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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

Balchen,  J. G., Jenssen,  N. A., Mathisen,  E., and Sælid,  S., 1980, “A Dynamic Positioning System Based on Kalman Filtering and Optimal Control,” Modeling, Identification and Control, 1(3), pp. 135–163.
Chen, Q., 2001. “Analysis and Control of Riser Angles,” Master’s Thesis, Dept. of Marine Structures, Faculty of Marine Technology, NTNU, Trondheim, Norway.
Engseth, A., Bech, A., and Larsen, C., 1988, “Efficient Method for Analysis of Flexible Risers,” BOSS’88, Behaviour of Offshore Structures, Trondheim, Norway.
Fossen, T. I., 1994, Guidance and Control of Ocean Vehicles, John Wiley and Sons, Chichester, UK.
Imakita, A., Tanaka, S., Amitani, Y. and Takagawa, S., 2000, “Intelligent Riser Angle Control DPS,” Proc. of ETCE/OMAE2000 Joint Conf., OMAE2000/OSU OFT-30001, New Orleans, LA, Paper No. 1323, S+R (CD-Rom).
Leira, B. J., 1998, “On-line Control Algorithm Based on Reliability Methods,” Proc. OMAE, Lisbon, Portugal, Paper No. 3001, OFT (CD-Rom).
Leira, B. J., Sørensen, A. J., Strand, J. P., and Larsen, C. M., 2001, “A Reliability-Based On-line Dynamic Positioning Control Algorithm,” ICOSSAR 2001, Newport Beach, CA.
Sørensen,  A. J., Sagatun,  S. I., and Fossen,  T. I., 1996, “Design of a Dynamic Positioning System Using Model-Based Control,” J. Control Eng. Practice, 4(3), pp. 359–368.
Sørensen, A. J., Leira, B, Strand, J. P., and Larsen, C. M., 2000, “Modelling and Control of Riser Angles and Stresses in Dynamic Positioning,” Proc. of 5th IFAC Conf. on Manoeuvring and Control of Marine Craft-MCMC’2000, Aalborg, Denmark pp. 275–280.
Sørensen,  A. J., and Strand,  J. P., 2000, “Positioning of Small-Waterplane-Area Marine Constructions with Roll and Pitch Damping,” J. Control Eng. Practice, 8(2), pp. 205–213.

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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