research object,using three different calculating methods,it analyzed the results and compared the results through different frequency-domain methods in the frequency domain.This paper took the simulated600s blade tip deflection deformation from two angles about attack (or three-dimensional turbulent wind direction,yaw) and turbulence (turbulent fluctuation velocity) as a research object. Based on the MATLAB software,using three different calculating methods,it analyzed the results and compared the results using different frequency-domain methods in the frequency domain.Through the research of this paper,it deepened the understanding of the aeroelastic stability of wind turbine.Through the computation using the frequency domain methods,it studied the influence of blade stiffness and wind conditions to dynamic response characteristics of wind turbine in the frequency domain.