Wyniki wyszukiwania - Biblioteka Nauki

1

Analysis of Possible Avoidance of the Collision Between M/V Gotland Carilina and M/V Conti Harmony

100%

Wołejsza P. , Magaj J.

Annual of Navigation

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2010

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tom No. 16

165-171

EN

The paper presents the results of collision situation simulations concerning the m/v Gotland Carolina and the m/v Conti Harmony. The simulation aimed at analyzing the causes of the collision and generating manoeuvres that would have resulted in the two ships passing each other. The analysis was made with the use of a Navigational Decision Support System (NDSS). The data to be supplied to NDSS are collected from a variety of sources of navigational information. Then they are processed by specialized computing algorithms and presented to the operator on a display in the alphanumeric and graphic forms. The data on the specific navigational situation from the Danish Maritime Administration (DMA) were used for the generation of signals transmitted to NDSS.

2

Information unfitness as a factor constraining Automatic Identification System (AIS) application to anti-collision manoeuvring

63%

Felski A. , Jaskólski K.

Polish Maritime Research

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2012

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tom nr 3

60-64

EN

Common use of shipboard AIS creates conditions for the use of a new kind of dynamic data in the situation of the risk of collision. AIS position report is a source of supplementary information derived from error leveraged radar measurement. However, in view of the results of the studies there are opinions with regard to inconsistent AIS dynamic data in the process of decision-making by the officer of the watch. By taking into consideration the recordings of the studies and technical specification of AIS it can be concluded that the results of inconsistent data have significant role in collision avoidance manoeuvring.

3

Evolutionary Ship Track Planning within Traffic Separation Schemes – Evaluation of Individuals

51%

Szłapczyński R.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2013

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tom Vol. 7, no. 2

301--308

EN

The paper presents an extended version of the author’s Evolutionary Sets of Safe Ship Trajectories method. The method plans safe tracks of all ships involved in an encounter including speed reduction maneuvers, if necessary, and taking into account Rule 10 of COLREGS, which specifies ships’ behavior within Traffic Separation Schemes governed by IMO. The paper focuses on the evaluation phase of the evolutionary process and shows how fitness function is designed to compare various possible tracks as well as to assess the quality of a final solution. The impact of the fitness function on the method’s results is illustrated by examples.

4

Applied Research of Route Similarity Analysis Based on Association Rules

51%

Xiang Z. , Liu R. , Hu Q. , Shi C.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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tom Vol. 6, no. 2

181--185

EN

In recent years, with the development of information technology, businesses have accumulated a lot of useful historical data, as the shipping industry does. These data can be found deposited a large number of "knowledge", for example, Shipping records for historical information, Ship-Port relations information, Ship-ship relations information, Port & shipping route relations, Shipping route information. It can provide intellectual support to shipping informatization development. Association rules in data mining technology is one of important technologies. The technology, based on sta-tistical methods, can mine the associated and implied "knowledge" from data warehouse ,which has a large number of accumulated data. Apart from this, the technology can also play an important role in the prediction. In this paper, based on FP-growth algorithm, we improve it forming Relevent ships routes. From the prevalent perspective of data mining, deal with the corresponding vessels' dynamic information, ac-quired from the AIS, such as data collection, data statistics. On this basis, get the ship-port relation and ship-ship relation after a certain level of data analysis, processing, handing. Furthermore, this paper use the numer-ous historical ship-port relation and ship-ship relation to build a mathematical model on the ship-port and ship-ship relation. And use the improved association algorithm, FP-growth algorithm, to acquire the strong association rules between ship-port and ship-ship, and eventually mine the similarity of the ship route. Main points of this paper as follows: Collect ,count and check the data, which is from ship dynamic information; Establish the mathematical model between ship-port and ship-ship relation; Improve the algorithm; Analyse the similarity of ship route more accurately using the improved algorithm.

5

Navigation Decision Supporting System (NAVDEC) - testing on full mission simulator

51%

Wołejsza P. , Magaj J. , Gralak R.

