Experimental Study on the Influence on Vibration Characteristics of Thin Cylindrical Shell with Hard Coating under Cantilever Boundary Condition

Table 9

The 5th to 8th damping ratios of cantilever cylindrical shell coated with and without hard coating under different excitation levels.

Modal order	No coating state (%)	1 g level; (%)	Effect degree; (%)	2 g level; (%)	Effect degree; (%)	4 g level; (%)	Effect degree; (%)	8 g level; (%)	Effect degree (%)	12 g level; (%)	Effect degree (%)
5	0.23	0.35	52.2	0.27	17.4	0.25	8.7	0.22	−4.3	0.17	−26.1
6	0.34	0.36	5.9	0.38	11.8	0.39	14.7	0.41	20.6	0.45	32.4
7	0.19	0.22	15.8	0.19	0	0.16	−15.8	0.19	0	0.15	−21.1
8	0.30	0.34	13.3	0.33	10.0	0.30	0	0.19	−36.7	0.20	−33.3