ANALYSIS AND RESEARCH ON PENDULUM FATIGUE LOADING CHARACTERISTICS OF WIND TURBINE BLADES
To investigate the impact of relevant parameters of a rotating eccentric mass exciter on blade vibration characteristics during fatigue loading,as well as to further reveal the variation law of exciter current in actual test,a dynamic model of the rotating eccentric mass fatigue test system is established based on the Lagrange kinetic equation.The dynamic parameters of the rotating eccentric mass exciter and its interaction with the blade are analyzed.The results indicate that the rotating eccentric mass in the exciter will change the modal frequency of the blade fatigue loading system.Based on the actual phase difference between the rotating eccentric mass and the blade vibration in the real loading data,the theoretical model is modified.The current peak predicted by the improved theoretical model has an error of 8.5% relative to the actual current.
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