The Dynamic Loading Approach (DLA) in ship design practice uses explicitly determined loads derived from a rational methodology as the basis for structural analysis. An important component of the DLA established by the American Bureau of Shipping (ABS) is the concept of an equivalent regular wave, whereby one transforms from frequency and probability domain analysis to an instantaneous realisation in the time domain suitable for global finite element structural analysis. In this paper an alternative approach to the equivalent regular wave is presented. This alternative, called the equivalent irregular wave, is based on a finite Fourier sum approximating the classical Fourier-Stieljes integral representation of a zero mean, second-order stationary, Gaussian random process. The application of the DLA methodology to the special case of a SWATH (Small Waterplane Area Twin Hull) vessel is described. For this case, the instantaneous load components determined from the equivalent irregular wave are compared with those determined from the equivalent regular wave. An efficient method based on the use of generalised modes for determining the critical loads on the SWATH hulls is also presented.


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    Title :

    Hydrodynamic loads on SWATH hulls


    Additional title:

    Hydrodynamische Belastungen von Katamaranen mit kleiner Rumpf-Wasserebene (SWATH)


    Contributors:


    Publication date :

    1998


    Size :

    18 Seiten, 9 Bilder, 3 Tabellen, 16 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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