Research Article
The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary
Table 10
Natural frequencies 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 | 906.3 | 904.6 | | 887.8 | | 806.7 | | 2 | 980.8 | 978.2 | | 915.4 | | 848.8 | | 3 | 1025.7 | 1011.1 | | 980.1 | | 951.5 | | 4 | 1072.3 | 1062.3 | | 1072.0 | | 1010.7 | | 5 | 1274.0 | 1267.0 | | 1268.3 | | 1279.1 | | 6 | 1312.8 | 1309.3 | | 1310.6 | | 1319.6 | | 7 | 1613.8 | 1613.3 | | 1612.4 | | 1608.8 | | 8 | 1996.3 | 1992.4 | | 1990.8 | | 1987.9 | |
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