AUGMENTATION OF A MOORING SYSTEM THROUGH DYNAMIC POSITIONING

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:
  • Presented at the 6th Offshore Technology Conference
  • Location: Houston Texas
  • Date: 1974-5-6 to 1974-5-8
• Publication Date: 1974-5

Media Info

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

Subject/Index Terms

• TRT Terms: Dynamic positioning; Mechanical stability; Mooring; Moorings; Offshore platforms
• Old TRIS Terms: Moored vessels; Offshore platform stability
• Subject Areas: Bridges and other structures; Marine Transportation; Vehicles and Equipment;

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