Abstract
This paper provides a discussion of the technical and theoretical ambiguities, requirements, and limitations to develop a practical implementation of the IMO Second Generation Intact Stability criteria. This discussion is the result of industry collaboration, where two implementations of the guidelines were developed jointly, albeit independently. Both implementations were then used to assess four sample cases: C11 container ship, KRISO container ship (KCS), barge, and fishing vessel, for which the detailed particulars and results are given. Conclusions on the practicalities of use, a comparison of the results, and suggestions on how the criteria might be integrated into a workflow are also given.
Highlights
A consistent set of criteria to assess the dynamic stability of ships, which are considered at risk of encountering critical stability situations in waves, has garnered considerable international interest in recent years
The guidelines address the vulnerability of a vessel by dividing the dynamic response into five failure modes: dead ship condition (DS), excessive acceleration (EA), pure loss of stability in waves (PL), parametric roll (PR), and surf-riding/broaching (SB), where each mode is further evaluated at different levels of complexity
The level 1 and level 2 criteria discussed in Section 2 are implemented as two independent codes: one at the American Bureau of Shipping, the “ABS Code”, and one at Creative
Summary
A consistent set of criteria to assess the dynamic stability of ships, which are considered at risk of encountering critical stability situations in waves, has garnered considerable international interest in recent years. Such criteria present several technical challenges, most obviously because the dynamics of concern are nonlinear and computationally demanding, and yet the resulting criteria must remain practical and consistent. Of particular interest is the consistency and practicality of the methods in use, as well as details related to implementation, which remains an open question
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