A practical method for stability assessment of a damaged ship

Sun, Xiaofeng; Ni, Yin-Gang; Wang, Zhizhou; Yin, Yixin

doi:10.1016/j.oceaneng.2021.108594

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…Based on the following properties, those variables required to generate statical stability curves could be obtained from the resultant force vector F and resultant moment vector M given in Equations ( 6) and (7).…”

Section: Force-oriented Approachmentioning

confidence: 99%

“…In practice, it is almost impossible to do the integration analytically to obtain the vectors F and M in Equations ( 6) and (7), respectively. Therefore, numerical technique must be developed.…”

Section: Finite Element Proceduresmentioning

confidence: 99%

“…If two forces are not managed well, a floating body may capsize or/and sink even though it is watertight. Therefore, the stability analysis based on statical stability curves plays a fundamental role in design of any floating structures 2–9 …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the stability analysis based on statical stability curves plays a fundamental role in design of any floating structures. [2][3][4][5][6][7][8][9] Conventionally, a statical stability curve is computed through consecutive calculations of geometric variables such as water plane areas, displacement volumes, their centroids, and so forth. [10][11][12][13][14] Therefore, this kind of approach could be referred to as a geometry-oriented one.…”

Section: Introductionmentioning

confidence: 99%

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A mesh insensitive finite element method to compute statical stability curve of floating bodies with arbitrary configurations based on a force‐oriented approach

Zhang

Xie

2022

Numerical Meth Engineering

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For any floating body, statical stability curves play a critical role in its stability analysis. In this article, a force‐oriented approach, in conjunction with finite element procedure, is proposed in order to compute those curves of floating bodies with complicated hull forms. The hull surface is meshed by triangular elements. The buoyant force and restoring moments are directly computed through the load redistribution of the hydrostatic pressure over the facet of each triangular element. Computations of a statical stability curve require a series of floating conditions that lead to the change of waterline with respect to the hull surface. In order to do all computations by using a unique finite element mesh, techniques regarding nodal coordinate update and non‐matching element treatment are developed. The procedure has been established and the algorithm has been developed. Results from three examples with simple but representative geometries are compared to those by hand calculations to verify the accuracy of the approach. Then, two standard reference hull forms, a very large crude carrier (KRISO KVLCC2) and a trimaran (NPL Round Bilge 4a), have been investigated to demonstrate the validation of the approach. Results of all examples show that the proposed approach is insensitive to the mesh pattern.

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Section: Force-oriented Approachmentioning

confidence: 99%

Section: Finite Element Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A mesh insensitive finite element method to compute statical stability curve of floating bodies with arbitrary configurations based on a force‐oriented approach

Zhang

Xie

2022

Numerical Meth Engineering

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“…The trim also affects the values of cross curves and needs to be considered for stability measurements [43]. Damage to the floating 'vessel's structure can affect the stability of the body and is discussed in the literature [44].…”

Section: Introductionmentioning

confidence: 99%

Design and development of a continuous water quality monitoring buoy for health monitoring of river Ganga

Shukla,

Matharu,

Bhattacharya

2023

Eng. Res. Express

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Real-time monitoring of water quality in the river Ganga and other Indian rivers is crucial to determining its suitability for drinking and other usages across the seasons and round the clock. For this, a structurally strong and hydrostatically stable floating observation centre is required for housing all the sensors and related equipment. This paper explains the design process for such a buoy platform that can house an array of water quality sensors powered by hybrid energy harvesting systems. Sensors are connected to a wireless sensor network (WSN) system that transfers data to a web-based platform, where we can monitor and analyse our data for the purpose of hazard prediction. Computational analysis has been carried out for the observatory body to ascertain its structural integrity and hydrostatic stability at small and large angles of inclination. The buoy design is based on various requirements specific to Indian rivers at different locations from the mid-course till the confluence. It is important that the system be modular and portable for use in a constantly changing river/water environment. A full-scale functional prototype has been developed and field testing has been carried out to bring out the efficacy of the proposed system. Also, the WSN system collected real-time water quality data have been validated with laboratory-based experiments. The establishment of a network of low-cost river/water health monitoring system will further initiate the large-scale data collection and help creating digital twins of the Indian rivers.

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Simulation-based uprighting of a capsized ship in wave-induced environments

Pan,

Liu,

Zhang

et al. 2023

J Supercomput

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The present study aimed to find the truth about the effect of ocean waves on the process of righting a capsized ship by employing common computational methods of marine salvage engineering. Mathematical models of ship stability and uprighting were developed to quantitatively evaluate the effects of wave encounter angle on the righting forces, bending moments and torques of the hull during the uprighting process. The results indicated that during the uprighting process, the maximum righting forces of the capsized ship were almost unchanged with a maximum difference of 1kN, when the ocean was calm or when the encounter angle of the waves varied. However, the righting force moment showed significant discrepancies under all conditions, with a maximum difference of 1177.5 kN m. When the wave encounter angle is at 0°, the shear force of some parts of the ship is 2–3 times that of the still water environment, and the shear force of some parts of the ship is 3–4 times that of the wave encounter angle at 300°. Remarkably, the bending moment varied by more than 200% at some particular locations under a particular wave encounter angle. Furthermore, the negative torque variation was relatively minor at a 300° wave encounter angle, and the uprighting process still needs relatively large righting forces.

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A practical method for stability assessment of a damaged ship

Cited by 13 publications

References 19 publications

A mesh insensitive finite element method to compute statical stability curve of floating bodies with arbitrary configurations based on a force‐oriented approach

A mesh insensitive finite element method to compute statical stability curve of floating bodies with arbitrary configurations based on a force‐oriented approach

Design and development of a continuous water quality monitoring buoy for health monitoring of river Ganga

Simulation-based uprighting of a capsized ship in wave-induced environments

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