An alternative methodology for the simplified operational guidance in the framework of second generation intact stability criteria

Petacco, Nicola

doi:10.1016/j.oceaneng.2022.112665

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…The former sets restrictions on the navigation related to the environmental conditions; the latter provides suggestions to the master on how safely handle the vessel in dangerous sailing conditions (i.e., a combination of sea state, route, and speed). Applications of OL and OG can be found in the literature [26][27][28].…”

Section: Second Generation Intact Stability Criteriamentioning

confidence: 99%

An Investigation about Stability in Waves of Large Pleasure Yachts

Petacco,

Ruggiero,

Gualeni

2023

JMSE

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The IMO’s second-generation intact stability criteria (SGISc) have been applied to a set of seven megayacht units ranging from 40 m to 80 m. The application aims to evaluate their stability performance in a seaway. The assessment is based on two vulnerability levels, and the related criteria rely on the physics of the phenomena under investigation (dead ship condition, excessive acceleration, parametric rolling, pure loss of stability, and surf-riding). At the same time, SGISc provide methodological approaches to consider possible operational limitations related to the geographical area the vessel is meant to sail. Results of the comprehensive analysis carried out for the selected megayacht units are presented in term of limiting KG curves. Outcomes pointed out that inconsistencies among vulnerability levels still exist. Further comments about the relation of the investigated vessel typology and relevant operational profile have been reported. In addition, systematic analysis of the effect of the main design parameter on ship rules compliance has been carried out.

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Section: Second Generation Intact Stability Criteriamentioning

confidence: 99%

An Investigation about Stability in Waves of Large Pleasure Yachts

Petacco,

Ruggiero,

Gualeni

2023

JMSE

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“…Researchers such as Begovic et al [21] were focused on rolling motion and proposed a new procedure to be easily implemented in a user's code to assess simplified operational guidance without the use of commercial software at any ship speed and heading. Petacco [22] proposed a new guideline which relies on a simplified numerical tool capable of assessing the rolling motion due to non-linear irregular wave effects in the time domain, keeping computational effort as low as possible. Regarding the operational limitation, according to MSC.1/Circ.1627 [20], it is possible to design a ship to be operated in a specific operational area.…”

Section: Introductionmentioning

confidence: 99%

Proposal of a New Control System Making Use of AI Tools to Predict a Ship’s Behaviour When Approaching the Synchronism Phenomenon

Pérez-Canosa,

Orosa

2024

Applied Sciences

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In spite of the IMO’s efforts to improve the safety of intact stability on ships, synchronous rolling still causes large rolling angles, resulting in a very dangerous situation on board. The implementation of automatic tools to predict this undesirable situation has not been widely implemented. Furthermore, the safety of ship stability is not the only responsibility of people involved in the design process, so ship operators must have enough knowledge to predict and avoid these dangerous situations well in advance. Therefore, from a theoretical point of view, in the first part, this paper aims to present a valuable guiding tool for ship operators in order to predict synchronous rolling and avoid undesirable situations on board by making use of only empirical observations of the wave profile and moments. With this purpose, mathematical models are first proposed, with the ship sailing in the worst condition, i.e., with and without considering the damping factor, at zero speed and considering the influence of any pure beam and trochoidal waves. Relevant results shown provide the exact time and wave profile at which the maximum rolling angles are reached. In the second part of the paper, a new control system making use of AI tools is proposed in order to be used by ship operators on board, avoiding dangerous situations. Finally, the results are validated using a set of ship rolling simulations for the most common and representative ship loading conditions and wave periods.

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“…A review of the SGISC specifically on OMs and subsidiary topics can be found in Shigunov et al [12], and there is an increasing number of publications on OMs [13,14]. A significant amount of research is in progress to regulate the practical application of simplified operational measures, some of which includes studies addressing operational limitations based on the standard WST or modified WST for specific failure modes and ship types [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Standard Wave Scatter Table Limitation for Evaluating SGISC Based on Hindcast Data Analysis

Raj

Enshaei²,

Abdussamie³

2023

Applied Sciences

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The operational measure (OM) of the Second-Generation Intact Stability Criteria (SGISC) is the initial step toward the design of a performance-based dynamic stability assessment of the ship by considering the vessel’s operation, loading condition and weather parameters. The SGISC recommends the standard wave scatter table (WST) for the environmental data, an indefinite requirement for a simplified assessment pathway, which provides the probability of wave occurrence. The existing standard WST was developed based on the North Atlantic Ocean. The study aims to identify the discrepancy in the probability of wave occurrence in the IMO-recommended WST when compared with developed hindcast WST for smaller regions of the North Atlantic Ocean for the application of the SGISC. This study is one of a kind and very significant, given that the assessment using the standard WST provided unrestricted operational ability to ship under the SGISC. The findings of this research provide insights into significant differences in the existing standard WST when compared graphically with hindcast data, especially across different seasons of the North Atlantic Ocean. A case study of OMs on the C11 class post-Panamax container ship for excessive acceleration is provided to better represent the study. In the case study, the operational limitation defined by the hindcast WST for individual sea areas and seasons is compared with the standard WST. This investigation shows that regional and seasonal operational limitations are required for season 4 operation beyond the standard WST safety estimation and that the operational limitation achieved with standard WST is not adequate. The findings suggest that the identified limitations significantly limit the use of a standard WST for unrestricted operational validation in the SGISC. The provided recommendation is very relevant in improving the safety assessment using vulnerability criteria, given that the hindcast data are reliable and available for the season and are also region-specific, and hence the accuracy of the ship stability can be improved while using the SGISC.

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An alternative methodology for the simplified operational guidance in the framework of second generation intact stability criteria

Cited by 6 publications

References 15 publications

An Investigation about Stability in Waves of Large Pleasure Yachts

An Investigation about Stability in Waves of Large Pleasure Yachts

Proposal of a New Control System Making Use of AI Tools to Predict a Ship’s Behaviour When Approaching the Synchronism Phenomenon

Standard Wave Scatter Table Limitation for Evaluating SGISC Based on Hindcast Data Analysis

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