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06 Scientific Journals of the Maritime University of Szczecin, no. 6 / 2005



 

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  • (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Table of content
  • Artyszuk, Jaroslaw (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The present study compactly demonstrates the drigt-nondimensional yaw correlation limit a wide range of accelerated turing tests and zigzag tests based on manoeuvring simulation. Next, the problem of tracking an arbitary drift andelnondimensional yaw velocity trajectory (important in the identification of hyll hydrodynamic forces) is solved by means of two differential equations with derivatives versus drift angle. Finally, additional valuable sets of differential equations are formulated with travelled distance or heading as independent variable - most of manoeuvring commands relate to those parametrs, as to be easily observed and having both navigational and hydrodynamic singnificance.
  • Artyszuk, Jarosław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The fundamental fact about manoeuvring of geometrically similar ships, of whatever length (or size) and initial steady approach speed, including scale physical models and the whole series of full-scale ships (if they really exist), is that the nondimensional track (in ship length units), the drift angle and the nondimensional yaw velocity are maintained. The only difference is the allocation of time moments to subsequent ship positions and/or heading. The higher is the speed and the shorter is the hull length, the time 'runs' faster. The present paper deals with a methodical explanation of these phenomena in view of building the manoeuvring model for a virtual ship of arbitrary size. Problems with satisfying the similarity of propeller parameters, the occurrence of scale effect in the resistance coefficient, and the consequences of variation in the ratios of main dimensions are analysed against the increasing ship length.
  • Bąk, Andrzej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents the process of producing a chart for the pilot navigation system. The structure of databaseand s layered structure of the chart itself are presented. The author put emphasis on necessary chart requirements. Finally, original computer applications are presented as a useful tool in making navigation system charts
  • Blokus-Roszkowska, Agnieszka; Kołowrocki, Krzysztof (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents the results on systems’ reliability related to their operation processes and the results on limit reliability functions of parallel-series systems. The results of the asymptotic approach to the evaluation of multi-state parallelseries system reliability and availability are presented. Finally, their application to the ship-rope transportation system evaluation is given.
  • Bober, Ryszard; Grodzicki, Piotr; Kozłowski, Zenon; Wolski, Adam (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents results of research aimed at possible applications of reference corrections to the GPS from Dziwnów Station within the port of Szczecin
  • Cepowski, Tomasz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents approximations of roll amplitudes of a S-175 containershipoccurring in irregular waves on the basis of main service parameters. Standard values of ship’s roll were determined by means of exact numerical methods by using the SEAWAY software. The relationships were elaborated by means of artificial neural networks and presented as an analytical function. The proposed approach may be used to approximate real values of roll angle amplitude on the basis of data recorded onboard the ship during its service.
  • Dziełak, Ewa; Jóźwicki, Paweł (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This article includes a mathematical description of calculating the accuracy of movement parameters of an encountered vessel and a comparison of required accuracy specified in IMO resolutions and theoretical calculations.
  • Gucma, Lucjan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents different phases of largeIT project creation – the simulation environment of movement and maneuvering of ships for the needs of pilot navigation systems (PNS). The particular effort was placed on new methods of object modeling with the use of UML (Unified Modeling Language), which is a standard used for proper management of the object programming development process.
  • Gucma, Maciej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article presents expert knowledge research on a Graphical User Interface (GUI) in the Pilot Navigation System (PNS) with use of questionnaires. This research may directly lead to the construction of an optimal GUI.
  • Gucma, Maciej; Ślączka, Wojciech (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article presents the results of simulation research on a PNS (Pilot Navigation System) display for mooring maneuvers. In the research, a group of experts performed simulated runs. An analysis of those runs has been performed, with consideration given to berthing energy. Also, task forms filled out by experts have been analysed.
  • Gucma, Maciej; Ślączka, Wojciech (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article presents the results of simulation research on a PNS (Pilot Navigation System) display for a confined waterway passage. In the research a group of experts performed simulated runs. The runs have been analysed with the use of safe maneuvering area criterion. Also, expert task forms have been analysed.
