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

Table 6

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

Modal order	No coating state; (Hz)	0.5 g level; (Hz)	Effect degree; (%)	1 g level; (Hz)	Effect degree; (%)	2 g level; (Hz)	Effect degree; (%)	4 g level; (Hz)	Effect degree; (%)	6 g level; (Hz)	Effect degree (%)
1	898.5	893.0	−0.6	892.0	−0.7	892.0	−0.7	891.5	−0.8	891.5	−0.8
2	970.5	951.5	−2.0	950.5	−2.1	950.0	−2.1	949.0	−2.2	947.5	−2.4
3	1045.0	1037.0	−0.8	1036.0	−0.9	1034.5	−1.1	1033.0	−1.2	1032.0	−1.3
4	1152.5	1144.5	−0.7	1144.0	−0.7	1142.5	−0.9	1138.0	−1.3	1135.0	−1.5