SEMI FOR ALL SEASONS

A new conceptual design for a semi-submersible that offers dynamic platform control in all six degrees of freedom as well as a doubling of remobilization speed is presented. The six degree of freedom control will enable non-moored station keeping and yaw orientation as well as the practical elimination of sea-induced heave, roll and pitch motions. These advantages accrue from two major departures from conventional semi-submersible design; the platform support columns are streamlined and tapered, and the submerged hulls are more submarine shaped and equipped with fore and aft "wrap-around" propellers whose blades are collectively as well as cyclically changeable in pitch. Submarine model experimental data are presented in addition to an extrapolation of Naval Research and Development Center (NSRDC) model data for a 300' x 300' platform presenting speed vs power and stability predictions.

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

  Offshore Technology Conference

  6200 North Central Expressway
  Dallas, TX  United States  45206
• Authors:
  • Haselton, F R
• 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. 895-904
• Serial:
  • Volume: 1

Subject/Index Terms

• TRT Terms: Dynamic positioning; Offshore platforms; Semisubmersibles; Stability (Mechanics); Stabilized platforms
• Old TRIS Terms: Offshore platform stability
• Subject Areas: Bridges and other structures; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00072908
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: OTC #2030 Paper
• Files: TRIS
• Created Date: Jan 16 1975 12:00AM