Identifying the Mechanical Parameters of Hard Coating with Strain Dependent Characteristic by an Inverse Method

Table 5

The first 6 orders natural frequencies and modal damping ratios of uncoated and coated plate obtained by hammering method.

Order		1	2	3	4	5	6
Uncoated plate	Natural frequency (Hz)	73.62	189.51	441.03	715.13	754.21	1297.88
	Modal damping ratio (%)	0.37	0.19	0.22	0.29	0.15	0.11
Coated plate	Natural frequency (Hz)	71.05	190.05	432.12	708.13	768.44	1263.13
	Modal damping ratio (%)	0.57	0.24	0.24	0.43	0.45	0.25