To address the problem of damage identification of wind turbine tower flange bolts
this paper proposes a detection method of bolt fracture damage identification using vibration signal response
and establishes a damage identification index based on the absolute rate of change of vibration response energy based on the damage identification theory of frequency response function. Taking a 1.5 MW wind turbine as the research object
the strain
displacement and acceleration signals are compared and analyzed by numerical simulation
and the identification effect of the index under different damage conditions is obtained. The results show that the absolute rate of change of vibration energy based on strain response shows higher sensitivity and accuracy in identifying the bolt fracture damage compared with the displacement and acceleration response signals
and the energy damage indicator based on strain response shows a significant change at the bolt fracture damage site
which can accurately identify the bolt fracture damage location of the tower section flange of the wind turbine.
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