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

Table 2

Modal orthogonal factor W₂.

Frequency (Hz)	Mode no.	W2
40,000	7	0.99998
50,000	7	0.99996
60,000	7	0.99996
60,000	3	0.99958
50,000	3	0.99871
30,000	5	0.99853
40,000	15	0.99784
40,000	23	0.99709
40,000	3	0.99635
60,000	14	0.99598
50,000	28	0.99018
60,000	6	0.98995
50,000	14	0.98925
40,000	24	0.98903
30,000	3	0.98838
50,000	6	0.98312
20,000	4	0.98042
30,000	16	0.97753
60,000	34	0.97562
60,000	19	0.97243