scholarly journals An energy analysis of parametric roll for application to the second generation intact stability criteria

2017 ◽  
Vol 22 (3) ◽  
pp. 587-600
Author(s):  
François Grinnaert ◽  
Jean-Yves Billard ◽  
Jean-Marc Laurens
Keyword(s):  
Second Generation ◽  
Energy Analysis ◽  
Stability Criteria ◽  
Parametric Roll ◽  
Intact Stability

Influence of Systematic Hull Shape Variations on Ship Stability Performances in Waves

2020 ◽  
pp. 1-14
Author(s):  
Nicola Petacco ◽  
Giuliano Vernengo ◽  
Diego Villa ◽  
Antonio Coppedé ◽  
Paola Gualeni
Keyword(s):  
Second Generation ◽  
Design Space ◽  
Failure Modes ◽  
Free Form ◽  
Stability Criteria ◽  
Ship Stability ◽  
Parametric Roll ◽  
Modern Approach ◽  
Intact Stability ◽  
Geometric Variation

The sensitivity of ship stability performance in waves to geometric variation has been investigated by means of a simulation-based design framework. The study was devoted to assess the influence of hull geometry variations on some stability failure modes, namely, parametric roll (PR) and pure loss of stability (PLS). The application has been developed by using a representative model of a postpanamax container vessel. PR and PLS phenomena have been investigated by the application of second-generation intact stability criteria (SGISc). The initial multidimensional design space has been filled by 500 design configurations identified by means of a design of experiments approach. A method developed in-house, combining the subdivision surface and free-form deformation approaches, has been used to create the whole set of design alternatives. The generated design configurations have been assessed analyzing the results derived from application of the first- and the second-level SGIS vulnerability criteria for both the selected stability failure modes. To strengthen the correlation behaviors, the design space has then been further explored by using 10k design configurations exploiting the capabilities of a surrogate model-based approximation, relying on a Gaussian process formulation. The study has been focused on the correlations among the variables and the response functions, i.e., the outcomes of the SGIS vulnerability criteria. The significance, in terms of effects, of each geometry shape variable has been investigated. Results have been discussed in the light of the SGISc structure, to provide further insight into this innovative safety framework for a modern approach to intact stability. 1. Introduction In the last 10 years, the development of the so-called second-generation intact stability criteria (SGISc) has been one of the most engaging topics addressed by the Sub-Committee on Safety Design and Construction (SDC) of the International Maritime Organization (IMO).

Second Generation Intact Stability Criteria Fallout on Naval Ships Limiting KG Curves

2020 ◽  
Author(s):  
Gennaro Rosano ◽  
Ermina Begović ◽  
Guido Boccadamo ◽  
Barbara Rinauro
Keyword(s):  
Dynamic Stability ◽  
Second Generation ◽  
Loss Of Stability ◽  
Stability Criteria ◽  
Parametric Roll ◽  
Intact Stability ◽  
Surf Riding ◽  
Hull Forms ◽  
Onr Tumblehome ◽  
Dead Ship Condition

The International Maritime Organization (IMO) finalized the Second Generation Intact Stability Criteria (SGISC), in February 2020. They are intended to be included in Part A of the 2008 International Code on Intact Stability in the following years. The SGISC consider five modes of dynamic stability failure in waves: parametric roll, pure loss of stability, surf-riding/broaching to, dead ship condition and excessive acceleration. In this paper, two semi-displacement, round bilge and transom stern hull forms, the parent hull of the Systematic Series D and the ONR Tumblehome, i.e. typical naval hull forms, are examined. Although naval ships are not directly impacted by SGISC, they are sensitive to dynamic stability failure phenomena due to their geometry and range of service speeds. The procedures to assess the ship vulnerability to the dead ship condition and excessive acceleration criteria, referring to the latest drafts of the criteria (SDC 7/5, 2019), were implemented in Matlab®,. The limiting KG curves associated with this set of criteria were obtained for each vessel. The minimum allowable KG curve associated with the excessive acceleration criterion was compared with the maximum allowable KG curve associated with dead ship condition, to investigate the existence of a safe operational area.

Application of the Second Generation Intact Stability Criteria in Initial Ship Design

2014 ◽  
Author(s):  
M. Tompuri ◽  
P. Ruponen ◽  
M. Forss ◽  
D. Lindroth
Keyword(s):  
Second Generation ◽  
Failure Modes ◽  
Ship Design ◽  
Stability Criteria ◽  
Parametric Roll ◽  
Safety Measures ◽  
Main Emphasis ◽  
Intact Stability ◽  
Surf Riding ◽  
Additional Safety

The International Maritime Organization (IMO) is revising the Intact Stability Code. The so-called second generation intact stability criteria will provide additional safety measures against stability failures in waves. The draft regulations for three failure modes, parametric roll, pure loss of stability and surf-riding/broaching are reviewed and sample calculations for a fast RoPax ship are presented. The main emphasis is on the sensitivity of the results to the applied input data, which is not very accurate in the initial design phase. The implementation and effects of the new calculations to the ship design are discussed.

scholarly journals Implementation of the IMO Second Generation Intact Stability Guidelines

2021 ◽  
Vol 10 (1) ◽  
pp. 41
Author(s):  
Kyle E. Marlantes ◽  
Sungeun (Peter) Kim ◽  
Lucas A. Hurt
Keyword(s):  
Second Generation ◽  
Practical Implementation ◽  
Container Ship ◽  
Stability Criteria ◽  
Fishing Vessel ◽  
Intact Stability ◽  
Industry Collaboration ◽  
Comparison Of The Results

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.

The Direct Evaluation Method of Dead Ship Stability for Intact Ship

2019 ◽  
Vol 161 (A3) ◽  
Keyword(s):  
Second Generation ◽  
Evaluation Method ◽  
Stability Criteria ◽  
Ship Stability ◽  
Direct Evaluation ◽  
Intact Stability ◽  
Capsizing Probability ◽  
The Dead ◽  
The Difference ◽  
Effective Wave

The International Maritime Organization is currently establishing second generation intact stability criteria, the dead ship stability is considered one important criterion, so the development of its direct stability assessment regulation has become a topic undergoing close review. In this paper a peak-over-threshold (POT) method is proposed to evaluate the dead ship stability, which focuses on the statistical extrapolation that exceed the threshold, also the traditional Monte Carlo simulation is carried out to approve the method. On the basis of verification calculation of the sample ship CEHIPAR2792, the capsizing probability of a certain warship is also conducted. Moreover, the influence of initial stability height GM and effective wave slope coefficient on the capsizing probability is analysed. The results and the possible reason for the difference are examined. This study is expected to provide technical support for the second-generation stability criteria and establish the capsizing probability of damaged dead ship stability.

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