Bo Qin, Xiaofeng Geng, Yongjian Li, and Kexiang Wei.Crack Detection of Wind Turbine Blades using Vibro-Acoustic modulation.Dynamic Systems and Applications 29 (2020) No. 6, 2251 – 2263

https://doi.org/10.46719/dsa20202966

ABSTRACT.

The present study demonstrated the application of the vibro-acoustic modulation technique for crack detection in wind turbine blades. Firstly, the principle of vibro-acoustic modulation for crack detection is simply explained. Secondly, an experiment setup is established to investigate the nonlinear response characteristics of crack blades subjected to a high-frequency acoustic wave with low-frequency vibration excitation. Lastly, the effects of the crack sizes and locations on the nonlinear response amplitudes are demonstrated and evaluated. The results demonstrated that the crack damage produce sidebands around the fundamental ultrasonic component in the power spectra from the nonlinear modulation responses, and the amplitude of the sidebands was related to the size and position of the crack damage.

Keywords: Nonlinear modulation; Fatigue crack; Wind turbine blade; Non-destructive testing; Crack detection.