engleski

Ship hydroelastic analysis with sophisticated beam model and consistent restoring stiffness

This paper deals with the methodology of hydroelastic analysis, based on mathematical model, which includes structural, hydrostatic and hydrodynamic submodels. The modal superposition method is used, and ship natural modes are determined by the sophisticated beam model based on the advanced thin-walled girder theory, which takes shear influence on torsion into account as novelty, as well as the stiffness contribution of transverse bulkheads in quite a reliable way. Moreover, the complete and consistent restoring stiffness, which satisfies the ship equilibrium, is derived. The mathematical model is checked by model test of a flexible barge. Application of the developed numerical procedure is illustrated in the case of a very large container ship. 1D FEM model is verified by correlating dry natural vibrations with those obtained by 3D FEM model.

containership; hydroelasticity; beam model; restoring stiffness; model test; FEM

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