Crack Detection of Fan Blade Based on Natural Frequencies

Table 3

Second natural frequency ratio () as a function of crack location and crack size for the blade.

	0.7305	0.7401	0.7621	0.7842	0.8039	0.8093	0.8138	0.8195
	0.5801	0.6220	0.6671	0.7223	0.7627	0.7899	0.8124	0.8173
	0.3918	0.4851	0.5662	0.6358	0.7214	0.7731	0.8088	0.8142