Annual of Navigation

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2013

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tom No. 20

149--162

EN

The known navigational systems in use and methods of navigational decision support perform information functions and as such are helpful in the process of safe conduct of a vessel. However, none of these known systems provides a navigator with ready solutions of collision situations taking account of all the vessels in the proximity of own ship, where the Collision Regulations apply. Another shortcoming of these systems is that they do not explain the assessment of a navigational situation and proposed manoeuvre parameters. Results of testing in simulation condition of NAVDEC — new Navigational Decision Supporting System developed by research team of prof. Pietrzykowski [Pietrzykowski et al., 2012a], [Pietrzykowski et al., 2012b] — were presented in this paper.

PL

Znane, będące obecnie w użyciu systemy nawigacyjne, jak również metody nawigacyjnego wspomagania decyzji pełnią funkcje informacji i jako takie są pomocne w procesie bezpiecznego prowadzenia statku. Żaden z tych znanych systemów nie dostarcza jednak nawigatorowi gotowych rozwiązań sytuacji kolizyjnej z uwzględnieniem wszystkich statków znajdujących się w pobliżu oraz odpowiednich przepisów międzynarodowych. Inna wadą istniejących systemów jest to, że nie podają one oceny sytuacji nawigacyjnej i proponowanych parametrów manewru. W artykule przedstawiono wyniki testowania w warunkach symulowanych systemu NAVDEC — nowego nawigacyjnego systemu wspomagania decyzji tworzonego przez zespół badawczy prof. Pietrzykowskiego.

6

Uncertainty in Analytical Collision Dynamics Model Due to Assumptions in Dynamic Parameters

51%

Stahlberg K. , Goerlandt F. , Montewka J. , Kujala P.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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tom Vol. 6, no. 1

47--54

EN

The collision dynamics model is a vital part in maritime risk analysis. Different models have been introduced since Minorsky first presented collision dynamics model. Lately, increased computing capac-ity has led to development of more sophisticated models. Although the dynamics of ship collisions have been studied and understanding on the affecting factors is increased, there are many assumptions required to com-plete the analysis. The uncertainty in the dynamic parameters due to assumptions is not often considered. In this paper a case study is conducted to show how input models for dynamic parameters affect the results of collision energy calculations and thus probability of an oil spill. The released deformation energy in collision is estimated by the means of the analytical collision dynamics model Zhang presented in his PhD thesis. The case study concerns the sea area between Helsinki and Tallinn where a crossing of two densely trafficked wa-terways is located. Actual traffic data is utilized to obtain realistic encounter scenarios by means of Monte Carlo simulation. Applicability of the compared assumptions is discussed based on the findings of the case study.

7

Simulation on vessel intelligent collision avoidance based on artificial fish swarm algorithm

51%

Li W. , Ma W.

Polish Maritime Research

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2016

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tom S 1

138--143

EN

TAs the rapid development of the ship equipments and navigation technology, vessel intelligent collision avoidance theory was researched world widely. Meantime, more and more ship intelligent collision avoidance products are put into use. It not only makes the ship much safer, but also lighten the officers work intensity and improve the ship’s economy. The paper based on the International Regulation for Preventing Collision at sea and ship domain theories, with the ship proceeding distance when collision avoidance as the objective function, through the artificial fish swarm algorithm to optimize the collision avoidance path, and finally simulates overtaking situation, crossing situation and head-on situation three classic meeting situation of ships on the sea by VC++ computer language. Calculation and simulation results are basically consistent with the actual situation which certifies that its validity.

8

Feasibility on Infrared Detection of Cetaceans for Avoiding Collision with Hydrofoil

51%

Yonehara Y. , Kagami L. , Yamada H. , Kato H. , Terada M. , Okada S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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tom Vol. 6, no. 1

149--154

EN

To achieve safer navigation without sudden collisions with large cetaceans at high speed boats such as the hydrofoil, we examined its feasibility of an installation of the infrared camera. Because any ceta-ceans are of air-breathing animals, it is theoretically expected that they can be potentially detected through imaging of the infrared cameras. Thus, we examined the feasibility of detection with aiming at sperm whales in waters off Chichijima Islands (27°4'N, 142°13'E), Japan. Through the experiment, it was revealed that sperm whales could be detected stably within 200m, and detectable cue were blow, back body and fluke tails. However, boats and waves were also detected as noise images. Especially, waves greatly resemble the whale back bodies. Although potential of the infrared camera was confirmed, there are still necessities of further ex-periments including ones conducting at different temperate waters, to successfully install the infrared camera for earlier finding of large cetaceans.

