For the self-synchronous vibration phenomenon in the process of the single-point fatigue loading test of wind turbine blade, the mathematical model of the single-point fatigue loading system based on LaGrange equation was established and the influence factors of the self-synchronous vibration phenomenon were obtained. Applying the phase plane method, the vibration system is converted into an autonomous system. Then the vibration system’s simulation model was built with Matlab/Simulink and the basic law of the self-synchronous vibration phenomenon in different initial phase was obtained. At last, a set of single-point fatigue loading test equipment which was used to test the accuracy of the mathematical model and simulation model was set up. The experimental results shows that under the premise of load source rotary drive frequency the same as the blade’s natural frequency, the self-synchronous vibration phenomenon occurs when the initial phase difference is less than and in this state, the amplitude of blade is the largest and constant; when the initial phase difference is , the self-synchronous vibration phenomenon is weak, and the amplitude of the blade gradually stabilizes at a low value after a period of time; when the initial phase difference is , the self-synchronous vibration phenomenon do not occur and the amplitude of blade is disorder. The above conclusion provide theoretical basis for the control algorithm of fatigue loading test.
Key words
Wind turbine blade /
Fatigue loading /
Vibration self-synchronous /
Loading /
testing
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