International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Global hydroelastic analysis of ultra large container ships by improved beam structural model

  • Senjanovic, Ivo (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture) ;
  • Vladimir, Nikola (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture) ;
  • Tomic, Marko (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture) ;
  • Hadzic, Neven (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture) ;
  • Malenica, Sime (Bureau Veritas, Research Department)
  • Published : 2014.12.31
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Abstract

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

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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