Abstract
Modelling of seakeeping qualities of open-top container carriers in the preliminary design phaseIn this paper are presented problems of modelling seakeeping qualities of open-top container carriers in the preliminary design phase. Approximations of accelerations and occurrence rate of green water ingress to holds are presented in function of main ship design and wave parameters. The approximations have been elaborated by applying theory of artificial neural networks in the wide range of ship hull dimensions and forms, while ship motion and wave parameters have been limited to real operational conditions described by means of the so called operational scenario. Such approach has made it possible to reach high accuracy of approximation and simple structure of mathematical model simulatneously.
Highlights
In the work [4] a systematization of transport ships has been proposed from the point of view of their seakeeping qualities
Set of to-be-explained variables, which comprised: – occurrence rates of green water ingress to holds, – significant amplitudes of transverse and vertical accelerations occurring in holds
The elaborated approximations of seakeeping qualities of open-top containerships may be used in the preliminary design phase for:
Summary
In the work [4] a systematization of transport ships has been proposed from the point of view of their seakeeping qualities. Its physical cause was an incorrect value of initial metacentric height that led to accelerations whose resultants generated large mass inertia forces Another formal problem associated with lack of hatch covers was non-fulfilment of the requirements resulting from International Convention on Loadlines, which deal with construction of freeboard deck. Formal requirements for the designing of open-top containerships impose the necessity of performing ship model tests aimed at determining amount of water flooding holds without hatch covers. To perform such tests is not possible in the parametric design phase but only in that design phase when dimensions of ship hull and its general form are already konwn. Informal design guidelines are limited first of all to the tests dealing with green water entering the deck of a given ship and do not find any application in the parametric design phase of open-top containership
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