9

Automatic collision avoidance in PowerINSPECT

51%

Dickin P.

Advanced Technologies in Mechanics

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2015

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tom Vol. 2, no. 2 (3)

24--27

EN

The 2015 version of PowerINSPECT, the world’s leading hardware-independent metrology software, includes automatic collision avoidance, faster import of large CAD files, quicker preparation of longer inspection reports, and improved display of results from point-cloud data, plus many other customer-requested enhancements.

10

Trajectory tracking control with obstacle avoidance capability for unicycle-like mobile robot

51%

Kowalczyk W. , Michałek M. , Kozłowski K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2012

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tom Vol. 60, nr 3

537-546

EN

In this paper the trajectory tracking control algorithm with obstacle avoidance capability is presented. As a robot gets into a neighborhood of the obstacle, the collision avoidance behavior is turned on. It is implemented using the artificial potential function (APF) that increases to infinity as the robot approaches a boundary of the obstacle. This feature guarantees collision avoidance. As avoidance behavior is active only in the neighborhood of the obstacle it does not affect the motion when there is no risk of the collision. Authors show that trajectory of the robot converges to desired one when a robot is out of the APF area. Due to a local characteristic of the APF, the implementation of the algorithm of the robot that uses only on-board sensors is possible. The stability proof is presented for both a near obstacle and obstacle-free areas. Effectiveness of the algorithm is illustrated with experiments on a real robot in an environment with static circle-shaped obstacles.

11

The Sensitivity of Safe Ship Control in Restricted Visibility at Sea

51%

Lisowski J.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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tom Vol. 6, no. 1

35--45

EN

The structure of safe ship control in collision situations and computer support programmes on base information from the ARPA anti-collision radar system has been presented. The paper describes the sen-sitivity of safe ship control to inaccurate data from the ARPA system and to process control parameters altera-tions. Sensitivity characteristics of the multi-stage positional non-cooperative and cooperative game and kin-ematics optimization control algorithms on an examples of a navigational situations in restricted visibility at sea are determined.

12

Assisted teleoperation of quadcopters using obstacle avoidance

51%

Mendes J. , Ventura R.

Journal of Automation Mobile Robotics and Intelligent Systems

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2013

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tom Vol. 7, No. 1

54--58

EN

Teleoperation of unmanned aerial vehicles often demands extensive training. Yet, even well trained pilots are prone to mistakes, resulting frequently in collisions of the vehicle with obstacles. This paper presents a method to assist the tele-operation of a quadrotor using an obstacle avoidance approach. In particular, rough map of the nearby environment is constructed using sonar sensors. This map is constructed using FastSLAM to allow tracking of the vehicle position with respect to the map. The map is then used to override operator commands that may lead to a collision. An unknown and GPS denied environment is considered. Experimental results using the USARsim simulator are presented.

13

The influence of parameters of biomimetic underwater vehicle control system on the ability of the vehicle to avoid obstacles

51%

Praczyk T.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2016

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tom R. 57 nr 2 (205)

75--91

EN

Autonomous underwater vehicles are vehicles that are entirely or partly independent of human decisions. In order to obtain operational independence, the vehicles have to be equipped with a specialized software that usually has many different parameters. The parameters decide about effectiveness of the software and in consequence the vehicle. The paper reports experiments performed in simulation, whose goal was to analyze the influence of selected parameters of High-level Control System of Biomimetic Underwater Vehicle on the vehicle ability to avoid obstacles.

