engleski

Investigation of linear springing of large container ships

Recent increase of the container sea trade and building of Ultra Large Container Ships (ULCS) are pointed out. Design and construction of such huge ships with large deck openings and high speed are at the margin of Classification Rules. EU FP7 project Tools for Ultra Large Container Ships for development of the integrated design tools, based on numerical procedures, model tests and full scale measurements, is described. Special attention is paid to structural model based on the advanced beam theory. It includes shear influence on bending and torsion, contribution of bulkheads to hull stiffness as well as an appropriate modeling of relatively short engine room structure of ULCS. Along with that, hydrodynamic and hydrostatic models are presented in condensed form. Theoretical contributions are illustrated within the numerical example which includes complete hydroelastic analysis of 7800 TEU container ship. In this case, validation of 1D FEM model is checked by correlation analysis with the vibration response of the fine 3D FEM model. The procedure related to determination of engine room effective stiffness is checked by 3D FEM analysis of ship-like pontoon which has been made according to the considered ship characteristics. The obtained results confirm that the sophisticated beam model is very useful numerical tool for the designer and represents a reasonable choice for determining wave load effects on ULCS, in preliminary design stage. In addition, overview and basic conclusions of the related International Workshop on Springing and Whipping of Ships, organized in the middle of the project as a milestone, is given.

Linear springing; Hydroelasticity; Beam model; FEM; Container ship

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