Anchor-Last Deployment Procedure for Mooring

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1973
Accession Number
AD0763442

Entities

People

  • John H. Nath
  • Robert W. Thresher

Organizations

  • Oregon State University

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Catenaries
  • Coefficients
  • Computer Programs
  • Computers
  • Coordinate Systems
  • Curvature
  • Deep Water
  • Deployment
  • Engineering
  • Equations
  • Equations Of Motion
  • Mechanical Engineering
  • Military Research
  • Pressure Distribution
  • Shape
  • Standards
  • United States

Readers

  • Electrical Engineering
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • ballistics.