Research Article
The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary
Table 4
Natural frequencies of TCS under BLB with different looseness levels.
| Modal
order | No looseness
(Hz) | 25%
looseness
(Hz) | Difference I
(%) | 75% looseness
(Hz) | Difference
II
(%) | 97.5% looseness
(Hz) | Difference
III
(%) |
| | 1 | — | 965.2 | — | 940.8 | — | 858.1 | — | | 2 | 976.5 | 973.2 | | 956.0 | | 898.6 | | | 3 | 1068.7 | 1067.4 | | 1056.0 | | 1035.4 | | | 4 | 1313.8 | 1312.9 | | 1308.9 | | 1293.1 | | | 5 | 1535.9 | 1530.7 | | 1504.3 | | 1382.8 | | | 6 | 1603.2 | 1602.8 | | 1601.5 | | 1594.9 | | | 7 | 1841.9 | 1835.4 | | 1802.5 | | 1650.2 | | | 8 | 2000.8 | 2000.5 | 0 | 1999.3 | | 1993.5 | |
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