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QUADRATIC RESPONSE TO SHORT-CRESTED SEAS

The motivation for the work described was that, in contrast to the situation for linear seakeeping phenomena, there appeared to be no theory for the estimation of common statistical parameters for quadratic nonlinear seakeeping systems subjected to short crested random seas. The quadratic input-output model in use for some time was taken directly from electronics and communication theory where the notion of short crestedness does not exist, and is thus a "time only" (long crested sea) model. Hasselmann published the basic formulation for a short crested sea model in 1966, and the present development is largely a translation and embellishment of this basic formulation. In this case the linear and quadratic response functions that define the ship dynamics become functions of vectors rather than scalars. Given a directional wave spectrum and the linear and quadratic response functions corresponding to some response of interest, estimating formula have been developed for a variety of statistics. It was found that the previous restriction of the time-only case to the encounter frequency domain may be largely removed. The formula for the mean value of the response in short crested seas is especially simple, in that it is found to be hardly more computationally demanding than estimating the variance of a purely linear system in short crested seas.

  • Supplemental Notes:
    • Conference paper
  • Authors:
    • Dalzell, J F
  • Conference:
  • Publication Date: 0

Media Info

  • Features: References;
  • Pagination: 11p., incl. discuss.

Subject/Index Terms

Filing Info

  • Accession Number: 00657870
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM