A combined numerical and semi-analytical collision damage assessment procedure

Chemical tanker traffic constitutes a hazard for the environment; large chemical spills caused by, for example, shiptanker collisions can have catastrophic effects in similar manner to oil spills. For this reason, it is important to have a generalized spill model for chemical tankers, so that the spill size for a given geographical area can be assessed. The spill volume can be used as an indicator of risk in the given area. Furthermore, such a model can be used to analyze the possible effects of potential risk-mitigating measures such as requiring wider double hulls for chemical tankers. In this article, a spill model is proposed, which for a given collision scenario can model the penetration, spill probability, and size caused by a ship striking a chemical tanker. This is done using finite element method, MATLAB, and statistical metamodels with ship particulars extracted mainly from automatic identification system data from the Gulf of Finland.

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“…The FE simulations Adapted from Ehlers and Tabri. 15 were stopped after the bulb penetrated 2 m into the struck ship at a perpendicular angle.…”

Section: Fem Results and Generalized Matlab Modelmentioning

confidence: 99%

Collision consequence estimation model for chemical tankers

Sormunen

Ehlers

Kujala

2012

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…One example is a simplified shared-energy approach presented by Daley and Kim [38], where the localized plastic response is modelled linearly, and the linear response, depending on the structural arrangement, is determined with FEA and the design of experiments methodology. The more standard hybrid models use analytical energy methods to determine the kinetic energy of the interaction and employ FEA to model the structural response of the loading condition [32,39,40].…”

Section: Types Of Collision Modelsmentioning

confidence: 99%

Shared-Energy Prediction Model for Ship-Ice Interactions

Price

Quinton

Veitch

2021

Day 2 Thu, October 28, 2021

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Low- and non-ice-class ship-ice interactions are modelled with a shared-energy approach, which typically models the internal mechanics with nonlinear finite element methods. For applications like the preliminary design phase and quick operational assessments of the ship’s structural capabilities, a finite element shared-energy approach can be time consuming and information intensive, therefore, an analytical share-energy algorithm is proposed. The proposed algorithm applies the upper bound energy methodology by equating the external collision energy, determined with the Popov collision model (Popov, et al., 1967), to the sum of the internal ice and structural response energies. The distribution of the internal energy, between the ice and the structure, is determined by iterating through possible shared contact forces until the sum of the internal response energies equals the external energy introduced into the system. The ice-crushing energy is modelled with Daley’s (1999) energy based ice collision force models, and the internal structural strain energy is modelled through a combination of classical beam theory and design of experiments methodology. The proposed model is benchmarked against a finite element ice wedge-ship grillage structure interaction.

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“…Several methods for assessing ship damage resultant from collision have been developed. The comprehensive study of today's methodology of ship collision consequences is presented in [25] and [26]. These methods in terms of the number of input parameters can be divided into dedicated methods (numerical methods), general methods requiring only general parameters (analytical), and combined methods [27,28].…”

Section: Determining the Consequences Of An Accidentsmentioning

confidence: 99%

Risk Assessment of Moored and Passing Ships

et al. 2020

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Accidents in port areas are generally relatively minor given the lower prevailing speeds, but dangerous cargo terminals located in the vicinity of populated areas present some risk of accidents with catastrophic consequences. The maritime risk assessment frameworks have been developed in many ports, but few include studies incorporating collisions between sailing and moored ships. This paper presents the risk assessment framework for such accidents. Moreover, it presents the important role of harbour regulations in the navigation risk management process within the port area. Today’s port regulations are created mostly based on the good practice of pilots and other experts, whereas quantitative methods are used less frequently. The intention of the presented case study was to demonstrate how quantitative risk assessment may be used in port policy development, which is why the method created is general and may be used in any terminal with dangerous cargo. The multi-stage method consists of several steps that make up a complex methodology, consisting of expert study, real-time simulation—a simulation of a collision in port is presented—and analytical-empirical calculations for consequence assessment. The case studies of the developed method are presented based on two real accidents, one in the Police port along the Świnoujście-Szczecin waterway, and the second in the Port of Koper in Slovenia. The results of this study present the parameters of the ship’s safe approach to the terminal area, such as velocity and approaching angle. These parameters are used to calculate the impact forces in the case of a collision between a moored and passing ship and its consequences on ship integrity as well as on mooring arrangement. Based on probability and consequences, the risk is evaluated and discussed in the sense of port safety. The presented method could be used as the framework for risk assessment of collisions in a port area, particularly when dealing with dangerous cargo or sensitive vessels such as cruise ships.

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A combined numerical and semi-analytical collision damage assessment procedure

Cited by 19 publications

References 9 publications

Collision consequence estimation model for chemical tankers

Collision consequence estimation model for chemical tankers

Shared-Energy Prediction Model for Ship-Ice Interactions

Risk Assessment of Moored and Passing Ships

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