  • Gucma, Stanisław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper describes research, done at the Marine Traffic Engineering, Szczecin Maritime University, on optimal solutions to the Pilot Navigation System Presented are guidelines for the construction of an optimal PNS, research problems being solved and methods of finding solutions. Optimal parameters of prototype pilot navigation systems (both stationary and portable) have been defined.
  • Jankowski, Stefan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The vessel’s position and its heading are necessary to display its shape on an electronic chart. This paper describes an experimenal determination of heading accuracy. There are two types of pilot navigation systems: stationary and portable, and they may use various sources of heading data. Particularly a gyrocompass and GPS compass were tested and verified by the heading determined by two RTK receivers.
  • Jankowski, Stefan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The vessel’s position in different electronic chart displays is represented by different shapes. That shape in a pilot navigation system should correspond to the real horizontal outline of the vessel. This is very important during maneuvering in restricted waters, because the vessel operator assesses its safety on the basis of distances between the shape and obstructions. The paper presents a method of modeling vessel’s shape in a portable pilot navigation system.
  • Januszewski, Jacek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The distributions (in per cent) of VDOP coefficient values for GPS nominal (27 satellites) and present (27,28 and 29 satellites) constellations are demonstrated. Different masking elevation angels for different observer's latitudes are considered. The GPS position and vertical accuracy in the "3D" mode and the position accuracy in the "2D" mode for different receivers and for different receiver's antenna heights are presented as well.
  • Kasyk, Lech (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The author has determined boundary velocities of a ferry which guarantee a safe crossing of the intersection. These velocities have been calculated for each point of the intersection. This idea is based on the concepts of the vessel’s domain at the intersection. A field of ferry velocities makes it possible to construct a control area of entry into the intersection.
  • Kołowrocki, Krzysztof; Kwiatuszewska-Sarnecka, Bożena (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The reliability and availability characteristics of a port bulk cargo transportation system have been determined under the assumption that it is a four-state renewal system with the negligible renewal time. Further, two methods of the reliability improvement of this system components have been applied and their effects have been compared.
  • Kołowrocki, Krzysztof; Soszyńska, Joanna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper proposes the use of the limit reliability functions in the systems’ reliability and availability evaluation and semi-markov processes application for their operation modelling. The paper offers an approach to the solution of a practically very important problem of linking the systems’ reliability and their operation processes. An application of the proposed method is illustrated in the evaluation of reliability, risk and availability of the port grain transportation system.
  • Kołowrocki, Krzysztof; Soszyńska, Joanna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper proposes the use of the limit reliability functions in the systems’ reliability and availability evaluation and semi-markov processes application for their operation modelling. The paper offers an approach to the solution of a practically very important problem of linking the systems’ reliability and their operation processes. An application of the proposed method is illustrated in the reliability, risk and availability evaluation of a port oil transportation system.
  • Kozak, Magdalena (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The Digital Terrain Model (DTM) has been used more and more often in modelling the land or the bottom of the sea and other water systems. It has been adopted in navigation to estimate the safety, in computer vessel traffic simulating programms and in comparative navigation to create the patterns of the bottom of the sea. This article presents the research in reducing the amount of data that is necessary for the visualisation of the bottom of the sea with the use of RBF networks.
  • Lushnikov, Evgeniy (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article discussen new elements for teaching, containded in the formulation of the gyrocompass theory. Zero entry conditions at an angle of daviation form true horizon of a gyro sensor are taken into consideration. Final solutions of the differential equations are written down onlu with the help of the most generalized paramteres of gyrocompass. The new concept simplifies understanding of the basics of the gyrocompass theory and allows using broader categories for desribing its properties.
  • Łebkowski, Andrzej; Śmierzchalski, Roman; Tobiasz, Marcin; Dziedzicki, Krzysztof; Tomera, Mirosław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article presents a simulator for testing the operation of automatic systems controlling ship's movement in situations where a collision is a real threat, particularly in poor hydro-meteorological conditions. The goal of the presented system is to support the navigator in decision making, with possible full replacement of his work in the future. Discussed is a method of determining a safe trajectory for the ship, and controlling its movement along this trajectory.
  • Majzner, Piotr; Piszczek, Wojciech (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This article presents an application of the deterministic analysis method and computer simulation for the research into the vessel traffic flows at an approach channel and a fairway. The simulation model used takes into consideration the random character of vessel reports at the fairway approach area. The research included various structures and intensities of traffic flows concerning vessels approaching the examined fairway section. It has been shown that the presented computer simulation method is useful in the identification and assessment of vessel traffic parameters.
  • Maleika, Wojciech (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The author presents the results of experiments on compressing / decompressing the data describing sea-bottom structure by means of lossless compression based on LZ77 and PPM. In order to increase the compression ratio, the input data were transformed (reordered) and stored in a differential form. These data were then compressed in a standard way. The results lead to a proposition of a lossless compression method of sea-bottom data.
  • Medyna, Piotr; Chomski, Jarosław; Wiśniewski, Bernard (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    A route estimation indicator as a tool for ship route evaluation aimed at avoiding a tropical cyclone is proposed. The time of voyage, navigational indicator and time of ship presence in the cyclone vicinity included in this indicator are taken into consideration.
  • Mięsikowski, Mariusz; Praczyk, Tomasz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Research connected with the application of radar and artificial intelligence techniques to fix ship position has led to the use of the same tools to estimate radar position of a moving object. The paper presents two basic methods which enable enhancement of the radar position of a tracked object.
  • Montewka, Jakub; Przywarty, Marcin (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents mathematical modeling for the positioning of the ship’s hull and determination of the ship’s path width. The above are achieved by two non-simultaneous measurements with a pulsed laser rangefinder. The investigated area is the entrance to the port of Świnoujście.
  • Narkiewicz, Janusz; Andrzejczak, Mariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The capability of predicting ship’s position and course in the near future is a new function of modern integrated navigation systems. Position prediction is usually based on a kinematical model and so it does not include the present vessel conditions. In the new system herein presented the prediction of the ship position in the nearest future is based on the dynamical model of ship movement. The system was validated using data from sea-trials. The results of validation show effectiveness of the developed method.
  • Nowak, Aleksander; Wąż, Mariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper describes problems connected with navigation satellite systems accuracy in urban areas. We considered the influence of reflected signals and changes of space segment geometry caused by radio shadow effect. All analyzed data were obtained thanks to authors’ simulation software
  • Pietrzykowski, Zbigniew (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The human factor should be taken into consideration to enhance the effectiveness and rationality of the operation of navigator decision support systems in the process of sea-going ship management, including the ship movement control. Increasingly more attention is focused on analyses of navigator’s behaviour and problems of the modelling of decision-making processes in ship movement control. This article deals with models of navigator decision processes. The models are based on an analysis of real decision processes and research into the acquisition, representation and application of navigators’ knowledge.
  • Szłapczyński, Rafał (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper introduces a new measure of collision risk, derived from the concept of ship domain. The presented measure is flexible enough to be applied in combination with any given ship domain. Derivations of all the necessary equations for the Fuji domain have been presented in detail. Additionally, the paper contains numerical algorithms that are capable of determining the value of the measure for any other ship domain.
  • Zaikov, Vladimir I.; Hajduk, Jerzy; Kuznetsova, Tatiana Y. (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents assumptions concering estimation of the safety of navigation under a bridge over the river. Taking into account these assumptions, the simulation of the river push train movement has been carried out using MMSIM computer softweare. The described method can be used for determining ship's swept path in various hydro-meteorological conditions and for designing the type of a bridge to be built and the position of piers providing for an accepted level of navigational.
  • Zalewski, Paweł (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Algorithms, which are the results of author’s research, enable the determination of ship’s waterline contour position as well as statistical analysis of its accuracy by means of two GNSS receivers with their antennas located at specific hull’s points. The choice of receivers and measurement techniques were preceded by an analysis of positioning system accuracy, range and availability in the research area.
  • Załęska-Fornal, Agata; Zellma, Marek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The authors present some possibilities of applying quadratic trigonometric splines to determine the bivariate regression function by means of the maximum likelihood method.
  • Załęska-Fornal, Agata; Zellma, Marek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper deals with possible applications of quadratic trigonometric splines for the determination of the regression function by means of the maximum likelihood method. The elaboreted algorithm is used to describe the deviation of magnetic compass on the basis of digital measurements of the heading during the circulation of the vessel with constant rate of turn.

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