PL

Autonomiczne pojazdy podwodne są to pojazdy całkowicie lub częściowo niezależne od decyzji człowieka. W celu uzyskania samodzielności działania muszą zostać wyposażone w specjalizowane oprogramowanie, które zazwyczaj ma wiele różnych parametrów. Decydują one o skuteczności oprogramowania i w konsekwencji pojazdu podwodnego. W artykule zaprezentowano badania symulacyjne, których celem była analiza wpływu wybranych parametrów wysokopoziomowego systemu sterowania biomimetycznym pojazdem podwodnym na jego zdolność do omijania przeszkód.

14

Towards Safer Navigation of Hydrofoils: Avoiding Sudden Collisions with Cetaceans

51%

Kato H. , Yamada H. , Shakata K. , Odagawa A. , Kagami R. , Yonehara Y. , Terada M. , Sakuma K. , Mori H. , Tanaka I. , Sugioka H. , Kyo M.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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tom Vol. 6, no. 1

143--147

EN

Recently, sudden collisions between large cetaceans and high-speed hydrofoils have become problematic to Japanese sea transport in some localities. We therefore initiated a project to investigate ap-proaches for minimizing risk to both ships and cetaceans. Under the present project, the following three sub-projects are underway: clarifying which whale species are found near sea routes and determining their season-al variations; identifying whale species that have a high collision risk; and determining the unique acoustic characteristics of high-collision-risk cetaceans for the improvement of underwater speakers (UWS). By con-ducting acoustic surveys using novel methods, including an anatomical approach based on characteristics of the inner ear, the aim of this project is to accurately estimate the audible range of species with a high collision risk and improve the sounds generated by the UWS. Thus far, we have identified the cetacean species at high-risk in two major sea routes. In the next phase of the study we plan to develop an imaging system that recog-nizes a cetacean's unique blow using an infrared camera, in an attempt to warn of the approach of high-collision-risk whale species at an early stage by sounding an alarm.

15

The assessment of unmanned vessel operation in heavy traffic areas. case study of the North Sea Crossing by unmanned surface vessel sea-kit

44%

Zwolak K. , Miętkiewicz R. , Dąbrowska J. , Tinmouth N.

Maritime Technical Journal

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2022

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tom nr 1 (224)

41--67

EN

The continuous development of autonomous and unmanned technology is accelerating the adop-tion of unmanned vessels for various maritime operations. Despite the technological develop-ments there is still a lack of clear regulatory and organizational frameworks for testing and exploiting the potential of unmanned surface vessels (USVs) in real-world maritime conditions. Such real-world testing becomes ever more complex when operating in multiple nations territo-rial waters. In May 2019 USV ‘Maxlimer’ crossed the North Sea from the United Kingdom to Bel-gium and back, carrying goods, to demonstrate the ability of unmanned surface vessels to interact with real marine traffic in an uncontrolled environment. The paper presents this mission in light of the current state of marine autonomy projects as well as the regulatory works con-ducted by various organizations worldwide.

16

Integration of vision based image processing for multi-axis CNC machine tool safe and efficient trajectory generation and collision avoidance

44%

Ahmad R. , Tichadou S. , Hascoet J.-Y.

Journal of Machine Engineering

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2010

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tom Vol. 10, No. 4

53--65

EN

Demand of high speed production not only increases the complexity of today's CNC process, but also increases the risks and possibility of collision because of the difference between real (machining) and virtual scenes (CAD/CAM process). Idea here is to make this process more intelligent by processing image taken from the real or virtual machine scenes. Identify objects (already known in the CAD database), obtain safe and efficient trajectories that will modify the previous known trajectories from the CAM systems and will be used finally in real machining environments. This work more focuses to improve trajectory generation, collision avoidance and communication in CAD/CAM systems by image processing technique. Safe and Efficient Trajectory (SET) algorithm for point trajectory is discussed along with its extended version for object trajectory known as Rectangular Enveloped object Safe and Efficient Trajectory (RESET) algorithm that will perfectly generate safe un-functional trajectories [3] for multi-axis machine tool envelop. Meanwhile scene objects are detected and identified by image processing tool while trajectory and setup is optimized and improved accordingly in order to avoid collision. This generated trajectory can be used for setup correction before and after production or for "real times/online" production. Finally work has been validated through real and virtual machine scene images.

