A dynamic-positioning (DP) system can be designed to stabilize and damp the motions of a vessel when moored as well as unmoored. A design process is described whereby the DP controller parameters and their functionalizations are derived from smooth stable response through the operating regime of the moored vessel. Field results from a North Sea operating drillship are compared with predicted results, and the problems that were encountered are discussed. An augmentation scheme is presented by which the DP system will automatically back up and reinforce the holding capability of the mooring system under varying weather conditions and yet remain quiescent in calm weather.

  • Supplemental Notes:
    • Presented at the 6th Annual Offshore Technology Conference, Houston, Texas, May 6-8, 1974. Requests for this document should be directed to David L. Riley.
  • Corporate Authors:

    Offshore Technology Conference

    6200 North Central Expressway
    Dallas, TX  United States  45206
  • Authors:
    • Sargent, J S
    • Morgan, M J
  • Conference:
  • Publication Date: 1974-5

Media Info

  • Features: References;
  • Pagination: p. 319-333
  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00072920
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: OTC #2064
  • Files: TRIS
  • Created Date: Jan 16 1975 12:00AM