Ship collision analysis pdf

A method for assessment of the survival time of a ship damaged by collision. The speed a ship maintains in a channel cannot always be arbitrarily reduced, since headway may be needed for control of the ship, and some diesel ships have a minimum operating speed. The analysis methods for collision energy between ships and offshore platforms. In order to analyze the pdf of vessel traffic for each gate line, the traffic. Collision and grounding of passenger ships risk assessment. This paper also conducts a sensitivity analysis, focusing on collision points. Empirical methodthe collision analysis models were first developed for analyzing the design of ships transporting nuclear materials. The results indicate that at ship velocities exceeding 7. Probabilistic approach for collision risk analysis of. This paper deals with ship jacket platform collisions. Pdf a study on ship collision avoidance algorithm by. This dissertation aims to unify the rules of apportionment o f liability in collision cases. Analysis of structural damage on the struck ship under side.

Ropax ship collision a methodology for survivability. Collision energy losses, collision forces and structural damages are determined. Plastic and elastic responses of a jacket platform. In phase 1, the basic parameters of the ship model are determined according to its and size structure and a finiteelement ship model is built with patran. The simplified analysis process is shown in figure 1. Fundamentally, there are two basic approaches to addressing the hazards faced by an offshore facility. World journal of engineering and technology, 5, 601612.

Thats why the majority of currently available models deliberates only right angle collisions. The ships that collide with offshore platforms can be generally classified as visiting vessels or passing vessels vinnem, 2007. Therefore, a collision risk analysis becomes a necessity in the predesign stage of an offshore wind farm in order to identify the collision scenarios having the greatest probabilities of occurrence but also the most dangerous ones. Both structures in a ship to owt collision are to be considered deformable. Alternatively, vessels under tow which have slipped their towline. It concerns the interaction between major factors such as the environment, ships and humans, dynamic and static data, known and uncertain information, quantitative mathematical calculations and qualitative logical reasoning, etc. Mathematical models for ship collisions are studied in this thesis. Analysis of causes of collision caused by human error of captain. Shipship collision probability of the crossing area between. Ship collision accidents tend to increase every year. Evaluating ship collision risks work performed a method has been developed to calculate the probability of occurrence of a ship collision using ais data, this provides information on the likelihood and the geographical locations of the collision events future work a multicriteria ship collision risk index will be developed combining the. Static versus dynamic analysis of ship collision with offshore structures is discussed.

Studies on the application of bayesian network in the cause. Ship collision accidents account for the majority of marine. Here the formal risk definition is the product of collision frequency collision rate and collision consequence. This paper presents a userfriendly rapid prediction tool of damage to struck and striking vessels in a ship collision event. The consequences of a ship collision vary depending on the location and type of drilling installation.

The work concerning deterministic analysis of ship collisions includes the following main. Analysis and design of ship collision barriers on a. A ship collision analysis program based on upper bound. Models and computational algorithms for maritime risk. The risk for a ship collision is usually predicted to be one of the dominating risks for an offshore installation.

At the beginning of the collision event, local crushing occurs in the impacted area. Plastic mechanism analysis of the resistance of ship longitudinal girders in grounding and collision. There is an option to perform a simplified analysis. In this paper, one approach of assessing structure strength for jackup ship collision is put forward. Probabilistic approach for collision risk analysis of powered.

Finite element damage analysis of an underwater glider. The collision problem is a strong nonlinear problem, so the author tries analyzing the collision in details is too complex even impossible. Ropax ship collision a methodology for survivability analysis. In this paper, one approach of assessing structure strength for jackup ship collision.

They outline a probabilistic procedure where these tools can be used by the maritime industry to develop performance based rules to reduce the risk associated with human, environmental and economic costs of collision and grounding events. Sep 01, 2018 analysis of ship ship collision damage accounting for bow and side deformation interaction mar. When considering ship bow toship side collisions, the bow of the colliding ship can be assumed to be rigid 3. Detailed nonlinear finite element analysis has been found to be a valuable tool for analysing and assessing collision. Collision analysis of the unconventional double hull of a ship. Method to predict probabilistic damage brown and amrozowicz 1996 the process begins with a set of probability density functions pdfs defining possible collision scenarios. The barrier is modelled as a straigth rectangular cylinder, with clamped ends. Zhang 6 in his doctoral research work developed models for ship collisions where collision energy loses, collision forces and structural damages were determined.

Pdf parametrics for extent of damage as a function of struck ship design figure 1. However, the rate of marine accidents due to human error has not been reduced yet. Some offshore wind farms in europe have been built and numerous projects are on the drawing tables. An improved ship collision risk evaluation method for korea. Finite element damage analysis of an underwater glidership. Pc 3 where ni is the probability number of collisions. Ship collision, bayesian network, probability analysis. Submitted to journal of ships and offshore structures, 2008. Simplified analysis and design of ships subjected to. Ship collision with offshore installations is one of the key concerns in design and assess of platforms performance and safety. Based on these pdfs, a specific scenario is selected in a monte carlo simulation, and combined with a specific ship structural design to predict collision damage. Experiments and researches on the ship operators using the ships in actual. This paper also discusses the application of ship and barge collision risk analysis procedures to model complex navigation channel geometries near bridges and. The platform or rig is treated as either rigid or flexible and its.

Analysis and design of ship collision barriers on a submerged. Ship collision wind loads soil properties spring elements rigid beams a series of headon collision were analysed for three different values of the impact velocities. One of the first works about singular structures was made by wierzbick i 1983 and hayduk and. Analysis of structural damage on the struck ship under. In this paper, the proposed algorithm decides whether the own ship is a giveway vessel or a. The analysis of the course recorder traces seems to lay to rest the theory that the wrong radar range scale was used by the 3rd mate of the stockholm just prior to the collision. Many study ways of ship bridge collision have been developed. Pdf is then calculated for ulsan port using gate lines installed in 2014 and the.

