An analysis is made of the heaving response of a number of different designs of semi-submersibles based on four basic geometries; twin circular hulls, twin rectangular hulls, multi-caisson designs with circular caissons and a spherical caisson design. Within each geometry a number of subsidiary effects have been examined, such as the number of columns on each hull, number of caissons, aspect ratios of rectangular hulls and orientation of the semi-submersible to the waves. The analysis does not attempt to give precise design values but to assess the order of merit of the various designs for heaving response. It is shown, inter alia, that for multi-hull designs, circular section hulls will always have a better response than rectangular section hulls. Multicaisson designs have a better heaving performance than multi-hull designs, except at the higher frequencies, and large diameter caissons have a poorer performance than deep caissons of the same volume. Spherical caissons have a lower level of heave exciting force than other designs but due to a higher natural frequency, their heave response is not much improved. Order from BSRA as No. 49,922.

  • Supplemental Notes:
    • Paper presented at Spring Meeting of R.I.N.A., London, April 8, 1976.
  • Corporate Authors:

    Royal Institution of Naval Architects, England

    10 Upper Belgrave Street
    London SW1X 8BQ,   England 
  • Authors:
    • Oo, K M
    • Miller, N S
  • Publication Date: 1976

Media Info

  • Features: References;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00194317
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Paper No. 7
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM