Ultimate hull-girder-strength-based reliability of a double-hull oil tanker after collision in the Adriatic Sea

Parunov, Joško; Rudan, Smiljko; Ćorak, Maro

doi:10.1080/17445302.2016.1254521

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Among various type of ships, the oil tanker which can bring about a significant amount of pollution has been utilized as a target structure in the simulations and a host of researchers have fulfilled studies with oil tankers to reduce loss of financial properties and to prevent loss of lives and environmental damages (Zheng et al 2007, Tavakoli et al 2010, Kim et al 2015, Faisal et al 2016, Parunov et al 2016, Youssef et al 2014.…”

Section: Collision Scenariosmentioning

confidence: 99%

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Kim

Paik

2018

Ships and Offshore Structures

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Ship-ship collision frequently occurs in shipping industry. The risks of economic losses and marine pollution have been increased by to ship-ship collisions especially involved with large oil tankers or liquefied natural gas (LNG)-fueled ships. Various type of methods are available for the purpose of safety studies in association with structural crashworthiness involving crushing and fracture in ship-ship collisions. In the perspectives of multi-physics and multi-criteria involved, however, the nonlinear finite element method is 2 certainly one of the most powerful techniques to model the problems. In a shipship collision accident where the bow of a striking ship is collided with the side of struck ship, the kinetic energy must be absorbed by both striking and struck ship structures in terms of collision damages and corresponding strain energies.As the bow structure of the striking ship is usually much stiffer than the side structure of the struck ship. It does not allow for deformation and damage.Therefore, no contribution of energy absorption is made by the striking structure. As the energy absorption characteristics of the striking ship depends on the structural arrangement of bulbous bow and flare, however, the contribution of striking ship cannot be entirely neglected. The aims of the present study are to examine the effects of a deformable striking ship structure on the structural crashworthiness of ship-ship collisions using LS-DYNA nonlinear finite element method computations. As an illustrative example in the paper, the struck ship is a VLCC class double hull oil tanker, while the struck ships are two types: a VLCC class tanker and a SUEZMAX class tanker.The relationships between collision forces versus penetration together with their energy absorption capabilities are characterized in association with the contributions of the striking ship bow where the deformable striking ship structures are compared with the rigid striking ship structures. Developed Findings and insights from the present study are summarized.

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Section: Collision Scenariosmentioning

confidence: 99%

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Kim

Paik

2018

Ships and Offshore Structures

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“…In the present analysis, the Aframax class tanker is considered as the struck ship and a ferry as the striking ship (Parunov et al 2016). The main particulars for both the struck and the striking ship are listed in Table 1.…”

Section: Ls-dyna Simulation Of Collisionmentioning

confidence: 99%

“…Such approach enables not only comparison of damage size histograms between IMO and numerical simulations but also establishing mutual correlation among damage length, breadth and height. Finally, the established correlation is employed into the IMO probabilistic model of random damage parameters and consequences on probabilistic models of residual ultimate strength and still water bending moments are discussed.ship respectively (Parunov et al 2016). Numerical simulations are then approximated by surrogate model enabling fast computation of damages for different collision scenarios characterized by striking ship speed, collision angle, collision location and displacement mass.…”

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Numerical investigation on a side-shell structure subjected to collision impact load

Chen¹,

Soares²

2017

Progress in the Analysis and Design of Marine Structures

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The aim of the present paper is to investigate a correlation between collision damage parameters, which could improve Monte Carlo simulation of random collision damages and facilitate its implementation into the risk assessment of maritime transportation. The proposed approach is based on the explicit LS-Dyna simulation of the collision between a ferry and an Aframax tanker, as striking and struck ship respectively. Numerical simulations are then approximated by the surrogate model enabling evaluation of damage for different random collision scenarios characterized by striking ship speed, collision angle, collision location and displacement mass. Monte Carlo simulation of random collision scenarios is then employed to obtain histograms of damage parameters that can be compared to IMO probabilistic models. Such approach enables not only comparison of damage size histograms between IMO and numerical simulations but also establishing mutual correlation among damage length, breadth and height. Finally, the established correlation is employed into the IMO probabilistic model of random damage parameters and consequences on probabilistic models of residual ultimate strength and still water bending moments are discussed.ship respectively (Parunov et al. 2016). Numerical simulations are then approximated by surrogate model enabling fast computation of damages for different collision scenarios characterized by striking ship speed, collision angle, collision location and displacement mass. MC simulation of random collision scenarios is then employed with surrogate model to obtain histograms of damage parameters that can be compared to IMO probabilistic models. Such approach enables comparison of histograms of damage size between IMO and numerical simulations as well as establishing a mutual correlation between damage length, breadth and height.Correlation is then employed to the IMO probabilistic model of random damage parameters and differences on probability density functions are observed. Consequences of the correlation on the two main pertinent random variables influencing hull girder safety of damaged ship-residual ultimate strength and still water bending moment, are studied. Conclusions about practical importance of correlation among random damage parameters are finally drawn.

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“…In the present study, an average sea condition along the ship route in the Adriatic is assumed for the structural reliability assessment of damaged ship. Such average sea condition is calculated for the Palagruža region, using a wave scatter diagram obtain based on calibrated satellite data and numerical wave model simulations from WorldWaves (WWA) database [26] as described by Parunov et al [27]. Wave loads in short-term sea conditions are calculated by design charts developed by Parunov and Ćorak [25], based on linear 3D panel hydrodynamic method.…”

Section: Wave Loads Of a Grounded Ship In The Adriatic Seamentioning

confidence: 99%

Structural Reliability Assessment of an Oil Tanker Accidentally Grounded in the Adriatic Sea

Ćorak

Parunov

Soares

2017

Volume 3A: Structures, Safety and Reliability

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The aim of the paper is to present a methodology for the assessment of the structural reliability of an oil tanker damaged in a hypothetical grounding accident in the Adriatic Sea. The grounding accident affects the ultimate hull girder capacity in the damaged region, the still water bending moment (SWBM) distribution along the vessel as well as the vertical wave bending moments (VWBM). The extent of the damage on the ship's hull after a grounding accident depends on several parameters such as ship`s speed, rock size, penetration depth, longitudinal and transversal location of stranding along the hull. These parameters are in the present study assumed as random variables, described by probability density functions. Based on defined statistical properties, random realizations of grounding parameters are simulated by Monte Carlo (MC) simulation. For each such random grounding scenario, the damage size is calculated by the surrogate model based on numerical grounding simulations. Residual ultimate strength and SWBM distribution are determined based on the size and location of the damage. VWBM is calculated for average sea state in the area with increased risk of grounding accident in the Adriatic Sea. Structural reliability analysis is employed to determine the safety index with respect to the ultimate hull girder failure for salvage period of 12 hours. As each grounding scenario results in different hull-girder reliability, histogram of safety indices is obtained representing new measures for the performance assessment of the damaged ship.

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Ultimate hull-girder-strength-based reliability of a double-hull oil tanker after collision in the Adriatic Sea

Cited by 11 publications

References 15 publications

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Numerical investigation on a side-shell structure subjected to collision impact load

Structural Reliability Assessment of an Oil Tanker Accidentally Grounded in the Adriatic Sea

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