The barrier design is based on local and global strength considerations. Varying risk measurement for ship collision prevention. Journal of ships and offshore structures, 2008, 33. The contributions give the state of the art and point to future development trends with in the focus areas. An improved ship collision risk evaluation method for.

Ship collision analysis on offshore wind turbines with. Simplified analysis and design of ships subjected to collision and. Keywords gliders collision finite elements damage 1 introduction underwater gliders, or gliders for short, are a class of autonomous underwater vehicles propelled by a buoyancy engine. Pdf ship collision, risk analysisemergency systems. Pdf a study on ship collision avoidance algorithm by colreg.

Numerical analysis of ship to owtcollisions basically is an extension of the calculation of ship to ship collisions. A simplified collision model simcol is currently being developed at virginia tech to conduct probabilistic analysis of damage in ship collisions and ultimately optimize ship structural designs to improve crashworthiness. The mixed research me thodology of quantitative and qualitative research and analysis has been utilized in this paper. A numerical simulation using fem was conducted to produce computed results to be used as the reference for the effectiveness of the proposed bulbous bow. The basic impact load model on deep water piership collision. Modelling of collision within the nonlinear space frame.

The publication ship collision analysis, proceedings of the 1998 international symposium, presents the papers of international experts in ship collision analysis and structural design. Bae and lee 10 conducted a sensitivity analysis of the risk assessment factors for the incheon bridge using ship navigation data from 2010 and suggested that ship collision risk is an important factor determining the design of offshore bridges. Jackup installations are more susceptible to catastrophic structural failure due to ship collision, as a collision with a leg could cause the installation to. The model can be used in the cause analysis in the probability of ship collision and prediction of accident probability in practice and thus effectively reduce the ship collision accidents. Pdf todays merchant ships confront a great number of operational requirements set both by the shipping community and the international community.

Internal mechanics must be coupled with an external dynamics solver dedicated to simulate the global ship motion, taking into account the forces due to the surrounding water but there are very few analysis procedures where the internal and external dynamics are completely coupled. Accident records show that sooner or later hindrances near a waterway will be hit by ships, be it navigation marks, bridge structures, reefs or shallows. Pdf ship collision analysis using finite elements researchgate. Development of a mathematical model for analysis on ship. This is the background of the simplified analysis method of ship impacting bridge1. By careful analysis of the course recorder traces, mr. Collision data for validation of simcol is very difficult to obtain, and model testing is very costly. The above analysis shows that to avoid the meeting of two ships at a potential collision zone or point, there is a need to either slow down one of the ships allowing the other to move faster past the collision point first, or to slow down both ships, preventing them from reaching the collision point at the same time or allowing one or both of. A ship collision analysis program based on upper bound solutions. Halpern points out the role that the helmsman of the stockholm played in the collision. Simulation models of a ductile and a rigid supply vessel were developed, as well as models of two typical jacket platforms. Collisions damage assessment of ships and jackup rigs. Detailed nonlinear finite element analysis has been found to be a valuable tool for analysing and assessing collision events.

This paper presents an analysis on collision energy and structural damage in ship and offshore platform collisions for various collision scenarios. The impact forces depend on the available kinetic energy of the ship and time interval over which the impact takes place. Formal safety assessment fsa for analysis of ship collision. Collisions between ships and collision accidents with bridges have also been considered. Plastic and elastic responses of a jacket platform subjected. Guidance notes on accidental load analysis and design for. It is necessary to study the effects of these wind farms with respect to the safety of shipping in order to estimate the related risks to people, ship traffic and the environment. Dynamics of ship collisions analysis of collision forces has been carried out by european and japanese investigators, but these studies are not as yet complete. The proposed measurement considers the level of danger of the approaching ships and the capability of a ship to prevent collisions.

Ship collision accidents account for the majority of marine accidents. Furthermore, elastic and plastic response of jacket platform is studied. For ships with small underkeel clearance, most of this energy will be dissipated in a major collision, even if the impact is oblique. Analysis of structural crashworthiness and estimating safety limit. Introduction with the rapid development of economy, various. Once a certain value of the local indentation is reached, an overall bending of the structure. Studies on the application of bayesian network in the. Ship collision, risk analysis emergency systems collision. Probabilistic method for predicting ship collision damage. Pdf a mathematical model for analysis on ships collision. An integrated analysis of ship to ship collision was presented in this paper.

Collision analysis of ships and jackup rigs dtu orbit. To stress the characteristics of the ship under a collision, a ship rigid wall. Evacuation analysis requirements for passenger ships the evacuation analysis requirements do not state that advanced simulation software must be used for the analyses. The worst case was considered by the total inelastic right angle collision with the struck ship. Based on this point, the following takes the frequency of ship accidents and oil spillage as the type analysis to continue the study in this article. Survivability analysis of a struck ship with damage opening influence from model and material properties uncertainties. Ship safety following a collision accident event is bound to the. Mujeeb ahmed a,b, jung kwan seob, jeom kee paika,b,c a department of naval architecture and ocean engineering, pusan national university, busan 46241, republic of korea. Rapid assessment of ship grounding over large contact surfaces. Shipship collision probability of the crossing area.

The design of the ship model is based on the cruise ship ms balmoral. There is an option to perform a simplified analysis using only pen and paper. Jackup installations are more susceptible to catastrophic structural failure due to ship collision, as a collision with a leg could cause the installation to collapse. A collision analysis of a model of a bow and barrier is carried out.