Online Structural Health Monitoring of Rotating Machinery via Ultrasonic Guided Waves

Table 4

Amplitudes of L(0,4) and L(0,6) without and with crack when the rotor rotates at 15Hz.

kPa	Without crack		With crack
	L(0,4)	L(0,6)	L(0,4)	L(0,6)
1	6.943	22.93	7.024	22.97
2	6.841	22.90	6.152	21.12
3	6.766	22.89	6.891	23.19
4	6.803	22.76	6.515	21.22