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Comparison of DP Performance Prediction Techniques for Scaled Models

[+] Author Affiliations
Stephen P. Very, Dan L. Walker

Oceanic Consulting Corporation, St. John’s, NL, Canada

James P. Millan

National Research Council-Institute for Ocean Technology, St. John’s, NL, Canada

D. Bruce Colbourne

Memorial University of Newfoundland, St. John’s, NL, Canada

Paper No. OMAE2012-84069, pp. 745-753; 9 pages
doi:10.1115/OMAE2012-84069
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4488-5
  • Copyright © 2012 by ASME

abstract

Utilization of Dynamic Positioning (DP) systems for offshore exploration and production of hydrocarbons is increasing due to the need to exploit deeper water depths, where mooring becomes less feasible. In conducting analysis or predictions for DP System performance, there are two common techniques used: Either an experimental investigation at reduced scale using a simplified mooring system without thrusters; or, a similarly scaled experiment using active DP thrusters. This paper identifies differences in the DP system performance estimates for each method by assessing the same system in identical wind–wave environments. Experiments were completed using a 1:40 scale model of a typical 99,000t monohull drillship equipped with an active DP system consisting of six azimuthing thrusters. These experiments were repeated with the vessel unpowered on two mooring systems with different stiffnesses. A comparison of system performance predictions provided by each method is presented.

Copyright © 2012 by ASME

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