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

Table 7

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

Modal order	No coating state; (Hz)	1 g level; (Hz)	Effect degree; (%)	2 g level; (Hz)	Effect degree; (%)	4 g level; (Hz)	Effect degree; (%)	8 g level; (Hz)	Effect degree (%)	12 g level; (Hz)	Effect degree (%)
5	1292.0	1289.5	−0.2	1289.5	−0.2	1289.0	−0.2	1288.5	−0.3	1287.5	−0.3
6	1309.5	1307.0	−0.2	1306.0	−0.3	1306.0	−0.3	1306.0	−0.3	1305.5	−0.3
7	1606.5	1604.5	−0.1	1604.5	−0.1	1604.0	−0.2	1603.0	−0.2	1602.0	−0.3
8	1990.0	1988.0	−0.1	1988.0	−0.1	1987.5	−0.1	1987.0	−0.2	1986.5	−0.2