PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 11

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  anti-collision
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Analysis on the process of ship striking the anti-collision pier
Zhao C., Yan H.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2022
|
Vol. 16 No. 3
501--504
EN
China's extensive inland navigable water system determines that inland navigation must be an important part of China's shipping industry. The collision process of ship striking the anti-collision pier is analyzed through simulation experiment in this paper. The results show that the collision process usually lasts less than 2 seconds, and the peak value of the collision force, friction and resultant force appears 0.5 after the start of the collision.
2
Content available The effect of high ship speed ratio on collision avoidance behavior of COLREGS
Wang X. H., Li L., Chen G.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2019
|
Vol. 13, no. 2
319--323
EN
The speed ratio is an important factor that must be considered when two vessels will course change to avoid collision. In the process of the research on Personifying Intelligent Decision-making for Vessel Collision Avoidance (short for PIDVCA), it is found that the effect of collision avoidance based on the existing “International Regulations for Prevention Collision at sea” (short for COLREGS) is greatly affected by the high speed ratio (k=Vt/V0≥1.5). Through the analysis on the geometric change law of two vessels’ relative motion in Open waters, the effects of the responsibility for the ship collision avoidance under the COLREGS and special case for high-speed ratio is discussed. According to the collision avoidance measures taken for two vessels encounter situation, some reasonable suggestions are put forward and the simulation experiments that based on ship's intelligent collision avoidance simulation platform are given to support the idea.
3
Content available Ship collision avoidance decision model and simulation based on collision circle
Zhang J., Hu Q., Liao B.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2019
|
Vol. 13, no. 2
325--334
EN
In order to give consideration to both comprehensive evaluation and efficient decision-making in collision avoidance decision-making process, a collision avoidance decision-making model based on collision circle is proposed by introducing the concept of collision circle. Firstly, the factors causing ship collision are analyzed. Secondly, the static and dynamic characteristics of collision circles are analyzed and summarized by using collision circle simulation cases. Thirdly, based on the static characteristics, a reasonably distributed collision avoidance decision model of (Possible Point of Collision,PPC) was established. Finally, the spatial data operations core algorithm (Java Topology Suite, JTS) is used for logical operation and visualization, so as to realize the ship collision avoidance evaluation and decision. The decision model was used to verify the accident scenario of "SANCHI", and the results showed that the obtained collision avoidance scheme was reasonable and in line with the "International Regulations for Preventing Collisions at Sea" and safety requirements, thus providing a reference for maritime operators to avoid collisions between ships.
4
Content available Maritime Autonomous Surface Ships (MASS) and the COLREGS: Do we need quantified rules or is “the ordinary practice of seamen” specific enough?
Porathe T.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2019
|
Vol. 13, no. 3
511--517
EN
Maritime Autonomous Surface Ships (MASS) is currently on the agenda in several countries and also in the IMO. In Norway a 120 TEU container feeder is being build and will start sailing autonomously in 2022. The challenge is huge. One question is whether or not the present, quantitative, collision regulations needs to be updated to rules where expressions as “early” and “substantial” are quantified? Or if ships can sail autonomously under the present rules? Another question is if MASS should be marked to signal that the ship is in autonomous mode? Or if it is enough that she follows COLREGS? This discussion paper will take a closer look at these questions and advocate automation transparency, meaning that the behavior of an autonomous vessel has to make sense and be understandable to human operators on other manned ships and crafts.
5
Content available Development of automatic collision avoidance system and quantitative evaluation of the manoeuvring results
Nakamura S., Okada N.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2019
|
Vol. 13, no. 1
133--141
EN
The automatic collision avoidance system introduced in this paper is a system constantly calculating optimal manoeuvring method from the risk and economic preference in the ship manoeuvring space where the course change and the deceleration are performed. The authors also propose a system that quantitatively evaluates the collision avoidance manoeuvring results. Based on the evaluation results of this system, the authors are setting parameters so that ship manoeuvring that does not give anxiety to target ships to be avoided is also realized in automatic collision avoidance manoeuvring. In addition, comparison between the manoeuvring results of the automatic collision avoidance system and the veteran captain's manoeuvring results was quantitatively compared by the proposed evaluation system. Verification experiments were successfully conducted to verify the effectiveness of the proposed automatic collision avoidance system on the actual ship navigating in congested waters.
6
Content available Collision risk mitigating system for light rail vehicles(LRV)
Antkowiak B.
