By C Guedes Soares; Joško Parunov
Read or Download Advanced ship design for pollution prevention : proceedings of the International Workshop "Advanced Ship Design for Pollution Prevention", Split, Croatia, 23-24 November 2009 PDF
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Extra resources for Advanced ship design for pollution prevention : proceedings of the International Workshop "Advanced Ship Design for Pollution Prevention", Split, Croatia, 23-24 November 2009
The so build equivalent full FE model has the same mass and inertia properties as a full FE model. The FE model wetted part is used for the integration of the pressures. In order to build the equivalent full FE model wetted part from the partial model wetted part, the missing fore and aft part are taken from the hydro model. To achieve this, the hydro model is cut at the fore and aft sections of the three cargo hold FE model. The fore and aft parts of the hydro model are then added to the partial FE model wetted part.
5DOF (Bulian et al. 2003), 3DOF (Neves & Rodríguez 2007) and 6DOF models (Ribeiro e Silva et al. 2005). will be explained individually in order to provide a clear description of the different effects. Consider the static case of a ship in calm water. Any disturbance in the transverse direction (as from a wind gust) will lead to roll motions dominated by the “natural roll period”. 1), both ends of the ship emerge at the troughs of the waves. Righting levers at both ends of the ship are smaller, with a minimum when the crest is approximately amidships, since the waterplane at the immersed portions of the bow and stern are narrower than in calm water.
In contrast to the above, if a ship is located in a wave trough (Fig. 2), the flared parts of the bow and stern are more deeply immersed than in calm water, making the instantaneous waterplane wider than in calm water with the result that the metacentric height (GM) is increased over the calm water value, subsequently leading to the condition of improving or increasing stability. In pure longitudinal seas condition, the first order roll wave excitation is zero. However, the ship may experience a very small roll disturbance from some external or internal cause.