An expert system for ship s transversal frame synthesis. / Síntese racional automatizada de cavernas de embarcações.

AUTOR(ES)

Ademar de Azevedo Cardoso

DATA DE PUBLICAÇÃO

1994

RESUMO

This work presents the basic principles used in the development of an expert system for ship s transversal frame synthesis. A slice of the ship which contains the transversal frame is taken out from the remaining structure and modelled as a two-dimensional shape. The interaction of the transversal frame with the longitudinal structure is done considering the longitudinal stiffeners as elastic supports for the slice. The interaction with the shell plating is represented by a shear stress distribuition along the transverse frame. Based on this assumption, it is possible to get boundary conditions for the two-dimensional model similar to those associated with a three-dimensional model. The developed system, named TRANSEC, accept as input data the transverse section molded line, discretized by beam elements ; the load due to the lateral pressure and a beam cross section table from where the system chooses which one is suitable for each discrete piece of the beam. The suitable or optimum beam cross section will be the one with less weigh and which results in structural loads according to previouly adopted admissible stress levels. The system contains three units: one of Finite Element, that does structural calculus; one Graphic Module for the model s drawings and one Manager Module, aiming to provide a user friendly communication, besides controling the two other modules. The program was applied on two structures synthesis that were optimized by three-dimesional Finite Element models. The obtained results are similar for both procedures, but with a significant difference: the time spent on using the expert system, few hours, is much less than the days spent on using three-dimensinal models. The TRANSEC system can be considered a powerful tool , mainly in the initial phase of ship transverse structural design.

ASSUNTO(S)

síntese estrutural estrutura transversal expert system elementos finitos transverse frame of ships finite element analysis racional synthesis sistema especialista

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