Wind turbine blades load matching method under biaxial fatigue test

: In order to improve the fatigue test accuracy and efficiency of full-scale structure of wind turbine blades, an effective load matching method for full-scale structure fatigue test of wind turbine blades under biaxial loading is proposed. The blade biaxial loading fatigue test scheme is designed. The transfer matrix method is used to calculate the test bending moment under biaxial loading. The particle swarm optimization algorithm is designed to optimize the position and mass of the excitation device in the flap-wise and edgewise directions and the position, mass and quantity of the fixed counterweight. Based on this, the calculation model of the test bending moment and the data of the target bending moment are integrated into the particle swarm optimization algorithm to achieve the optimal matching of the biaxial loading fatigue test load, Finally, a numerical example is given to verify it. The results show that this method can make the test load closer to the target load, further accelerate the popularization of biaxial loading fatigue test, and provide a certain theoretical reference and application value for engineering practice.