Crack Detection of Fan Blade Based on Natural Frequencies

Table 5

Experimental results of the blade.

Crack location	Crack depth	Experimental result (Hz)			Theoretical result (Hz)			Relative error (%)
		0	0	4.511	28.300	78.891	4.870	30.410	85.442	0.21	2.23	2.56
60	60	4.592	28.132	79.213	4.538	29.803	80.502	0.59	5.04	2.00
190	60	4.773	28.074	78.855	4.739	29.527	81.902	3.10	4.72	3.28
310	60	4.824	29.244	79.946	4.842	29.040	80.488	1.43	3.33	2.03
440	60	3.769	27.016	69.262	4.869	30.293	82.781	0.92	3.46	3.42
60	90	4.326	27.996	77.232	4.180	29.342	71.981	9.83	7.93	3.40
190	90	4.685	27.847	71.048	4.568	28.621	77.839	5.30	2.18	0.78
310	90	4.725	29.903	73.001	4.780	27.380	71.218	1.99	1.71	0.24
440	90	4.511	28.300	78.891	4.792	29.944	72.963	1.40	0.14	0.05
125	80	4.260	29.672	78.068	4.477	29.508	79.332	4.85	0.56	1.59