THE DYNAMICS OF A SHIP MOORED BY A CABLE SYSTEM UNDER SEA STATE EXCITATION

A computer study of a moored Mariner Class ship in deep water shows that for a large ship, the mooring system has little influence on the motions at wave frequencies, which are essentially the same as those of the unrestrained ship. The drift forces, although relatively low in magntiude, result in large displacements of the ship since they occur at very low frequencies and must be absorbed by the restoring forces developed by the mooring sub-system. A study to determine the mooring line tension by first determining the static displacement of the ship due to the mean drift force and superimposing upon it the unstrained ship motions showed that increasing stiffness of the mooring subsystem results in less drifting of the ship from the mean position but higher oscillatory tensions in the mooring lines at wave frequencies.

• Corporate Authors:

  Catholic University of America

  620 Michigan Avenue, NE
  Washington, DC  United States  20064
• Authors:
  • Zarnick, E E
• Publication Date: 1972

Media Info

• Pagination: p. 143

Subject/Index Terms

• TRT Terms: Docking; Dynamic loads; Impact; Mooring; Offshore terminals; Petroleum; Petroleum terminals
• Old TRIS Terms: Berthing impact forces
• Subject Areas: Geotechnology; Marine Transportation; Operations and Traffic Management;

Filing Info

• Accession Number: 00056560
• Record Type: Publication
• Source Agency: American Petroleum Institute
• Report/Paper Numbers: PhD Thesis
• Files: TRIS
• Created Date: Jul 22 1974 12:00AM