Cargo Transfer at Sea - The Pendulation of Loads Suspended from Shipboard Cranes

Abstract

A theory has been developed which could aid Navy materials handling specialists in their effort to evaluate load transfer systems for a modular port facility. The theory predicts the horizontal response of an unrestrained, wire suspended load in regular and random seas. The line length is allowed to vary with time, hence the resulting load response in random seas is characterized as a non-stationary random process. The analysis is used to predict the motion of a load freely suspended from the boom of a Navy 100-ton floating crane. The results from the analysis and from full scale tests at sea confirm the fact that motion of unrestrained loads is a serious problem in even moderate sea states. Taglines or other means of restraint will be required from inception through completion of each load transfer.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1972
Accession Number
AD0754747

Entities

People

  • Duane A. Davis
  • Harry S. Zwibel

Organizations

  • Naval Facilities Engineering Service Center

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • California
  • Cargo Handling
  • Civil Engineering
  • Containerships
  • Frequency
  • Materials Handling
  • Mathematical Analysis
  • Oscillation
  • Platforms
  • Random Variables
  • Relative Motion
  • Ship Motion
  • Shipboard
  • Simulations
  • Stochastic Processes
  • Unloading

Readers

  • Brain and Cognitive Science; Experimental Psychology; Cognitive Neuroscience
  • Coastal Oceanography
  • Naval Architecture and Marine Engineering.