Mode Selection Model for Rail Crack Detection Based on Ultrasonic Guided Waves

Table 7

Simulated group velocity and crack location.

Mode no.	Vg0 (m/s)	Vg1 (m/s)	Group velocity error (m/s)	Crack location (m)	Location error (m)	Amplitude (mm)
1	3076.0	3062.8	13.2	1.74	0.01	0.0178
7	3148.2	3119.5	28.7	—	—	0
11	2866.7	2848.5	18.2	1.70	0.03	0.0099

Note: “—“ means undetected.