KGmax Curves Associated With Second Generation Intact Stability Criteria for Different Types of Ships

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, w...

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Bibliographic Details
Published in:Journal of marine science and application 2016, Vol.15 (3), p.223-235
Main Authors: Grinnaert, Francois, Billard, Jean-Yves, Laurens, Jean-Marc
Format: Article
Language:English
Subjects:
Computation
Container ships
Containers
Electrical Machines and Networks
Engineering
Engineering Sciences
Failure modes
Geotechnical Engineering & Applied Earth Sciences
Machinery and Machine Elements
Mechanics
Methods
Offshore Engineering
Organizations
Power Electronics
Safety margins
Ships
Stability
Stability analysis
Stability criteria
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Summary: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 KGma~ 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 KGm~x 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 （Rpk0） for a fixed ship＇s loading condition.
ISSN:1671-9433
1993-5048
DOI:10.1007/s11804-016-1369-3