Effective wave slope coefficient of river-sea ships

Rudaković, Stefan; Bulian, Gabriele; Bačkalov, Igor

doi:10.1016/j.oceaneng.2019.106427

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The effective wave slope coefficient for the corresponding vertical centre of gravity as a wave frequency function was calculated using the Froude-Krilov wave exciting moment with a rectangular assumption of the ship's cross-section [12]. Several methods to calculate the effective wave slope coefficient have been proposed [13], but the Froude-Krylov approach seems simpler from a practical point of view. Therefore the IMO recommends this method to calculate the capsizing index for the vulnerability criteria level 2 for the dead ship condition in the SGISC.…”

Section: Methodsmentioning

confidence: 99%

Alternative Method for Stability Assessment of Indonesian Traditional Wooden Boats

Paroka

Azis

Muhammad

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Due to the small down-flooding angle, the available intact stability criteria were difficult to apply to an Indonesian traditional wooden. This paper discusses the application of the dead ship criteria of Second Generation Intact Stability Criteria as an alternative method to assess the stability of the Indonesian traditional wooden boats. The hydrodynamics factors correspond to the formula to calculate the heel angle due to wave were determined by model experiments. The calculations were conducted for four different down-flooding angles consisting of 20 degrees, 25 degrees, 30 degrees and 35 degrees with scattered wave data of Lombok Strait. The results showed that the critical metacentric height decreases if the down-flooding angle increases. The minimum area under the righting arm curve up to the down-flooding angle tends to be independent of the down-flooding angle. The capsizing index corresponds to the critical metacentric height decreased when the down-flooding angle increased. These results showed that the method to assess ship stability in the Second Generation Intact Stability Criteria could be used to evaluate the stability of the Indonesian traditional wooden boats.

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Section: Methodsmentioning

confidence: 99%

Alternative Method for Stability Assessment of Indonesian Traditional Wooden Boats

Paroka

Azis

Muhammad

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…This work focuses on the environmental conditions from [23,24], considering long-crested waves and assuming a Bretschneider spectrum (Table 2). Ship motions have been predicted by a linear seakeeping approach that, for example, was also reported in [25,26]. Several sea conditions about vessel type considered for the investigation have been previous analyzed in [20][21][22].…”

Section: Ship Motionsmentioning

confidence: 99%

“…This work focuses on the environmental conditions from [23,24], considering long-crested waves and assuming a Bretschneider spectrum (Table 2). Ship motions have been predicted by a linear seakeeping approach that, for example, was also reported in [25,26]. In Table 2, the acronym SWH refers to Significant Wave Height, which is defined as four times the standard deviation of the surface elevation [27], while Heading is the relative angle between the direction of the vessel and the propagation direction of the waves.…”

Section: Ship Motionsmentioning

confidence: 99%

Development of a Numerical Simulation Model to Support the Design of a Ship–Satellite Communication System for Autonomous Marine Navigation

Del Mondo,

Seriani,

Gallina

et al. 2023

Remote Sensing

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In recent years, the concept of autonomous navigation systems has gained substantial significance, with the potential to change the traditional concept of autonomous navigation. The presented numerical simulation investigates the feasibility of a ship’s autonomous navigation system through a laser communication infrastructure handled by a two-degrees-of-freedom (DoFs) acquisition, tracking and pointing (ATP) system able to enable ship–satellite data transmission. The methodology introduced presents the geometrical and kinematic delineation of the model, coupled with the implemented control system, aimed at assessing the pointing accuracy. The minimum requested pointing accuracy is 100 µrad and the analysis highlights the need of using methodologies to reduce the pointing error. Two approaches are investigated to examine a possible improvement of the system, and results show that the pointing phase is influenced less by ship motions and more by errors that occur during the satellite’s positioning and the ship motion acquisition process. A trade-off in choosing parameters to improve the system’s accuracy leads to a satellite’s first targeting time of 0.25 s alongside the probability of hitting the target once every 0.0013 s. The reliability of the system is evaluated through a brief sizing of the optical electromechanical component of the system using the trade-off parameters chosen to improve the pointing phase accuracy.

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“…The computation of r(ω) is a key aspect of the assessment of level 2, for which a simplified method is provided, based on Froude-Krylov forcing on equivalent area sections. However, the guidelines permit computational-based methods, which should reasonably include the methods described in [27]. Since most implementations of the guidelines will likely have access to a geometric model of the vessel, it is reasonable to assume that a computational method, based on a linear potential flow strip theory or panel method, would offer an equivalently robust manner to compute r(ω).…”

Section: Ds Levelmentioning

confidence: 99%

Implementation of the IMO Second Generation Intact Stability Guidelines

Marlantes

Kim

Hurt

2021

JMSE

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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.

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Effective wave slope coefficient of river-sea ships

Cited by 8 publications

References 7 publications

Alternative Method for Stability Assessment of Indonesian Traditional Wooden Boats

Alternative Method for Stability Assessment of Indonesian Traditional Wooden Boats

Development of a Numerical Simulation Model to Support the Design of a Ship–Satellite Communication System for Autonomous Marine Navigation

Implementation of the IMO Second Generation Intact Stability Guidelines

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