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  United States  45206
• Authors:
  • Bomze, H
• 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. 429-443
• Serial:
  • Volume: 2

Subject/Index Terms

• TRT Terms: Dynamic loads; Floating structures; Mooring; Ship motion
• Uncontrolled Terms: Floating bodies
• Old TRIS Terms: Moored vessels
• Subject Areas: Bridges and other structures; Marine Transportation; Vehicles and Equipment;

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