• Title/Summary/Keyword: ship collision avoidance

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A Study on the Ship Collision Avoidance Model considered Speed (속력을 고려한 선박충돌회피모델에 관한 연구)

  • Yang, Hyoung-Seon
    • Journal of Navigation and Port Research
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    • v.30 no.10 s.116
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    • pp.779-785
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    • 2006
  • From a point of view of suggesting the method to avoid ship's collision, the speed of ships has to be considered sufficiently according to encounter angle of ships. But the new safe-guard ring of ship's collision avoidance support model in the close quarters is established assuming that the ratio of own ship' speed to a target ship's speed is less than about 1.7. Therefore in this paper, as doing a study concerned with the establishment of safe-guard ring reflected the encounter angle and the speed of ships, we will propose the new model of ship collision avoidance for safe maneuver of ship's collision avoidance.

A Study on Intention Exchange-based Ship Collision Avoidance by Changing the Safety Domain

  • Kim, Donggyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.3
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    • pp.259-268
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    • 2019
  • Even if only two ships are encountered, a collision may occur due to the mistaken judgment of the positional relationship. In other words, if an officer does not know a target ship's intention, there is always a risk of collision. In this paper, the experiments are conducted to investigate how the intention affects the action of collision avoidance in cooperative and non-cooperative situations. In non-cooperative situation, each ship chooses a course that minimizes costs based on the current situation. That is, it always performs a selfish selection. In a cooperative situation, the information is exchanged with a target ship and a course is selected based on this information. Each ship uses the Distributed Stochastic Search Algorithm so that a next-intended course can be selected by a certain probability and determines the course. In the experimental method, four virtual ships are set up to analyze the action of collision avoidance. Then, using the actual AIS data of eight ships in the strait of Dover, I compared and analyzed the action of collision avoidance in cooperative and non-cooperative situations. As a result of the experiment, the ships showed smooth trajectories in the cooperative situation, but the ship in the non-cooperative situation made frequent big changes to avoid a collision. In the case of the experiment using four ships, there was no collision in the cooperative situation regardless of the size of the safety domain, but a collision occurred between the ships when the size of the safety domain increased in cases of non-cooperation. In the case of experiments using eight ships, it was found that there are optimal parameters for collision avoidance. Also, it was possible to grasp the variation of the sailing distance and the costs according to the combination of the parameters, and it was confirmed that the setting of the parameters can have a great influence on collision avoidance among ships.

Automatic Control for Ship Collision Avoidance Support -3 (선박충돌회피지원을 위한 자동제어-3)

  • 임남균;박건일
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.04a
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    • pp.129-134
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    • 2004
  • Author presented some study with a title of "automatic control for ship collision avoidance system" in previous papers. The paper reported the tread of the study, un-sloved issues and outcome of the study. In this paper, some additional results will be reported. The first is the algorithm of avoidance of group ship that is one of the un-sloved issues. The algorithm is useful when a ship takes an avoiding action toward group fish boats and approaching group merchant vessel. The second is unified model for calculating ship collision risk. The collision risk changes with various meet type of ships. Therefor newly-developed model is suggested to take into account of these situations. Finally simulation is carried out to verify suggested algorithm and model in various ship encounter situations..

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A Study on Development of Ship Collision Avoidance Support Program (선박충돌회피지원프로그램 개발에 관한 연구)

  • Yang Hyoung-Seon;Jeong Dae-Deuk
    • Proceedings of KOSOMES biannual meeting
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    • 2005.11a
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    • pp.15-20
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    • 2005
  • Recently, ship collision accidents account for $20\%\∼30\%$ of domestic marine accidents, also have increased continually. In this paper, therefore we propose the development of Ship Collision Avoidance Support program for decreasing ship collision accidents. This program has been developed on the basis of CCAS-Model. A CCAS-Model has ship's maneuvering performance and has studied for the propose of supporting to avoid ship collision in close quarters. Besides, the program will effectively support maneuvering for collision avoidance through displaying the feasible area and the method of collision avoidance using own ship's turning characteristic about action of target ship's keeping course and velocity in various encounter.

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A Study on Ship Collision Avoidance and Order of Priority Designation Model (선박 충돌회피 우선순위지정 및 회피모델 연구)

  • Kim, Seong-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.11
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    • pp.5442-5447
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    • 2013
  • This paper focuses on development of SCAAM(Ship Collision Avoidance Assignment Model) for avoiding ship collison at sea. We take a new look at DCPA, TCPA, VCD, collision concept for ship collision avoidance and propose SCAAM using DCPA pre-assignmented by a ship master on information collected by other ship's AIS, GPS (course-speed, destination, length, width, tonnage etc). If A ship is a collision situation, the ship master makes a decision where the ship makes a evasion voyage or not continually using SCCAM. If ship master decides a evasion voyage, the ship is voyaged by CORLEGS (International Regulations for Preventing Collisions at Sea). This paper contributes to safety navigation by decreasing the ship collision accident by human's error.

