ON A NONLINEAR STOCHASTIC WAVE THEORY AND MORISON'S FORMULA

This paper investigates the influence the use of a second order wave theory has on predictions based on Morson's formula. The sea is described by a second-order short crested stochastic wave theory for finite water depth. Various approximations to the nonlinear drag term in Morison's equation are compared using water particle velocities given by the second order wave theory. The inertia term in Morison's equation is linear in the water particle acceleration. To illustrate the influence of the non-Gaussian behaviour of the sea on this term, a fatigue analysis of an inertia-dominant monopod platform is carried out. It is assumed that the resulting non-Gaussian distribution of the stresses can be described with sufficient accuracy by its mean, variance, skewness and kurtosis.

• Supplemental Notes:
  • Proc. 8th Intnl. Conference Offshore Mechanics and Arctic Engn.(1989) p.45 [7 pp.]
• Authors:
  • Madsen, A H
  • Jensen, J J
• Publication Date: 1989

Language

• English

Subject/Index Terms

• TRT Terms: Mathematical models
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00696545
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM