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, 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 (R PR0) for a fixed ship’s loading condition.
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Availability:
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Supplemental Notes:
- Copyright © 2016, Harbin Engineering University and Springer-Verlag Berlin Heidelberg. The contents of this paper reflect the views of the author[s] and do not necessarily reflect the official views or policies of the Transportation Research Board or the National Academy of Sciences.
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Authors:
- Grinnaert, Francois
- Billard, Jean-Yves
- Laurens, Jean-Marc
- Publication Date: 2016-9
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 223-235
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Serial:
- Journal of Marine Science and Application
- Volume: 15
- Issue Number: 3
- Publisher: Harbin Engineering University
- ISSN: 1671-9433
- EISSN: 1993-5048
- Serial URL: http://link.springer.com/journal/11804
Subject/Index Terms
- TRT Terms: Containerships; Maritime safety; Motion; Rolling; Ships; Stability criteria
- Subject Areas: Marine Transportation; Operations and Traffic Management; Safety and Human Factors;
Filing Info
- Accession Number: 01611040
- Record Type: Publication
- Files: TRIS
- Created Date: Sep 21 2016 2:44PM