Global hydroelastic analysis of ultra large container ships by improved beam structural model
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Some results on the hydroelasticity of ultra large container ships related to the beam structural modeland restoring stiffness achieved within EU FP7 Project TULCS are summarized. An advanced thin-walled girder theorybased on the modified Timoshenko beam theory for flexural vibrations with analogical extension to the torsionalproblem, is used for formulation of the beam finite element for analysis of coupled horizontal and torsional ship hullvibrations. Special attention is paid to the contribution of transverse bulkheads to the open hull stiffness, as well as tothe reduced stiffness of the relatively short engine room structure. In addition two definitions of the restoring stiffnessare considered: consistent one, which includes hydrostatic and gravity properties, and unified one with geometric stiffnessas structural contribution via calm water stress field. Both formulations are worked out by employing the finiteelement concept. Complete hydroelastic response of a ULCS is performed by coupling 1D structural model and 3Dhydrodynamic model as well as for 3D structural and 3D hydrodynamic model. Also, fatigue of structural elementsexposed to high stress concentration is considered.
Abstract
Some results on the hydroelasticity of ultra large container ships related to the beam structural modeland restoring stiffness achieved within EU FP7 Project TULCS are summarized. An advanced thin-walled girder theorybased on the modified Timoshenko beam theory for flexural vibrations with analogical extension to the torsionalproblem, is used for formulation of the beam finite element for analysis of coupled horizontal and torsional ship hullvibrations. Special attention is paid to the contribution of transverse bulkheads to the open hull stiffness, as well as tothe reduced stiffness of the relatively short engine room structure. In addition two definitions of the restoring stiffnessare considered: consistent one, which includes hydrostatic and gravity properties, and unified one with geometric stiffnessas structural contribution via calm water stress field. Both formulations are worked out by employing the finiteelement concept. Complete hydroelastic response of a ULCS is performed by coupling 1D structural model and 3Dhydrodynamic model as well as for 3D structural and 3D hydrodynamic model. Also, fatigue of structural elementsexposed to high stress concentration is considered.
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