Research Article
Research on Vibration Fatigue Damage Locations of Offshore Oil and Gas Pipelines Based on the GA-Improved BP Neural Network
Table 2
Measured natural frequencies of the pipeline model (Hz).
| Modal order number | Model number | No. 1 | No. 2 | No. 3 | No. 4 |
| 1 | 11.694 | 11.719 | 11.209 | 10.668 | 2 | 14.089 | 14.063 | 13.281 | 14.063 | 3 | 20.411 | 20.313 | 20.099 | 19.531 | 4 | 29.892 | 29.521 | 27.368 | 29.363 | 5 | 36.045 | 35.938 | 31.269 | 35.938 | 6 | 39.111 | 38.281 | 36.169 | 37.632 | 7 | 40.715 | 40.625 | 40.625 | 40.625 | 8 | 61.765 | 61.719 | 61.417 | 60.536 | 9 | 72.592 | 71.809 | 71.012 | 72.026 | 10 | 90.633 | 90.493 | 90.510 | 90.308 |
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