## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 2American Society of Mechanical Engineers, 2001 - Arctic regions |

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Page 388

X - and Y - components of upper ( left ) and lower ( right ) riser angle as functions

of vessel offset for a 3D current profile with direction of velocity vector rotated by

180 degrees from top to bottom , Chen ( 2001 ) Figure 4 .

X - and Y - components of upper ( left ) and lower ( right ) riser angle as functions

of vessel offset for a 3D current profile with direction of velocity vector rotated by

180 degrees from top to bottom , Chen ( 2001 ) Figure 4 .

**Dynamic**response of ...Page 389

angle in degrees ( left ) and

to the right , Chen ( 2001 ) Angle DAF for Lower angle Figure 5 .

**Dynamic**response of riser top angle to low - frequency vessel motion . Responseangle in degrees ( left ) and

**dynamic**amplification factor ( max**dynamic**/ static )to the right , Chen ( 2001 ) Angle DAF for Lower angle Figure 5 .

**Dynamic**...Page 396

A comparison of time series show that

motion and quasi - static tension , as the amplitude of line motions , and the

resulting

...

A comparison of time series show that

**dynamic**tension is out of phase with topmotion and quasi - static tension , as the amplitude of line motions , and the

resulting

**dynamic**tension are controlled by drag forces along the line . However...

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acceptable analysis applied approach assessment associated assumed calculated coefficient combined components considered corresponding corrosion cost crack criteria damage defined dependent depth determined developed direction distribution dynamic effect element Engineering environmental equation estimate evaluated event example expressed extreme factor failure fatigue Figure force frequency function fuzzy given important increase initial inspection International limit load loss maintenance maximum mean measured Mechanics method motion normal obtained offshore operational parameters peak performed period pipe pipeline platform possible predicted present probability probability of failure procedure production random range relative reliability represents response return period riser risk safety ship shown shows simulation spectral spectrum statistical storm strength stress structure surface Table theory typical ultimate uncertainties variables wave height wind