SOME OBSERVATIONS ON THE TECHNIQUES FOR PREDICTING THE OSCILLATIONS OF FREELY-FLOATING HULLS IN A SEAWAY

The problem is stated as follows: Given a seaway defined by its variance spectrum and a hull whose dynamical properties are nonlinear and frequency dependent, what techniques are available for finding statistical expression for the oscillatory motions in each of the six degrees of freedom. The nonlinearities appearing in the hydrodynamic coefficients are either the consequence of changes in hull geometry resulting from the oscillatory displacements from the mean position, or they are the manifestation of the nonlinear phenomenon of viscous damping. It is brought out that, although numerical solution can be obtained in the time domain, no generally applicable nonnumerical technique for solving nonlinear differential equation either deterministic or stochastic is in hand, and that one is forced to have recourse to approximative techniques. Some available such techniques are discussed as to their usefulness in solving the second order set of stochastic differential equations expressing hull response in a random seaway.

  • Supplemental Notes:
    • Presented at the 6th Annual Offshore Technology Conference, Houston, Texas, May 6-8, 1974. Requests for this document should be directed to David L. Riley.
  • Corporate Authors:

    Offshore Technology Conference

    6200 North Central Expressway
    Dallas, TX  USA  45206
  • Authors:
    • St Denis, M
  • Conference:
  • Publication Date: 1974-5

Media Info

  • Features: References;
  • Pagination: p. 823-840
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00072919
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: OTC #2024
  • Files: TRIS
  • Created Date: Jan 16 1975 12:00AM