The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary

Table 11

Damping ratios of TCS under BLB with different looseness levels.

Modal; order	No looseness; (Hz)	25%; looseness; (Hz)	Effect degree; (%)	50% looseness; (Hz)	Effect degree; (%)	75% looseness; (Hz)	Effect degree; (%)
1	0.20	0.12		0.16		0.18
2	0.76	0.37		0.17		0.53
3	1.14	1.02		0.51		1.03
4	0.27	0.36		0.33		0.72
5	0.74	0.85		0.84		0.88
6	0.37	0.24		0.25		0.95
7	0.39	0.3		0.19		0.17
8	0.30	0.13		0.15		0.17