NONLINEAR MOTIONS OF FAST SHIPS AND THE EFFECT ON OPERABILITY

In the design practice of today, frequent use is made of optimisation techniques based on operability analysis. Given a known set of operational criteria with respect to motion amplitudes, velocities and accelerations and a statistical description of the environmental circumstances the "downtime" of the vessel under consideration may be calculated. This involves a large number of motions calculations for which generally spoken linear theories are being used, being it 2-D striptheory methods or 3-D diffraction methods. For fast monohulls this may yield to eronous results, because the motions and in particular the vertical accelerations tend to become strongly nonlinear with increasing forward speed and relative motion amplitude. A comparison between an operability analysis of a design variation using both linear and nonlinear motion calculation methods is shown.

• Supplemental Notes:
  • Hydrodynamics: Computations, Model Tests and Reality; MARIN Workshops on: Advanced Vessels Station Keeping, Propulsor-Hull Interaction and Nautical Simulators; 11-14 May 1992; Wageningen, The Netherlands. Pubs by Elsevier Sc. Pubs. Procs. Workshop A, p 87 [7 p, 8 ref, 7 fig]
• Authors:
  • Keuning, J A
• Publication Date: 1992

Language

• English

Subject/Index Terms

• TRT Terms: Mathematical models; Ship motion
• Uncontrolled Terms: High speed vessels
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00704508
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM