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    Wyświetlanie 1-5 z 5
    Tytuł:
    Hydrodynamic Analysis of Trimaran Vessels
    Autorzy:
    Javanmardi, M. R.
    Jahanbakhsh, E.
    Seif, M. S.
    Sayyaadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/258654.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    trimaran
    resistance
    maneuvering
    computational fluid dynamics (CFD)
    Opis:
    Trimaran vessels are developed for different applications and hydrodynamic behavior of such vessels is different than usual mono-hulls. In this paper hydrodynamic resistance and maneuvering of a trimaran with Wigley body form are investigated. The effects of outriggers position in four different longitudinal and two transverse locations are studied. For hydrodynamic simulations a CFD code has been developed and used. This code is capable for simulating three dimensional, time dependent, two phases, viscous flow coupled with rigid body motion. Formulation and solution algorithm are described in detail. Different case studies have been performance and numerical results have shown good agreement with experimental data. Based on resistance and maneuvering simulation of the trimaran vessels different conclusion are made. The results show that positions of outriggers have great effect on resistance and maneuverability of trimaran. The present method can be further employed to investigate other hydrodynamic qualities of trimaran vessels.
    Źródło:
    Polish Maritime Research; 2008, 1; 11-18
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propulsion and maneuvering systems’ characteristics of the U.S. flagged great lakes self-unloading bulk carriers
    Autorzy:
    Przybylski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073547.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    vessel propulsion
    vessel maneuvering
    bulk carrier
    Great Lakes bulk carrier
    self-unloader
    Opis:
    Paper contains an overview of the propulsion and maneuvering systems’ characteristics of United States flagged Great Lakes self - unloading bulk carriers. A contrast between the importance of the transport task carried by those vessels to their low number and considerable age suggests the need to review and understand their complexity as well as complexity of their operations in order to provide suitable energy- and operational efficiency upgrades. Such review can prove to be challenging due to limited information available in the literature. Environment in which those vessels operate and their operational profile have been also reviewed due to the fact that they gave rise to the unique hull - form that subsequently influenced the propulsion and maneuvering system design in a significant manner. The environment and operational profile were also found to influence propulsion and maneuvering systems’ form more directly: through the requirements posed on vessels maneuvering capabilities and propulsive power requirements.
    Źródło:
    Journal of Polish CIMEEAC; 2018, 13, 1; 78--88
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship maneuvering prediction using grey box framework via adaptive RM-SVM with minor rudder
    Autorzy:
    Me, Bin
    Sun, Licheng
    Shi, Guoyou
    Liu, Xiaodong
    Powiązania:
    https://bibliotekanauki.pl/articles/259458.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship maneuvering
    reference model
    linear support vector machine
    grey box framework
    similarity rule
    Opis:
    A grey box framework is applied to model ship maneuvering by using a reference model (RM) and a support vector machine (SVM) (RM-SVM). First, the nonlinear characteristics of the target ship are determined using the RM and the similarity rule. Then, the linear SVM adaptively fits the errors between acceleration variables of RM and target ship. Finally, the accelerations of the target ship are predicted using RM and linear SVM. The parameters of the RM are known and conveniently acquired, thus avoiding the modeling process. The SVM has the advantages of fast training, quick simulation, and no overfitting. Testing and validation are conducted using the ship model test data. The test case reveals the practicability of the RF-SVM based modeling method, while the validation cases confirm the generalization ability of the grey box framework.
    Źródło:
    Polish Maritime Research; 2019, 3; 115-127
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of basic parameters of Ro-Pax ferries in the Baltic Sea as guidelines for its preliminary design
    Autorzy:
    Gucma, L.
    Raczkowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259872.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Ro-Pax ferry
    ship design
    ferry traffic
    operating parameters
    maneuvering parameters
    analysis of ship dimensions
    Opis:
    This paper presents results of an analysis of the operating and maneuvering parameters (length, width, draft, main propulsion power and maneuvering equipment, and windage area) of the Ro-Pax ferries over 150m in length. The analysis takes into accounts all ferries operating in the Baltic Sea in 2017. The work also includes route analysis of the collected Ro-Pax units. The influence of port infrastructure is also discussed. The mean optimal Baltic Sea Ro-Pax ferry and its parameters for short term and long term forecasts are presented. This paper may be used as a primary guideline for the determining the optimal Ro-Pax ferry dimensions size for the Baltic lines in terms of preliminary ship design.
    Źródło:
    Polish Maritime Research; 2018, 3; 44-53
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical estimation of hull hydrodynamic derivatives in ship maneuvering prediction
    Autorzy:
    Kołodziej, Radosław
    Hoffmann, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1551776.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    captive model tests
    CFD tools in maneuvering prediction
    MOERI Container ship (KCS)
    Hull hydrodynamic derivatives
    Mathematical model of ship motion
    Opis:
    Prediction of the maneuvering characteristics of a ship at the design stage can be done by means of model tests, computational simulations or a combination of both. Th e model tests can be realized as a direct simulation of the standard maneuvers with the free running model, which gives the most accurate results but is also the least aff ordable, as it requires a very large tank or natural lake, as well as the complex equipment of the model. Alternatively, a captive model test can be used to identify the hydrodynamic characteristics of the hull, which can be used to simulate the standard maneuvers with the use of dedicated soft ware. Two types of captive model tests are distinguished: circular motion tests (CMT) and planar motion mechanism tests (PMM). Th e paper presents an attempt to develop a computational method for ship maneuverability prediction in which the hydrodynamic characteristics of the hull are identifi ed by means of computational fl uid dynamics (CFD). Th e CFD analyses presented here directly simulate the circular motion test. Th e resulting hull characteristics are verifi ed against the available literature data, and the results of the simulations are verifi ed against the results of free running model tests. Reasonable agreement shows the large potential of the proposed method.
    Źródło:
    Polish Maritime Research; 2021, 2; 46-53
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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