Vibration Measurement of a Metal Sheet Using Single-Camera Digital Image Correlation with Projection Components

Table 1

The first four natural frequencies and damping ratios of the proposed DIC method, EMA, and FEA results.

	Single-camera DIC		EMA		FEA	Frequency difference between DIC and EMA (%)	Frequency difference between DIC and FEA (%)
	fn (Hz)	ζ (%)	fn (Hz)	ζ (%)	fn (Hz)
1^st mode	28.83	1.09	28.52	0.51	28.94	1.09	0.38
2^nd mode	99.81	0.83	96.26	0.91	97.52	3.69	2.35
3^rd mode	180.49	0.33	178.94	0.33	179.87	0.87	0.34
4^th mode	331.34	0.33	327.23	0.04	328.99	1.26	0.71