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Browsing by Title: 02 Scientific Journals of the Maritime University of Szczecin

  • Artyszuk, Jarosław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The existing regression models on the bank (wall) effect are compared to one an-other both dynamically (force level) and kinematically (counteracting helm and hull drift attitude during a steady-state passage along a bank). A small chemical tanker of known hull and rudder hydrodynamics is used as an example of computations. A lot of essential qualitative and quantitative discrepancies have been found, which might claim the re-gression models of little use in an adequate bank effect simulation. Further research is required in this field.
  • (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Table of content
  • Abramowicz-Gerigk, Teresa (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents the state of art on three dimensional transient flows induced by a ship approaching a berthing structure. The results of full scale measurements of the velocity field obtained during the trials conducted in Gdynia Port with the motor ship “Horyzont II” are given. At the present stage of research the results of measurements have been used for the qualitative assessment of phenomena and making preliminary conclusions regarding the hydrodynamic forces.
  • Abramowski, Tomasz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article presents an attempt at numerical wake determination of a ship moving with drift. For the calculation of viscous flow a numerical method based on the solving of RANS equations has been applied. A bulk carrier hull has been chosen for the analy-sis. The results show complex features of the flow in the stern area. Distributions of wake factor are strongly non-uniform both in radial and circumferential directions and the non-uniformity gets stronger as drift angle increases.
  • Artyszuk, Jarosław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Restricted water effects upon ship manoeuvring are investigated from the full-scale based identification viewpoint. As the resistance increase may be quite accurately corre-lated with the squat, it is proposed to store in the ship manoeuvring model kernel only data on the ship's squat. The problem of correction factors (multipliers) to be imposed upon ship added masses and hull force coefficients is raised. Different patterns (combi-nations) of the multipliers are simulated to show the most representative ship behaviour with regard to turning and zigzag manoeuvres.
  • Bojarowski, Krzysztof (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The results of repeated surveys were used to visualize and evaluate shifts and alter-ation of the configuration of surface objects. The ArcView system with Spatial Analyses and 3D Analyses aplications was adopted as the elaboration platform. The presented examples have served to demonstrate some of the new facilities created by the applica-tion of spatial information systems in deformation analyses.
  • Cepowski, Tomasz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents a method for the stability assessment taking into account ship behavior in waves. The m the method aims at examining ship seakeeping ability by the numerical sea test simulation in real-life operation scenarios. The article presents an application of the method for seakeeping analysis which served as a basis for stability criterion formulation.
  • Duda, Jarosław; Borawski, Mariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper describes a research concerning possible applications of orthogonal ba-ses for the recognition of changes between various forms on the seabed recorded as sonar images. The distribution of changes in seabed forms is characteristic of any place. Therefore, they can be associated with geographical co-ordinates, which can be used for determining ship position in comparative navigation.
  • Dzikowski, Remigiusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper contains a mathematical description of non-conventional methods of ad-justing a magnetic compass. The advantages and disadvantages of new methods have been discussedon the basis of the simulalation.
  • Filipowicz, Włodzimierz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Separation schemes along with Vessel Traffic Services have improved the safety of navigation, particularly within restricted waters. Their role is rather passive and com-mon sense is still required whenever a decision is to be made. It is assumed that it could be beneficial in terms of collision or accident risk reduction once active measures are introduced. The concept raises a wide variety of problems that are to be discussed, de-fined and solved.
  • Galor, Wiesław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The under-keel clearance of a ship manoeuvring in a port water area should pro-vide for safe ship movement. The results of undesired ship impact into the channel ground can damage the ship hull. There is a need to prepare a scientific method of speci-fying the minimum under-keel clearance such that the safety of a manoeuvring ship will be maintained. The article presents guidelines for of the model enabling the estimation of ship impact into the bottom.
  • Gościewski, Dariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Digital terrain models are often generated on the basis of data recorded automati-cally. If such sets are to be processed, the measured quantities must be ordered and represented as a GRID or TIN structure. Terrain model accuracy depends on establish-ing appropriate processing criteria and proper selection of design parameters of a given structure. The effects of measuring points distribution on the selection of design parame-ters of a regular square grid for the purpose of generating a digital bottom model have been analysed in the paper.
  • Gucma, Lucjan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents a concept of probabilistic and risk-based decision support mod-el for large ships admittance to ports. Two main accident types are included into the model: accidents due to ships exceeding horizontal boundaries of manoeuvring area and accidents due to ship hitting the bottom because of failing to maintain the safe under-keel clearance.
  • Gucma, Maciej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Vessel maneuvering in restricted areas requires expert knowledge (usually that of a pilot who is a specialist in a given area). To minimize the influence of shipboard equipment on pilot decisions, it is proposed to create a pilot navigational system (PNS). One of the PNS components is an electronic compass. The article looks into se-lected compass technologies. The accuracy of AMR (anisotropy magnetoresistive tech-nology) electronic compass has been assessed.
  • Gucma, Stanisław (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article deals with local coordinate systems used in navigation in restricted areas. Typical examples of such systems are shown.

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