engleski

The Global Structural Response Model for Multi-deck Ships in Concept Design Phase

This paper is an attempt to contribute to the improvement of the analysis model within overall structural synthesis procedure. Paper is organized in two parts: modeling principles and model validation. Principles of the generic model formulation on the global and substructure levels are given in detail while the load model is briefly summarized. In the validation part of the paper the basic building blocks (macro-elements, gross-elements and surrogates) are presented and validated. Specially developed complex 8-node stiffened element (capable of replacing four ordinary 4-node macro-elements) is presented combining numerical and analytical approaches. Different surrogates (sets of elements and ordinary macro-elements) used for equivalent modeling of large side openings are evaluated, since reduced shear stiffness of superstructure sides has large influence on hull girder stress distributions over the entire cross section height. The generic ship models developed using outlined principles and the basic building blocks are further validated through complex examples of a large cruise ship and a livestock carrier. On the global level, the accuracy of the generic model with respect to the longitudinal stress distribution over ships height is compared with full ship FE model. Results confirmed that suggested structural modeling principles, based on generic FE models, gross-elements, macro-elements and surrogates, can be applied for the fast investigation of different structural topological/geometrical concepts as well as for the ordinary scantling/material optimization.

ship structural concept design; hull-superstructure interaction; multi deck ships; generic coarse mesh FE model; macro-elements; gross-elements; surrogates modeling; large side openings

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