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Numéro : 2181 - Year : 1992

Multiple criteria selection of the best possible ITU series of fishing vessel for stability, seakeeping and powering targets

G. TRINCAS, Institut d'Architecture Navale. Université de Trieste
R. NABERGOJ, Institut d'Architecture Navale. Université de Trieste
A. ALKAN, Université Technique d'Istamboul

During the last decade insight has been given to usefulness of ranking seakeeping qualities of ships according to extensions of Bales’ criterion. So far, the evaluation of the best vessel within a family and the definition of the so-called optimum vessel, i.e. the one having the maximum merit index, have been performed on the basis of mathematical models only capable of producing seakeeping ranks of known design alternatives. But when the target is to generate the best possible vessel by combining more significant characteristics such as powering, seakeeping and stability, the designer must simultaneously consider different goals and multiplecriteria" Thus, it follows that an evaluation framework is necessary during preliminary design to support the evaluation of the best possible vessel within the complex and conflicting decision-making process such as the assessment of hydrodynamic of fishing vessels.

Imposing targets on vessels in a proper way leaves room also to designer’s heuristic preferences as regards multiple attributes. Preference orderings are assured to rank hydrodynamic achievements of fishing vessels through the fixed number of multiple attributes they possess. The vessels appear as vectors in the attribute space, calling for the value maximizing solution to assist the designer in selecting that attribute combination which may be considered the best possible at ship's preliminary design stage.

The mathematical model for multiple criteria selection of fishing vessels was developed basing it on analytical, numerical and statistical formulations of powering, seakeeping and stability performance prediction of Istanbul Technical University (ITU) Methodical Series. It is included in the general decision procedure flow as a stand-alone module- A computer based procedure is then exploited for ranking a given set of vessels with multiple attribute or scores, allowing the designer to change attribute weights of importance, targets, constraints, and so forth, up to the definition of the best possible vessel and trade off analysis.