COMPARISON BETWEEN SIMULATION RESULTS AND THEORETICAL PREDICTIONS FOR A SHIP ROLLING IN RANDOM BEAM WAVES

A simulation study has been undertaken of the rolling motion of a ship in random beam waves. For this purpose, it was assumed that a single degree of freedom equation of motion was appropriate, with nonlinearities in both the damping and restoring moment terms. By generating long realizations of a suitable random input process, and numerically integrating the equation of motion to obtain corresponding realizations of the roll response process, simulation estimates of the roll amplitude cumulative distribution, and the standard deviation of roll, were obtained. These estimates were compared with theoretical predictions for a realistic range of parameters. This paper proposes a modified theory that becomes progressively accurate as damping is increased. The theory shows excellent agreement with the simulation estimates.

• Supplemental Notes:
  • Report
• Corporate Authors:

  University of Sussex School of Engineering and Applied Sciences

  ,   England 

  NMI Ltd., Feltham

  Middlesex,   England 
• Authors:
  • Roberts, J B
• Publication Date: 1983-11

Media Info

• Features: References;
• Pagination: 54 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Forecasting; Rolling; Simulation
• Old TRIS Terms: Beam seas
• Subject Areas: Marine Transportation; Planning and Forecasting;

Filing Info

• Accession Number: 00661046
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Report/Paper Numbers: NMI-171
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM