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Browsing by Title: 36.1 Scientific Journals of the Maritime University of Szczecin

  • Zhou, Minggui; Zou, Zaojian (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Accurate prediction of the ship squat is of significance to ensure safety passage of ships in restricted waters. In this paper, a first-order Rankine source panel method is adopted to predict the squat of a ship sailing in restricted canal. Taking KVLCC2 tanker as example, numerical calculations are carried out for the ship travelling in a canal with different conditions. The results of squat are compared with measurement data and the results from empirical formulas. The influence of canal geometry on ship squat is investigate
  • Zalewski, Paweł (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The formal verification of performance properties of a ship’s course control algorithm used in the InSim simulator of Maritime University of Szczecin is presented in the paper. Implementation of fuzzification, fuzzy rules and defuzzification techniques allowed the construction of a controller tuned in accordance to expert knowledge as an alternative to the industry PID standard. Both controllers’ structures are analysed. Their verification leads to the assessment and comparison of dynamic properties of a modelled ship’s course control. Further development of course controllers into track controllers has been discussed as well
  • Witkowska, Anna (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The problem of synthesis a dynamic positioning system for low frequency model of surface vessel was considered in this paper. The recursive vectorial backstepping control design was used to keep a fixed position and heading in presence of wave disturbances. The passive observer was introduced to smooth the measurements and to estimate the velocities needed for the control algorithm. The computer simulation results were given to demonstrate the effectiveness of that combination of controller-observer system to compensate environmental disturbances
  • Wawruch, Ryszard (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Paper presents basic information on the Constant False Alarm Rate (CFAR) algorithms and assessment of their practical efficiency in maritime FM-CW radar. Experimental research comprised qualitative assessment of the different CFAR algorithms done by the comparison of radar video signals presented by installed in the Gdynia Maritime University FM-CW radar type CRM-203 utilised these algorithms and pulse radars with digital (Raytheon Pathfinder MK2 and NSC 34) and analogue (Racal Decca AC 1690) display units
  • Vidmar, Peter; Perkovic, Marko; Brcko, Tanja (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Cruise ships arriving in the port of Koper carry approximately 1000 to 3000 passengers and crew members. Such a concentration of people presents a high degree of risk in the event of a major disaster, because it is difficult to control, due to limited space, the dynamics of people in the event of a general panic, the presence of large amounts of fuel, proximity of the city center and other vessels and cargo at the port. To avoid the possibility of hazard events, a good safety assessment must be done prior to a ship’s arrival. One of the methodologies for systematically assessing the risk is a Formal Safety Assessment, a tool for determing and evaluating the risk of potential hazards at a cruise ship terminal. This paper discusses the diverse aspects of safety analysis
  • Tong, Ling; Heymann, Frank; Noack, Thoralf (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    This paper studies the performance of pattern matching algorithms with the goal of the detection and tracking of vessel targets in maritime radar images. We compare different methods using a database which consists of radar images from two different manufactures. The data covers a timespan of roughly 4 hours with a one second time resolution. The performance of 3 template matching and 5 feature detector algorithms is tested and the most suitable algorithm is chosen for further optimizations. These optimizations are based on the properties of the radar images and the properties of the radar target
  • Świerczyński, Sławomir; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper presents joint operation of AIS-AtoN and radar. There was brought forward a fact of divergence of the information visualized in radar in cases when AIS receivers are produced by different manufacturers. It happens that the AtoN AIS information is not displayed by radar screen. It is also essential that not every ship is provided with AIS equipment
  • Świerczyński, Sławomir; Świerczyński, Sławomir; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper presents an analysis of the selected robust adjustment methods applied in geodesy, proving thereby justifiability in choosing the applied attenuation function. With a use of the radar navigation methods, the said methods were applied in the process of determination of the observed vessel’s positions
  • Świderski, Waldemar (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The infra-red radiation was discovered in 1800 by English astronomer Sir Wiliam Hirchel but practical appl ications could be dated to the beginning of XX century. First advanced scientific investigations, as well as works relating to the military applications of IR technique were carried out during the First World War. Many applications of IR radiation exist until now. It is generally accepted that taking into account the destination the devices of IR techniques can be divided on three main groups: measuring devices, observation and aut omatic recognition systems. Devices of this type can be found both in Navy and civil marine
  • Stefanowski, Andrzej (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The article discusses causes of steering gear overload at high sea states when a ship is kept on course in aut opilot mode. The presented research results refer to simulations of a ship-autopilot system on a preset course in the presence of varying intensity disturbances (various sea states), with updated alterations of rudder angular velocity (the velocity changes are executed discretely) determined by the function block for conventional sea state determination
  • Stanković, Goran; Kozuh, Mitja R; Petelin, Stojan; Kozuh, Mitja R; Perkovic, Marko; Vidmar, Peter (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Evacuation of people located inside the enclosed area of LNG terminal is a complex problem, especially considering that accidents involving LNG are potentially very hazardous. In order to create an evacuation model managed through fuzzy logic, extensive influence must be generated from safety analyses. A very important moment in the optimal functioning of an evacuation model is the creation of a database which incorporates all input indicators. The output result is the creation of a safety evacuation route which is active at the moment of the accident
  • Przywarty, Marcin; Gucma, Lucjan; Perkovic, Marko (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Paper presents results of a real-time simulation experiment which was carried out to study an influence of speed reduction on the navigational safety of container ships. In order to determine changes in the vessels manoeuvrability set of simulated sea trials was carried out. The tests included the measuring of the movement parameters of ships proceeding with different initial speed in different external conditions
  • Paulauskas, Vytautas; Paulauskas, Donatas (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    LNG import terminals are under construction in the Baltic Sea ports Klaipeda and Świnoujście and should start operations in 2014. LNG tankers in Klaipeda port should cross port up to the end of the port. Probability of possible emergency situations with LNG tankers is very low, but in the same time it is necessary to take all possible precaution measures to avoid accidents with LNG tankers in any cases, especially in port areas. “Black out” on the LNG ships is very dangerous in ports areas, because there is very limited channel’s width and other port water areas, and it is necessary to steer vessel in such situations as well. Theoretical calculations of the precaution measures, simulations and practical training of the ship and tugs masters, port pilots and VTS operators should help in such emergency situations. This article is oriented to explain theoretical calculation methods for the LNG tankers steering by tugs in case of “black out” situations, simulations’ results and practical recommendations for the Port Authorities, port pilots, ships’ and tugs’ masters that will be possible to minimize LNG ships’ incidents and accidents probability in port areas
  • Muczyński, Bartosz; Gucma, Maciej (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The following paper provides information about eye-tracking techniques and methodology. It is focused on introducing eye movement metrics in human factor research in maritime domain, explaining basic methodology and describing the types of data analysis, thus providing the background and guidelines for simple eyetracking studies
  • Lewczuk, Łukasz; Abramowicz-Gerigk, Teresa; Burciu, Zbigniew (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper presents the theoretical and experimental methods used in scientific and operational practice to predict the hydrodynamic loads generated by propellers and thrusters on the hydrotechnical constructions. The influence of different parameters: pitch and rotational speed of the propeller, aft body form of the ship hull and shallow water effect on the velocity field are discusse

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