ON NONLINEAR ROLLING OF SHIPS IN RANDOM SEAS

An analytical method has been developed to obtain an approximate solution to the nonlinear rolling equation of a ship sailing in random waves. The stability of the stationary solution is then investigated by examining the behavior of the solution to the equation of the first variation of the equation of motion. Results of calculations made for a model of an American Challenger class cargo ship indicate large departures from the linear solution, especially near resonance. These results also indicate that the model may have unstable motion in quartering seas. Although the instability can be eliminated by considering a nonlinear damping form, the motion is still expected to be violent near these headings.

• Corporate Authors:

  University of California, Berkeley

  Institute of Transportation Studies Library
  Berkeley, CA  United States  94720
• Authors:
  • Haddara, M R
• Publication Date: 1971

Media Info

• Pagination: 41 p.

Subject/Index Terms

• TRT Terms: Damping (Engineering); Moments (Mechanics); Rolling; Ship motion; Waves
• Old TRIS Terms: Irregular waves; Roll damping; Rolling moment
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00040920
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Tech. Rpt.
• Contract Numbers: DOT-CG-84549-A
• Files: TRIS
• Created Date: Feb 14 1973 12:00AM