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Analytical modelling of ship bottom grounding considering combined surge and heave motions
https://orcid.org/0000-0002-6642-0054
Abstract This paper provides a new contribution to the analytical treatment of ship grounding accidents. New formulations are proposed to assess the resisting force of outer/inner bottom plating and transverse floors when the vessel undergoes combined surge and heave motions during the grounding event. Considering shallow and sharp rocks described by parabolic functions, analytical solutions are derived from plastic limit analysis and validated by comparison to non-linear finite element simulations. A failure criterion is also proposed to trigger the rupture of the bottom plating and all the derived closed-form expressions are implemented into an in-house solver. The solver is then coupled to a 6-DOFs external dynamics program, which allows to account for the action of the surrounding water. Resulting tool is first validated on a full scale cruise ship by comparison to finite element results. It appears than although some discrepancies arise, especially in the response of transverse floors after rupture, the bottom damage distribution seems to be well predicted. Finally, the developed tool is used to quickly predict the grounding response of different types of ships and the influence of their mass and hydrodynamic properties on the damage extent is investigated.
Highlights Expressions for ship grounding under combined surge and heave motions are proposed. A simplified tool is proposed for ship grounding. The tool is validated by comparisons to Ls Dyna calculations for grounding accidents. Parametric analysis is performed on different ships.
Analytical modelling of ship bottom grounding considering combined surge and heave motions
https://orcid.org/0000-0002-6642-0054
Abstract This paper provides a new contribution to the analytical treatment of ship grounding accidents. New formulations are proposed to assess the resisting force of outer/inner bottom plating and transverse floors when the vessel undergoes combined surge and heave motions during the grounding event. Considering shallow and sharp rocks described by parabolic functions, analytical solutions are derived from plastic limit analysis and validated by comparison to non-linear finite element simulations. A failure criterion is also proposed to trigger the rupture of the bottom plating and all the derived closed-form expressions are implemented into an in-house solver. The solver is then coupled to a 6-DOFs external dynamics program, which allows to account for the action of the surrounding water. Resulting tool is first validated on a full scale cruise ship by comparison to finite element results. It appears than although some discrepancies arise, especially in the response of transverse floors after rupture, the bottom damage distribution seems to be well predicted. Finally, the developed tool is used to quickly predict the grounding response of different types of ships and the influence of their mass and hydrodynamic properties on the damage extent is investigated.
Highlights Expressions for ship grounding under combined surge and heave motions are proposed. A simplified tool is proposed for ship grounding. The tool is validated by comparisons to Ls Dyna calculations for grounding accidents. Parametric analysis is performed on different ships.
Analytical modelling of ship bottom grounding considering combined surge and heave motions
https://orcid.org/0000-0002-6642-0054
Abstract This paper provides a new contribution to the analytical treatment of ship grounding accidents. New formulations are proposed to assess the resisting force of outer/inner bottom plating and transverse floors when the vessel undergoes combined surge and heave motions during the grounding event. Considering shallow and sharp rocks described by parabolic functions, analytical solutions are derived from plastic limit analysis and validated by comparison to non-linear finite element simulations. A failure criterion is also proposed to trigger the rupture of the bottom plating and all the derived closed-form expressions are implemented into an in-house solver. The solver is then coupled to a 6-DOFs external dynamics program, which allows to account for the action of the surrounding water. Resulting tool is first validated on a full scale cruise ship by comparison to finite element results. It appears than although some discrepancies arise, especially in the response of transverse floors after rupture, the bottom damage distribution seems to be well predicted. Finally, the developed tool is used to quickly predict the grounding response of different types of ships and the influence of their mass and hydrodynamic properties on the damage extent is investigated.
Highlights Expressions for ship grounding under combined surge and heave motions are proposed. A simplified tool is proposed for ship grounding. The tool is validated by comparisons to Ls Dyna calculations for grounding accidents. Parametric analysis is performed on different ships.
Analytical modelling of ship bottom grounding considering combined surge and heave motions
Pineau, Jean-Philippe (Autor:in) / Le Sourne, Hervé (Autor:in)
Marine Structures ; 88
05.12.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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