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    Wyświetlanie 1-4 z 4
    Tytuł:
    Research on ship hull optimisation of high-speed ship based on viscous flow/potential flow theory
    Autorzy:
    Zhang, Baoji
    Powiązania:
    https://bibliotekanauki.pl/articles/259772.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    potential flow theory
    CFD
    high speed ship
    ship form optimisation
    Opis:
    In order to quickly obtain practical ship forms with good resistance performance, based on the linear wave-making resistance theory, the optimal design method of ship forms with minimum total resistance is discussed by using the non-linear programming (NLP) method. Taking the total resistance as the objective function (the Michell integral is used to calculate the wave-making resistance and the equivalent plate friction resistance formula is used to calculate the frictional resistance), the hull surface offset as the design variable and appropriate displacement as the basic constraints, and considering the additional constraints, the hull bow shape and the whole ship are optimised, and an improved hull form is obtained. The resistance of the ship before and after optimisation is calculated by the CFD method to further evaluate the resistance reduction effect and performance after optimisation. Finally, an example of optimisation calculation of an actual high-speed ship is given. The obvious resistance reduction results confirm the reliability of the optimisation design method.
    Źródło:
    Polish Maritime Research; 2020, 1; 18-28
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model tests in open waters – a concept that did pay off
    Autorzy:
    Kobyliński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259970.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    high-speed craft
    ship model tests
    ship hydrodynamics
    development of ship hydrodynamics science in Poland
    Opis:
    The paper presents the concept of performing model tests in open waters. This concept was realized in the Ilawa Experimental Station arranged on the shore of the Jeziorak Lake in 1956. Since then model tests of high-speed craft, manoeuvrability and propulsion characteristics of conventional seagoing ships and inland waterways push tugs-barges systems have been performed there. New concepts of how to perform the tests were developed. The advantages of performing model tests in open waters were stressed and future possible applications suggested. The activity of the experimental station that belonged to the Technical University of Gdańsk greatly contributed to.
    Źródło:
    Polish Maritime Research; 2007, S 2; 20-24
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the Efficiency of a High Speed Catamaran Through the Replacement of the Propulsion System
    Autorzy:
    Melo, G.
    Echevarrieta, I.
    Serra, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116469.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Propulsion
    Propulsion System
    High Speed Catamaran
    High Speed Craft (HSC)
    MARPOL Annex VI
    Energy Efficiency Operational Index (EEOI)
    Marine Gas Oil (MGO)
    Improving the Efficiency
    Opis:
    The high speed vessels are primarily designed for short distances services as public transport of passengers and vehicles. The range of high speed, according to the Code of high-speed vessels begins at 20 knots, which depends on the cruise speed you desire for your vessel; you will have to use the most appropriate type of propellant. In general, in the past 20 years, they have been building high-speed vessels with speeds above 33 knots, which meant installing water jet propellants coupled to powerful engines and therefore of high consumption of fuel, increasing operating costs and causing increased air pollution. Although the prices of fuel have been reduced to half, due to the sharp fall in oil prices, the consumption of fuel and the air pollution remains high at these speeds and powers used, in addition to that the reduction of the time spent on each trip is not excessive, mainly in short routes that are less than an hour . This article is about adapting a ship of high-speed service, with a maximum speed in tests of 34 knots and to reduce its operating costs (fuel, maintenance, etc.) and make it economically viable; before the transformation, this vessel was operating with a service speed of 22 knots, and with a consumption per mile of 135 litters of MGO. The transformation process has consisted by: – Replacement of the two original water jet with four shaft lines with fix pitch propeller. – Replacement of the two original main engines (2 x 6500 kW = 13000 kW) by four engines (4 x 1380kW = 5.520 kW). – Changing the underwater hull shape to fit the new propellers and maximize its efficiency. – Relocation of auxiliary engines, to achieve the most efficient trim. – Installation of two lateral propellers to improve maneuverability and shorten the total time of journey. After the reform and the return to service of the vessel with a service speed of over 22 knots, it has been verified that the consumption per mile is of 45 litters MGO, representing a reduction of 65% of consumption and even more reduction of emissions as the new engines comply with the latest regulations.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 531-535
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scan pattern for the maritime navigator
    Autorzy:
    Hareide, O.S.
    Ostnes, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/117578.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    integrated navigation
    High Speed Craft (HSC)
    maritime navigator
    Integrated Navigation System (INS)
    littoral combat ship
    scan pattern
    Multi-Function Display (MFD)
    electronic navigation
    Opis:
    The maritime high speed craft navigators` ultimate aim has for decades been to safely and efficient navigate the vessel to its destination. The last decade an increased use of technology has arrived at the maritime ship bridge. The use of Electronic Charts and Integrated Navigation Systems has revolutionized much of the work of the navigator, with the aim of enhancing the safety of navigation. The amount of information has drastically increased, and the need for a proper information management and an efficient visual scan pattern has been identified. Looking to other industries this has been introduced with success, and in this paper the authors present a proposed scan pattern for the maritime navigator. The analysis is based on an eye tracking data set collected from simulator- and field studies on board the world’s fastest littoral combat ship.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 39-47
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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