Ship Collision Avoidance System Considering Ship' Maneuverability

  • Lee, Seung-Keon;Surendran, S.;Im, Nam-Kyun;Hwang, Sung-Jun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.1
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    • pp.95-100
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    • 2006
  • A ship collision avoidance system is developed to control the avoidance action of ship actually and properly in wind forces. The 4-DOF maneuvering equations of motion ar derived to catty out the simulation of the motion of a ship, and the wind forces are considered as the external forces in the simulation. This study suggests a new avoidance system that could include the ship's maneuvering characteristics.

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Automatic Ship Collision Avoidance in Narrow Channels through Curvilinear Coordinate Transformation (곡선좌표계 변환에 기반한 협수로에서 선박 자율 충돌회피)

  • Cho, Yonghoon;Kim, Jonghwi;Kim, Jinwhan
    • Journal of the Society of Naval Architects of Korea
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    • v.58 no.3
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    • pp.191-197
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    • 2021
  • This study addresses autonomous ship collision avoidance in narrow channels using curvilinear coordinates. Navigation in narrow channels or fairways is known to be much more difficult and challenging compared with navigation in the open sea. It is not straightforward to apply the existing collision avoidance framework designed for use in the open sea to collision avoidance in narrow channels due to the complexity of the problem. In this study, to generalize the autonomous navigation procedure for collision avoidance in narrow channels, we introduce a curvilinear coordinate system for collision-free path planning using a parametric curve, B-spline. To demonstrate the feasibility of the proposed algorithm, ship traffic simulations were performed and the results are presented.

A Study on Development of Ship Collision Avoidance Support Program (선박충돌회피지원프로그램 개발에 관한 연구)

  • Yang Hyoung-Seon;Jeong Dae-Deuk
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.12 no.1 s.24
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    • pp.47-52
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    • 2006
  • Recently, ship collision accidents account for $20%{\sim}34%$ of domestic marine accidents, also have increased continually. In this paper, therefore we propose the development of Ship Collision A voidance Support program for decreasing ship collision accidents. This program has been developed on the basis of CCAS-Model. A CCAS-Model has ship's maneuvering performance and has been studied for the propose of supporting to avoid ship collision in close quarters. Besides. the program will effectively support maneuvering for collision avoidance through display of the feasible area and the method of collision avoidance using own ship's turning characteristic about action of target ship's keeping course and velocity in various encounter.

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A method of inferring collision ratio based on maneuverability of own ship under critical collision conditions

  • You, Youngjun;Rhee, Key-Pyo;Ahn, Kyoungsoo
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.5 no.2
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    • pp.188-198
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    • 2013
  • In constructing a collision avoidance system, it is important to determine the time for starting collision avoidance maneuver. Many researchers have attempted to formulate various indices by applying a range of techniques. Among these indices, collision risk obtained by combining Distance to the Closest Point of Approach (DCPA) and Time to the Closest Point of Approach (TCPA) information with fuzzy theory is mostly used. However, the collision risk has a limit, in that membership functions of DCPA and TCPA are empirically determined. In addition, the collision risk is not able to consider several critical collision conditions where the target ship fails to take appropriate actions. It is therefore necessary to design a new concept based on logical approaches. In this paper, a collision ratio is proposed, which is the expected ratio of unavoidable paths to total paths under suitably characterized operation conditions. Total paths are determined by considering categories such as action space and methodology of avoidance. The International Regulations for Preventing Collisions at Sea (1972) and collision avoidance rules (2001) are considered to solve the slower ship's dilemma. Different methods which are based on a constant speed model and simulated speed model are used to calculate the relative positions between own ship and target ship. In the simulated speed model, fuzzy control is applied to determination of command rudder angle. At various encounter situations, the time histories of the collision ratio based on the simulated speed model are compared with those based on the constant speed model.

A Study on Mariners' Standard Behavior for Collision Avoidance (1) - A concept on modeling for collision avoidance based on human factors -

  • Park, Jung-Sun;Kobayashi, Hiroaki;Yea, Byeong-Deok
    • Journal of Navigation and Port Research
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    • v.31 no.4
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    • pp.281-287
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    • 2007
  • Human factors have been considered the primary reason of marine accidents. Especially, the collision between vessels is mostly mused by human behavior. However, there have not been many researches to clarify the reason of marine accidents mused by human factors quantitatively. In order to understand human factors and to enhance safe navigation systematically, using a full mission ship-handling simulator, we've investigated the characteristics of avoiding behavior taken by mariners. Further in order to apply the characteristics more widely and effectively, it's necessary to formulate the standard behavior for ship-handling in the condition of collision avoidance. Is this study, therefore, we intended to propose the concept to model the mariner's standard behavior on the handling of collision avoidance as the first step. As a result, we confirmed the contents of information processing in ship-handling that mariner's generally taking to avoid collision.