Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 14American Society of Mechanical Engineers, 1995 - Arctic regions |
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Page 204
... Heave [ ft ] 1.0 0.5 0.0 -0.5 -1.0 100 200 300 400 500 Time [ sec ] 5 Spec . [ ft2 / Hz ] 3 Heave TLP Model Coherency 2 0- 0.00 0.05 0.10 0.15 0.20 0.25 Frequency [ Hz ] 1.0 0.5- 0.0 0.00 0.05 0.10 0.15 0.20 0.25 Frequency [ Hz ] 0.30 ...
... Heave [ ft ] 1.0 0.5 0.0 -0.5 -1.0 100 200 300 400 500 Time [ sec ] 5 Spec . [ ft2 / Hz ] 3 Heave TLP Model Coherency 2 0- 0.00 0.05 0.10 0.15 0.20 0.25 Frequency [ Hz ] 1.0 0.5- 0.0 0.00 0.05 0.10 0.15 0.20 0.25 Frequency [ Hz ] 0.30 ...
Page 227
... heave motion follows the water surface very well . For the high frequency case ( Figure 5b ) , since the variations in buoy draft are relatively high , the heave motions do not perfectly follow the water surface , which are clear at the ...
... heave motion follows the water surface very well . For the high frequency case ( Figure 5b ) , since the variations in buoy draft are relatively high , the heave motions do not perfectly follow the water surface , which are clear at the ...
Page 229
... heave motion ( dotted line ) . As wave frequency decreases , the peak of the lift - off shifts to the left of the heave peak . At about f = 0.16 Hz ( Figure 9b ) , the amplitude of the lift - off variation becomes much smaller and shows ...
... heave motion ( dotted line ) . As wave frequency decreases , the peak of the lift - off shifts to the left of the heave peak . At about f = 0.16 Hz ( Figure 9b ) , the amplitude of the lift - off variation becomes much smaller and shows ...
Contents
DESIGN OF OFFSHORE STRUCTURES | 1 |
Aarsnes | 11 |
A Novel Design Procedure for Jacket Installations | 19 |
Copyright | |
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acceptance criteria added mass ALARP amplitude analysis angle Axial load barge behaviour bending buckling buoy calculated Campos Basin catastrophe sets coefficients collision compliant tower components computed configuration crack crane crane vessel cycles cyclic cylinder damping damping ratio Designer Wave diameter displacement drilling dynamic effects element equation fatigue flexjoint function global heave horizontal hydrodynamic installation ISSC TLP jacket joint lift lift forces linear load kN maximum measured mesh mode model test mooring line motion natural frequency nonlinear obtained Ocean Ocean Ranger Offshore Technology operation oscillation panel parameters platform predicted Quickwave ratio response riser risk shear simulation specimen SSCV Statoil steel stiffness strain stress surge tanker tension tension leg platform transverse tube tubular USFOS values velocity vertical vessel vibration vortex induced vibrations vortex shedding water depth wave forces wave height wave period weight weld toe wellhead wind windspeed