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    Wyświetlanie 1-7 z 7
    Tytuł:
    Szacowanie okresu kołysań własnych statków kontenerowych : porównanie metody uproszczonej z wynikami badań symulacyjnych
    Estimation of free rolling period for container vessels : comparison of IMO-recommended method with numerical simulation results
    Autorzy:
    Krata, P.
    Wawrzyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/316820.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    kontenerowiec
    kołysanie statków
    kołysanie boczne
    IMO
    symulacja numeryczna
    container vessel
    rolling
    ship rolling
    numerical simulation
    Opis:
    Artykuł przedstawia porównanie wartości okresu kołysań swobodnych statku wyznaczonego na podstawie wzorów uproszczonych zalecanych przez IMO w Kodeksie Stateczności Statku Nieuszkodzonego oraz uzyskanych w toku przeprowadzonych symulacji numerycznych. Do wykonania analizy wykorzystano dane trzech statków kontenerowych różnej wielkości i różnej generacji. Przyjęto po cztery typowe stany załadowania dla każdego ze statków. Wyniki porównania zestawiono na wykresach okresu kołysań w funkcji amplitudy dla szerokiego zakresu amplitud kołysania bocznego.
    The paper deals with the matter of estimation of ship’s free rolling period. The comparison of calculations based on the IMO-recommended method versus numerical simulations is presented. The particulars of three container vessels of different sizes and generation were used to perform simulations of their free rolling. Four typical loading conditions of each ship were taken into account. The results of comparison are presented in the form of plots presenting obtained rolling periods versus rolling amplitude for a wide range of such amplitude of ship rolling.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 4; 72-77
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classification of parametric rolling for seagoing ships and percentage distribution for multiple sea state parameters
    Autorzy:
    Chhoeung, S.
    Hahn, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201396.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    seagoing ship
    rolling
    sea state
    sea state parameters
    multiple sea state parameters
    MARIN
    parametric rolling
    Artificial Intelligence
    Opis:
    In this paper, parametric rolling is divided into 5 heavy grades, establishing a classification for parametric rolling. This is achieved by a multi-parameter application in the simulations. For this purpose, parametric rolling, established criteria and the state of the art are considered and the results are summarized. Based on this, parametric rolling is successfully simulated using discrete simulation in MARIN [1]. Five heavy grades are introduced so different classes of parametric rolling can be distinguished. Furthermore, dependencies and probabilities for the occurrence of parametric roles in relation to the see are determined numerically. This will later be used in an assistance system on board ships to compute the prediction of parametric roll using an AI.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 4; 769--777
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of optimum hull form for passenger car ferry with regard to its sea-keeping qualities and additional resistance in waves
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258898.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea-keeping qualities
    roll-on/roll-off ferry ship
    rolling
    transverse accelerations
    vertical accelerations
    motion sickness index
    additional resistance in waves
    ship hull form
    ship design parameters
    artificial neural networks
    fuzzy logic
    Opis:
    This paper presents a method which makes it possible to determine optimum hull form of passenger car ferry with regard to selected sea-keeping qualities and additional resistance in waves. In the first phase of investigations a hull form characterized by the highest qualities was selected from the list of similar ships. Next, its optimum dimension ratios were determined. Design criteria were formulated by using a method based on deterministic scenarios, but objective functions of partial targets were determined in the form of artificial neural networks. To select the best design variants elements of fuzzy logic were used, that made it possible a.o. to show merits of the design by means of linguistic variables. Such approach made it possible to find the best hull form and its dimensions from the point of view of all considered criteria simultaneously.
    Źródło:
    Polish Maritime Research; 2008, 2; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seakeeping software for the analysis of a ship’s seaworthiness
    Autorzy:
    Cepowska, Ż.
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/135338.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    seakeeping
    seaworthiness
    design
    ship
    naval architecture
    artificial neural networks
    motions
    rolling
    slamming
    pitching
    heaving
    acceleration
    green water
    software
    Opis:
    The article presents the Seakeeping research software, developed for the computation of a ship’s motions in regular and irregular waves on the basis of the following ship parameters: length between perpendiculars, beam, draught, block coefficient and transverse initial metacentric height. The software implements approximating functions of amplitude-phase characteristics of rolling, heaving, and pitching, developed by the author by means of artificial neural networks. The software determines transfer functions for the phenomena accompanying the rolling motion, such as slamming, green water, propeller surfacing, vertical acceleration forward and on the bridge. The article discusses possible uses of the software in scientific research, ship design and operation, and for educational purposes.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 42 (114); 95-100
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximation of the index for assessing ship sea-keeping performance on the basis of ship design parameters
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259570.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea-keeping qualities
    sea-keeping performance index
    approximation
    ship design parameters
    artificial neural networks
    rolling
    slamming
    green-water shipping
    Opis:
    This paper presents a new approach which makes it possible to take into account seakeeping qualities of ship in the preliminary stage of its design. The presented concept is based on representing ship’s behaviour in waves by means of the so called operational effectiveness index. Presented values of the index were calculated for a broad range of design parameters. On this basis were elaborated analytical functions which approximate the index depending on ship design parameters. Also, example approximations of the index calculated by using artificial neural networks, are attached. The presented approach may find application to ship preliminary design problems as well as in ship service stage to assess sea-keeping performance of a ship before its departure to sea.
    Źródło:
    Polish Maritime Research; 2007, 3; 21-26
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence analysis of changes of design parameters of passenger-car ferries on their selected sea-keeping qualities
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259447.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    passenger-car ferry
    design guidelines
    preliminary design stage
    sea-keeping qualities
    rolling
    sea-sickness (motion-sickness) index
    vertical accelerations
    ateral accelerations
    ship main dimensions
    Opis:
    The main scientific aim of this research was to elaborate design guidelines which could make it possible to improve sea-keeping qualities of passenger-car ferries. The searchedfor design guidelines were prepared in the form of regression functions as well as artificial neural networks on the basis of the results obtained from calculations with the use of numerical methods based on the theory of planar flow around a body. The guidelines make it possible to predict ship roll, sea-sickness index, lateral and vertical accelerations on the basis of quantities available in the preliminary stage of ship design.
    Źródło:
    Polish Maritime Research; 2010, 1; 25-32
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the modeling of car passenger ferryship design parameters with respect to selected sea-keeping qualities and additional resistance in waves
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258828.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea-keeping qualities
    roll-on/roll-off ferryship
    rolling
    motion sickness index
    lateral accelerations
    additional resistance in waves
    ship design parameters
    modeling
    artificial neural networks
    optimization
    Pareto method
    Opis:
    This paper presents the modeling of car passenger ferryship design parameters with respect to such design criteria as selected sea-keeping qualities and additional resistance in waves. In the first part of the investigations approximations of selected statistical parameters of design criteria of ferryship were elaborated with respect to ship design parameters. The approximation functions were obtained with the use of artificial neural networks. In the second part of the investigations design solutions were searched for by applying the singleand multi-criterial optimization methods. The multi-criterial optimization was performed by using Pareto method. Such approach made it possible to present solutions in such form as to allow decision makers (shipowner, designer) to select solutions the most favourable in each individual case.
    Źródło:
    Polish Maritime Research; 2009, 3; 3-10
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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