Fan pitch bearings often break and affect power production. In order to monitor the internal state of pitch bearings

CIVA is used to simulate the phased array ultrasonic testing process of pitch bearings

and explore the phased array ultrasonic testing process and defects measurement methods suitable for pitch bearings. CIVA simulation is carried out against the defect characteristics of the inner tooth pitch bearing. The results show that

using the method that scans the area from the bolt hole to the root of the tooth by the shear wave oblique probe

and the area from the bolt hole to the bearing seal ring by the combination of the longitudinal wave straight probe and the shear wave oblique probe can achieve full coverage of the detection area of the pitch bearing. Moreover

combined with the detection method obtained from the simulation

the measurement method of the defect is deeply explored. When the defect height does not exceed 3 mm

the-6 dB method can be used to measure the defect

and when the defect height exceeds 3 mm

the end point diffraction method is the best to measure. Through the simulation technology

a suitable detection method and defect judgment technology are provided for the phased array ultrasonic detection of cracks in the pitch bearing of wind turbines.