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TECHNICAL PAPERS

Modeling of Riser Response for DP Control

[+] Author and Article Information
Bernt J. Leira, Qiaofeng Chen, Asgeir J. Sørensen, Carl M. Larsen

NTNU, Faculty of Marine Technology, N-7491 Trondheim, Norway

J. Offshore Mech. Arct. Eng 124(4), 219-225 (Oct 22, 2002) (7 pages) doi:10.1115/1.1491274 History: Received July 01, 2001; Revised October 01, 2001; Online October 22, 2002
Copyright © 2002 by ASME
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References

Figures

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General view of the floater-riser system
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Top (left) and bottom (right) riser angle as functions of profile (From Chen 2)
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X- and Y-components of upper (left) and lower (right) riser angle as functions of vessel offset for a 3-D current profile with direction of velocity vector rotated by 180 deg from top to bottom 2
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Dynamic response of riser top angle to low-frequency vessel motion: Response angle in degrees (left) and dynamic amplification factor (max dynamic/static) (right) 2
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Dynamic response of riser top angle to low-frequency vessel motion: Response angle in degrees (left) and dynamic amplification factor (max dynamic/static) (right) 2
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Surface current velocity as a function of time
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Reliability indices as functions of time for fixed set-point above well-head
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Reliability indices as functions of time for varying set-point applying reliability-based weighting factors

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