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

Table 8

The first 4 damping ratios of cantilever cylindrical shell coated with and without hard coating under different excitation levels.

Modal order	No coating state (%)	0.5 g level; (%)	Effect degree; (%)	1 g level; (%)	Effect degree; (%)	2 g level; (%)	Effect degree; (%)	4 g level; (%)	Effect degree (%)	6 g level; (%)	Effect degree (%)
1	0.26	0.55	111.5	0.51	96.2	0.50	92.3	0.39	50.0	0.38	46.2
2	0.17	0.48	182.4	0.48	182.4	0.43	152.9	0.39	129.4	0.36	111.8
3	0.25	0.47	88.0	0.26	4.0	0.24	−4.0	0.31	24.0	0.34	36.0
4	0.21	0.18	−14.3	0.27	28.6	0.30	42.9	0.37	76.2	0.40	90.5