Research Article
The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary
Table 2
Natural frequencies of TCS under BLB with different looseness numbers.
| Modal
order | No looseness
(Hz) | Loosen
1 bolt
(Hz) | Difference I
(%) | Loosen
2 bolts
(Hz) | Difference II
(%) | Loosen
3 bolts
(Hz) | Difference III
(%) | Loosen
4 bolts
(Hz) | Difference IV
(%) |
| | 1 | — | 786.2 | — | 678.0 | — | 591.9 | — | 554.4 | — | | 2 | 976.5 | 974.2 | | 935.0 | | 831.6 | | 758.9 | | | 3 | 1068.7 | 1065.0 | | 1043.2 | | 1035.4 | | 1013.0 | | | 4 | 1313.8 | 1298.5 | | 1248.4 | | 1193.3 | | 1146.8 | | | 5 | 1535.9 | 1461.0 | | 1310.0 | | 1275.1 | | 1269.0 | | | 6 | 1603.2 | 1597.6 | | 1629.0 | | 1591.1 | | 1403.4 | | | 7 | 1841.9 | 1743.4 | | 1681.1 | | 1655.8 | | 1588.3 | | | 8 | 2000.8 | 1995.6 | | 1991.7 | | 1988.0 | | 1984.9 | |
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