KGmax curves associated with second generation intact stability criteria for different types of ships
TypeArticles dans des revues avec comité de lecture
Currently, second generation intact stability criteria are being developed and evaluated by the International Maritime Organization (IMO). In this paper, we briefly present levels 1 and 2 assessment methods for the criteria of pure loss of stability and parametric roll failure modes. Subsequently, we show the KGmax curves associated with these criteria. We compute these curves for five different types of ships and compare them with the curves embodied in the current regulations. The results show that the safety margin ensured by the first level-1 method of calculation for both pure loss of stability and parametric roll seems to be excessive in many cases. They also show that the KGmax given by the second level-1 method and by the level-2 method may be very similar. In some cases, the level-2 method can be more conservative than the second level-1 method, which is unanticipated by the future regulation. The KGmax curves associated with parametric roll confirm that the C11 container ship is vulnerable to this failure mode. The computation of the second check coefficient of parametric roll level 2 (C2) for all possible values of KG reveals the existence of both authorized and restricted areas on the surface formed by both the draft and KG, which may replace the classical KGmax curves. In consequence, it is not sufficient to check that C2 is lower than the maximum authorized value (RPR0) for a fixed ship’s loading condition.
Showing items related by title, author, creator and subject.
PHOEMSAPTHAWEE, Surasak; LE BOULLUEC, Marc; LAURENS, Jean-Marc; DENISET, François (Springer, 2013)Underwater gliders are recent innovative types of autonomous underwater vehicles (AUVs) used in ocean exploration and observation. They adjust their buoyancy to dive and to return to the ocean surface. During the change ...
PHOEMSAPTHAWEE, Surasak; LEROUX, Jean-Baptiste; LAURENS, Jean-Marc; DENISET, François (Taylor & Francis, 2008)FRANCAIS Un module de cavitation à poche a été développé et implémenté sur un code potentiel hélice. La méthode pour représenter la cavitation à poche utilise les vitesses de transpiration qui permettent de dévier la ...
Les Dardanelles ou la fin de l’illusion des prédreadnoughts : l’apport de la modélisation informatique BILLARD, Jean-Yves; GRINNAERT, François; DELUMEAU, Isabelle (Presses de l'université Paris-Sorbonne, 2015)Le naufrage du Bouvet par sa brutalité a suscité de nombreuses questions. Une étude historique permettant de comprendre les causes amont et un travail de modélisation informatique de plusieurs navires de l'époque permettent ...
Experimental study of bubble sweep-down in wave and current circulating tank: Part I—Experimental set-up and observed phenomena DELACROIX, Sylvain; GERMAIN, Gregory; GAURIER, Benoit; BILLARD, Jean-Yves (ELSEVIER, 2016)Bubble sweep-down is a significant issue for the oceanographic vessels, which affect the acoustic sur- veys. Experimental trials, carried out in the Ifremerwave and current circulating tank on a 1/30 model of the Pourquoi ...
Experimental study of bubble sweep-down in wave and current circulating tank: Part II—Bubble clouds characterization DELACROIX, Sylvain; GERMAIN, Gregory; GAURIER, Benoit; BILLARD, Jean-Yves (ELSEVIER, 2016)In this second part, images acquired from the specific trials developed in order to study the phenomenon of bubble sweep-down are analysed. A post-processing method has been developed to analyse the two air entrainment ...