ANCHOR-LAST DEPLOYMENT PROCEDURE FOR MOORING

The anchor-last mooring procedure is investigated in order to determine the transient forces in the mooring line and the velocities of the anchor. Transient forces were determined and the results showed that no severe snap loads occurred for the cases investigated. In addition, it was found that the vertical velocity of the anchor can be small as it approaches impact with the floor of the ocean. Both extensible (nylon and dacron) and inextensible (steel wire rope) lines were investigated. Lumped mass numerical models were developed for both cases. For the extensible line case the equations of motion were determined for each mass from Newton's Second Law, and they were integrated using a second order predictor-corrector integration technique. Hamiltonian techniques were used to determine the equations of motion for the inextensible line. The predictions from the numerical models show the line tensions and positions as a function of time. (Author)

• Corporate Authors:

  Oregon State University, Corvallis

  Department of Oceanography
  Corvallis, OR  United States  97331
• Authors:
  • Thresher, R W
  • Nath, J H
• Publication Date: 1973-6

Media Info

• Pagination: 98 p.

Subject/Index Terms

• TRT Terms: Anchoring; Anchors (Mooring devices); Cables; Computer programs; Deployment; Equations of motion; Force; Loads; Mathematical models; Mooring buoys; Mooring cables; Moorings; Nylon; Steel; Tensile properties; Tension; Wire rope
• Identifier Terms: National Sea Grant Program
• Old TRIS Terms: Anchor forces; Cables mechanical; Dacron; Force mechanics; Loading mechanics; Sea grant program
• Subject Areas: Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 00050831
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Ref 73-5 Res Rpt
• Contract Numbers: N00014-67-A-0369-000
• Files: TRIS
• Created Date: Jan 31 1974 12:00AM