17

A static walking robot to implement a neural network system

44%

Daya B. , Chauvet P.

Systems Science

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2005

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tom Vol. 31, no 1

27-35

EN

In this paper, we consider the control of a simple static walking robot. We develop a prototype which will be able to test much architecture of artificial neural networks. The mechanism is driven by two servomotors. Its control system comprises an electronic circuit based on a programmable IC. The locomotion of the prototype has six states: forward, turn right, turn left, back right, pivot back and stay. We describe here the mechanism, the characteristics of the drives and the control strategy. In the first experiment which consists in avoiding obstacles, the designed algorithm was successfully implemented in the microcontroller, thus, making the robot intelligent.

18

Collision Scenario-based Cognitive Performance Assessment for Marine Officers

44%

Kim H. , Kim H. J. , Hong S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2010

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tom Vol. 4, no. 1

73--77

EN

The overall aim of this paper is to determine a fatigue factor that can be applied to human performance data as a part of a software program that calculates total cognitive performance. This program enables us to establish the levels of cognitive performance in a group of marine pilots in order to test a decision-making task based on radar information. This paper addresses one of the factors that may contribute to the determination of various fatigue factors: the effects of different work patterns on the cognitive performance of a marine pilot.

19

The Machine Learning Method of PIDVCA

44%

Li L. , Wang X. , Chen G.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2020

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tom Vol. 14. no. 3

533--540

EN

Building a dynamic collision knowledge base of self-learning is one of the core contents of implementing "personified intelligence" in Personifying Intelligent Decision-making for Vessel Collision Avoidance (short for PIDVCA). In the paper, the machine learning method of PIDVCA combined with offline artificial learning and online machine learning is proposed. The static collision avoidance knowledge is acquired through offline artificial learning, and the isomeric knowledge representation integration method with process knowledge as the carrier is established, and the Dynamic collision avoidance knowledge is acquired through online machine learning guided by inference engine. A large number of simulation results show that the dynamic collision avoidance knowledge base constructed by machine learning can achieve the effect of anthropomorphic intelligent collision avoidance. It is verified by examples that the machine learning method of PIDVCA can realize target perception, target cognition and finally obtain an effective collision avoidance decision-making.

20

A perfect warning to avoid collisions at sea?

44%

Baldauf M. , Mehdi R. , Fischer S. , Gluch M.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2017

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tom nr 52 (124)

53--64

EN

Avoidance of collisions is one of the most important tasks for the officer of the watch on a ship’s bridge. Measures and actions required to avoid such accidents are described in the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs) adopted by the International Maritime Organization (IMO) in 1972 and still valid, with several minor amendments, since then. On the basis of a proper look-out at all times, by sight and hearing, and the use of all available means, also including technical equipment installed on-board as well as information provided by a Vessel Traffic Service (VTS), the navigating officer collects traffic and environmental data and combines them with their own ship data to construct a mental traffic image for the assessment of risk of collision with other objects in the vicinity. In the case wherre there is an unacceptable risk she or he has to decide on taking action. In most of the cases decision making is appropriate to the prevailing circumstances and ships maneuver and pass at a safe distance. Only in very rare cases, due to whatever reasons, watch officers fail in taking appropriate actions in good time. It is assumed that, if effective alerting algorithms would be available, a substantial number of collisions at sea, and especially in coastal waters, can be avoided by making the watch officer aware that the ‘last line of defence’ for taking action is close to come. It is assumed that there is potential in applying the principle of the resolution advisory alert of an ACAS (Airborne Collision Avoidance System)/TCAS (Traffic Alert and Collision Avoidance System) in aviation and adapt it to the needs of maritime traffic. In this paper, the authors introduce a method for triggering collision warnings by focusing specifically on the critical last phase of an encounter and taking into account the maneuvering characteristics of the navigating ship. They comprehensively explore the application using scenario studies discussing the operational aspects of varying implementation states (one ship only, SOLAS ships only).