Research Article
An Analytical Method for Jack-Up Riser’s Fatigue Life Estimation
Table 2
The data of the wave force spectrum calculation (
m).
| Sequence number | Wave frequency | Wavenumber | | | Wave force spectrum under finite water depth | Wave force spectrum under infinite water depth |
| 1 | 0.05 | 0.0016 | 0.0252 | 3.9328 | 0.0000 | 0.0000 | 2 | 0.10 | 0.0032 | 0.0958 | 3.7437 | 0.0000 | 0.0000 | 3 | 0.15 | 0.0050 | 0.2136 | 3.4259 | 0.0000 | 0.0000 | 4 | 0.20 | 0.0069 | 0.3576 | 3.0320 | 0.0000 | 0.0000 | 5 | 0.25 | 0.0089 | 0.5061 | 2.6177 | 1.23 × 1011 | 1.01 × 1011 | 6 | 0.30 | 0.0113 | 0.6578 | 2.1811 | 3.48 × 1012 | 3.11 × 1012 | 7 | 0.35 | 0.0141 | 0.7876 | 1.7886 | 1.04 × 1013 | 9.87 × 1012 | 8 | 0.40 | 0.0174 | 0.8840 | 1.4753 | 1.34 × 1013 | 1.32 × 1013 | 9 | 0.45 | 0.0213 | 0.9451 | 1.2552 | 1.22 × 1013 | 1.21 × 1013 | 10 | 0.50 | 0.0258 | 0.9773 | 1.1220 | 9.49 × 1012 | 9.46 × 1012 | 11 | 0.55 | 0.0310 | 0.9919 | 1.0510 | 6.95 × 1012 | 6.95 × 1012 | 12 | 0.60 | 0.0368 | 0.9975 | 1.0188 | 4.98 × 1012 | 4.98 × 1012 | 13 | 0.65 | 0.0431 | 0.9993 | 1.0062 | 3.57 × 1012 | 3.57 × 1012 | 14 | 0.70 | 0.0500 | 0.9998 | 1.0018 | 2.57 × 1012 | 2.57 × 1012 | 15 | 0.75 | 0.0574 | 1.0000 | 1.0005 | 1.88 × 1012 | 1.88 × 1012 | 16 | 0.80 | 0.0653 | 1.0000 | 1.0001 | 1.39 × 1012 | 1.39 × 1012 | 17 | 0.85 | 0.0737 | 1.0000 | 1.0000 | 1.05 × 1012 | 1.05 × 1012 | 18 | 0.90 | 0.0827 | 1.0000 | 1.0000 | 7.96 × 1011 | 7.96 × 1011 | 19 | 0.95 | 0.0921 | 1.0000 | 1.0000 | 6.13 × 1011 | 6.13 × 1011 | 20 | 1.00 | 0.1020 | 1.0000 | 1.0000 | 4.77 × 1011 | 4.77 × 1011 | 21 | 1.05 | 0.1125 | 1.0000 | 1.0000 | 3.76 × 1011 | 3.76 × 1011 | 22 | 1.10 | 0.1235 | 1.0000 | 1.0000 | 2.99 × 1011 | 2.99 × 1011 | 23 | 1.15 | 0.1349 | 1.0000 | 1.0000 | 2.41 × 1011 | 2.41 × 1011 | 24 | 1.20 | 0.1469 | 1.0000 | 1.0000 | 1.95 × 1011 | 1.95 × 1011 | 25 | 1.25 | 0.1594 | 1.0000 | 1.0000 | 1.59 × 1011 | 1.59 × 1011 | 26 | 1.30 | 0.1724 | 1.0000 | 1.0000 | 1.31 × 1011 | 1.31 × 1011 | 27 | 1.35 | 0.1860 | 1.0000 | 1.0000 | 1.09 × 1011 | 1.09 × 1011 | 28 | 1.40 | 0.2000 | 1.0000 | 1.0000 | 9.09 × 1010 | 9.08 × 1010 | 29 | 1.45 | 0.2145 | 1.0000 | 1.0000 | 7.63 × 1010 | 7.63 × 1010 | 30 | 1.50 | 0.2296 | 1.0000 | 1.0000 | 6.45 × 1010 | 6.45 × 1010 | 31 | 1.55 | 0.2452 | 1.0000 | 1.0000 | 5.47 × 1010 | 5.48 × 1010 | 32 | 1.60 | 0.2612 | 1.0000 | 1.0000 | 4.67 × 1010 | 4.68 × 1010 |
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