Archives of Mechanical Technology and Materials
|
2018
|
Vol. 38
50--56
EN
This piece is dedicated to the description of the development of collision risk mitigating system. The proposed concept of control system is designed to enhance safety of passengers, a driver and other people in vicinity of light rail vehicles (tramways). The requirements were fulfilled thanks to the application of lidar sensor and feature of vehicle positioning on the track map created basing on precise measurements with the use of satellite navigation system Real Time Kinematic. The map allows to eliminate errors of system operation and to enhance resistance to unfavorable ambient conditions, i.e. temperature or fog. The system calculates work braking distance for particular vehicle speed. In case of obstacle detection which is closer to vehicle than the calculated braking distance, the driver is informed about a collision risk with a buzzer and optical signalization. The system has already been implemented and tested.
7
Content available New system for improving navigation standards (Totem Plus)
Rahav A.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2017
|
Vol. 11, no. 3
409--412
EN
EDA is a tool for auditing vessel’s performance that helps installing strict safety navigation standards on ships. The practice of investigating every near-miss event is common in aviation, but unheard of in the maritime industry. At the same time, major accidents attributed to human errors are increasing, including collisions and groundings that cost lives, pollute the seas and lose property. The idea of EDA, short for E-navigation Data Audit, is simple: analyze the navigational data from VDR and/or ECDIS, find the events that should not have happened (“near misses”), and instruct your ships that it is not the standard you want on your vessels. EDA allows remote auditing on how the bridge team is performing and how the ship is handled, as required by ISM but seldom done. A pilot project for the EDA was carried out during 6 months. The first data showed 18 events of close proximity (“Near-collision”); 4 of them showed severe violation of the International Regulations for Preventing Collisions at Sea (COLREG, 1972). As expected, after sending the EDA first report to the ship, NO such events were found in the next 5 months of the pilot project.
8
Content available Development of analytical method for finding the high risk collision areas
Fukuda G., Shoji R.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2017
|
Vol. 11, no. 3
531--536
EN
The traffic condition has been analyzed by models that are based on Gas model and Obstacle Zone by Target (OZT) by using 1 year AIS data for Tsunami measure. By applying Gas model based method, it is possible to analyze the area in terms of ships' relative angle, size, speed and density. The OZT is originally developed to show the collision zone on the target ship's course. By using this method to the marine traffic analysis, high possibility of collision areas are estimated. Moreover, ships that courses are heading to OZT are identified and studied their position and how long they proceed course heading to OZT.
9
Content available Approach parameters in marine navigation - graphical interpretations
Lenart A. S.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2017
|
Vol. 11, no. 3
521--529
EN
In this paper approach parameters widely used collision avoidance systems such as the distance at closest point of approach and time to the closest point of approach and less known and used as the distance on course, the distance abeam and any distance and the times intervals to their occurrences are derived, analyzed and graphically interpreted in the combined coordinate system for position and motion. They can be used in collision avoidance systems and for reversed purposes - manoeuvring to required approach parameters, intentional approaches and naval tactical manoeuvres.
10
Content available An anti-collision method of slip barrel for automatic ship loading in bulk terminal
Shen Y.
Polish Maritime Research
|
2016
|
S 1
144--151
EN
During the loading operation of a ship loader in bulk terminal, in order to bring bulk cargo, such as coal and ore, precisely into every corner of the cabin and not to raise dust at the same time, the slip barrel mechanism usually is placed fully inside the ship cabin near the cargo as close as possible. However, if too close, it will increase the risk of collision between slip barrel and cargo, which poses a security risk to loading operation. This article proposes an anti-collision method for slip barrel in the process of automatic ship loading in bulk terminal. This method can accurately position the cargo of cabin which is blocked by slip barrel and shovel, and provide a reliable guarantee for the automatic loading operation. Firstly, this method use an array of laser radar mounted on the maintenance platforms to perceive the collision objects around the slip barrel, including the cargo and cabin. Meanwhile, it provides a compensation algorithm to reduce the effect of anti-collision recognition brought by dust and various obstacles during the operation. According to the calculated effective distance between the cargo and slip barrel, the automatic control system of ship loading can adjust the loading operation on a real-time basis. In the end, this article analyze and illustrate the reliability and validity of this method by the case of the application in automatic ship loading system in Tianjin coal terminal.
11
Content available Evolutionary sets of cooperating ship trajectories : COLREGS compliance
Szłapczyńska J., Szłapczyński R.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 1
231--238
EN
The paper presents a newly designed improvement to the method of solving multi-ship encounter situations. In general, the method combines some of the assumptions of game theory with evolutionary programming and aims to find optimal set of cooperating trajectories of all ships involved in an encounter situation. The improvement presented here is a new way of modelling some of the COLREGS rules. Due to this change, the method is now able to find solutions, which are more compliant with COLREGS, more intuitive and consequently – safer from the navigator’s point of view.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.