Self-righting vessels, usually used for Search and Rescue (SAR) missions, are characterized by specific stability performance enabling the vessel to regain the upright condition, after possible capsizing due to heavy sea conditions. This requires a demanding design process aimed to provide the proper combination of centre of gravity position and geometry features; these last in turn are requested also to fulfil the significant high-speed performance, usually characterizing the SAR vessel operational profile. The resulting hull shape may be an interesting investigation case to be analysed in terms of stability in waves performance. The Second Generation Intact Stability criteria, recently finalized at IMO, provide a robust reference to derive physical modelling and criteria to carry out a stability assessment in this perspective. The paper considers two application cases relevant to real cases of selfrighting vessels for maritime safety and protection, with dimensions positioning the vessels in the medium-high size range, with reference to the category, together with a speed of more than 18 knots. Stability failures are going to be investigated with a specific focus on Broaching and Loss of stability in waves; some specific parameters will be selected to put in evidence their influence on the vessel stability in wave behaviour.
A Stability in Waves Assessment of SelfRighting Vessels
V. Ruggiero;
2025-01-01
Abstract
Self-righting vessels, usually used for Search and Rescue (SAR) missions, are characterized by specific stability performance enabling the vessel to regain the upright condition, after possible capsizing due to heavy sea conditions. This requires a demanding design process aimed to provide the proper combination of centre of gravity position and geometry features; these last in turn are requested also to fulfil the significant high-speed performance, usually characterizing the SAR vessel operational profile. The resulting hull shape may be an interesting investigation case to be analysed in terms of stability in waves performance. The Second Generation Intact Stability criteria, recently finalized at IMO, provide a robust reference to derive physical modelling and criteria to carry out a stability assessment in this perspective. The paper considers two application cases relevant to real cases of selfrighting vessels for maritime safety and protection, with dimensions positioning the vessels in the medium-high size range, with reference to the category, together with a speed of more than 18 knots. Stability failures are going to be investigated with a specific focus on Broaching and Loss of stability in waves; some specific parameters will be selected to put in evidence their influence on the vessel stability in wave behaviour.Pubblicazioni consigliate
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