Zhu Chunling

Numerical and experimental study on icingdetection of wind turbine blade based on ultrasonic guided wave

The numerical and experimental study on ultrasonic icing detection method based on guided wave is carried out on the surface of aluminum plate. Two piezoelectric elements are bonded to the surface of the aluminum plate, one works as a generator and the other works as a receiver, which are coupling with the ice and the aluminum plate to establish the numerical simulation model. Propagation characteristics of Lamb wave excited by the generator are calculated using numerical simulation method. Analysis of characteristic parameters of lamb wave in different frequency conditions is carried out to obtain the relationship between ice and ultrasonic wave propagation characteristics. The ultrasonic icing detection test platform is established and ultrasonic signals in the conditions of ice with different length and thickness are monitored, which are compared with that in in a clean plate of waveform. Analysis of effects of icing parameters on the guided wave propagation time and peak waveform was investigated. The results show that the peak time of ultrasonic guided wave propagation is delayed, and with the increase of the ice thickness and length, the peak time of ultrasonic guided wave propagation increases linearly.