Online Structural Health Monitoring of Rotating Machinery via Ultrasonic Guided Waves

Figure 13

Collected signals of piezoelectric transducers after filtering (a) no. 1, (b) no. 2, (c) no. 3, and (d) no. 4 when the cracked rotor rotates at 15Hz.

(a)

(b)

(c)

(d)