ANALYTICAL DETERMINATION OF SHIP MOTIONS AND MOORING FORCES

Describes a computer program which calculates the three translatory motions-heave, surge and sway-and the three rotary motions-roll, pitch and yaw-of a ship, represented by a rectangular block, moored in regular waves of given height and period approaching from an arbitrary direction. Accelerations, velocities and displacements and the forces in up to 30 non-linear mooring lines or breasting dolphins are printed out at successive small time intervals during passage of the waves, using first order linear wave theory and the Froude-Krylov hypothesis. The six degrees of freedom of the floating rigid body are represented by a system of six equations of motion which take into account all the forces acting on the body at a given instant, including hydrodynamic forces, forces in the moorings and external forces due to tornado, wind or current. A solution for the simultaneous accelerations in the six degrees of freedom is obtained by Newmark's "beta" method, from which velocities, displacements and mooring forces follow directly.

  • 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  USA  45206
  • Authors:
    • Bomze, H
  • Conference:
  • Publication Date: 1974-5

Media Info

  • Features: References;
  • Pagination: p. 429-443
  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00072934
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: OTC # 2072
  • Files: TRIS
  • Created Date: May 1 1975 12:00AM