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    Wyświetlanie 1-11 z 11
    Tytuł:
    The current and future possibilities to adapt the R-JH3 method to ship power prediction practice
    Autorzy:
    Jarzyna, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259176.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship hydromechanics
    theory of propellers
    ship hull-propeller interaction
    Opis:
    In the paper the current and future possibilities of the R-JH3 method are discussed. The R-JH3 method (presented in detail in [27]) was elaborated for the ship power prediction on the basis of a new definition of the open-water propeller fully equivalent to the behind-the--hullpropeller. The R-JH3 method can be used to determine the mean effective velocity and the mean effective pitch coefficient of the behind propeller. The R-JH3 method may be very useful for scale-effect investigations and scale-effect designation when results of model self-propulsion test have to be transformed to the ship scale.
    Źródło:
    Polish Maritime Research; 2005, 1; 3-7
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of influence of screw propeller operation on water flow around stern part of ship hull
    Autorzy:
    Koronowicz, T.
    Krzemianowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260348.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship hydromechanics
    propeller-induced velocities
    Biot-Savart equation
    Opis:
    This paper presents results of measurements of velocity field in before- the - propeller flow in presence of a ship model hull of two configurations, as well as comparative calculations of velocity field on a full-scale ship. Analysis of the research results showed that input data to Biot-Savart formula should be modified in the case of calculations of propeller-induced velocities on ship hull surface.
    Źródło:
    Polish Maritime Research; 2007, 1; 3-8
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Roll response of ship fitted with passive stabilizing tank
    Autorzy:
    Balcer, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259377.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    seaworthiness
    ship safety
    ship hydromechanics
    stability of floating units
    Opis:
    Physical and mathematical models of roll motions of a ship equipped with a roll stabiliŹzing tank of working liquid free surface, is presented. Elaboration of the physical model was based on the idea of two mutually coupled mathematical pendulae. On the basis of the physical model, motion equations of the ship with the tank were determined and solŹved. A way of using the achieved solutions is shown, as well as calculation formulae for coefficients of the motion equations, directly related to the main parameters of the ship and tank, are presented. Such form of the coefficients enhances possibility of application of the equations and their solutions in ship design practice. Some examples of the use of the solutions for analysis of stabilizing effectiveness of a designed tank for a given ship, are also attached. Moreover, guideŹlines for correct design of the stabilizing tanks having free surface of liquid, based on the proposed physical model of the ship-tank system, are offered. It is also indicated that on the basis of the presented results it would be possible to search for ways to make operation of the stabilizing tanks in question more effective.
    Źródło:
    Polish Maritime Research; 2004, 3; 12-20
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Location of ship rolling axis
    Autorzy:
    Balcer, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259294.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship seaworthiness
    ship safety
    ship hydromechanics
    stability of floating units
    Opis:
    In the paper is presented a definition of ship rolling axis and a method for determination of location of the axis. Location of rolling axis depends not only on ship mass distribution but also on the so-called "added masses" which are equivalents of the hydrodynamic forces acting on ship hull during its motion. It has been assumed that the rolling axis is fixed with respect to ship's hull, and its location is determined with accounting for the added masses accompanying ship rolling, whereas the influence of damping forces is neglected. For a representative group of ships appropriate coefficients of hydrodynamic forces were calculated on the basis of the experimental test results available in the subject-matter literatuŹre. It has been assumed that the rolling axis passes through a common centre of ship's mass and relevant added masses. As a result proposed are simple approximate formulas which make it possible to calculate location of ship rolling axis on the basis of the typical ship data available at the preliminary design stage.
    Źródło:
    Polish Maritime Research; 2004, 1; 3-7
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Some Stealth Features for a Small Navy Ship at the Concept Design Stage
    Autorzy:
    Formela, Natalia
    Gerigk, Mirosław Kazimierz
    Powiązania:
    https://bibliotekanauki.pl/articles/503936.pdf
    Data publikacji:
    2014
    Wydawca:
    Międzynarodowa Wyższa Szkoła Logistyki i Transportu
    Tematy:
    small navy ship
    stealth technology
    ship hydromechanics
    ship performance
    risk assessment
    Opis:
    In this paper the basic research problems associated with modelling the basic stealth features for a small navy ship at the concept design stage are introduced. Amongst the major stealth features considered are: the modification of the immersed ship hull form by a rapid change of the ship loading condition, and modification of the ship boundary layer by the hull skin cover. The other stealth features of the ship are not presented in this paper as they do not refer to the ship hydromechanics. The research method is based on the navy ship risk assessment and assessment of the ship performance. The risk may be estimated according to a proposed risk model. The risk assessment may be done according to the risk matrix criteria. The ship performance assessment is based on modification of the immersed ship hull form and modification of the ship boundary layer. Some elements of the research method and mathematical model for estimating the ship performance are introduced in the paper. In general, the research is associated with the interdisciplinary investigations and multi-criteria ship design. The problems presented in the paper follow the Ph.D. research conducted at the Faculty of Ocean Engineering and Ship Technology at Gdańsk University of Technology.
    Źródło:
    Logistics and Transport; 2014, 24, 4; 21-30
    1734-2015
    Pojawia się w:
    Logistics and Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On a risk-based method for safety assessment of a ship in critical conditions a the preliminary design stage. Current report
    Autorzy:
    Gerigk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259455.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship safety
    formal safety assessment
    design for safety
    ship hydromechanics
    survivability
    Opis:
    The paper presents some current results of the research on development of a method for safety assessment of ships in critical conditions at the preliminary design stage. The meŹthod is expected to make it possible to perform the multi-objective and multi-parametric investigations to achieve the required and optimum levels of safety by using the risk-based and formal approaches to ship safety. During the design analysis influence of parameters associated with the hull form, arrangement of internal spaces, loading conditions, position and extent of damage, cargo shift and weather impacts on safety of ships in critical condiŹtions will be taken into account. Current capabilities of the method are illustrated by several calculation examples of influence of different arrangements of internal spaces of a cargo ship on values of the IMO formal subdivision indices such as the "Attained Subdivision Index A" and "Local Subdivision Indices ?Aj". The method is still under development and its final structure will be presented in the near future.
    Źródło:
    Polish Maritime Research; 2004, 1; 8-13
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Challenges to Ship Hydrodynamics in the XXI Century
    Autorzy:
    Kobyliński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116543.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Hydrodynamics
    World Shipping
    Exploitation of Ocean Resources
    Environment Protection
    Structure of World Fleet
    offshore industry
    Ship Hydromechanics
    Green Ship Concept
    Opis:
    The beginning of twenty-first century is characterized with important changes in world shipping and exploitation of ocean resources. Three important trends are clearly visible: environment protection, safety and economy. They materialize in important changes in the structure of world fleet where some existing ship types are going to disappear and new ship types emerge. Increasing the size of some ship types is another visible tendency. Stress on environment protection has serious impact on the hydrodynamic characteristics of ships whether with regard to safety zero accident rate is the goal. Important challenges to ship hydrodynamics caused by those tendencies are discussed in the paper.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 353-358
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie CFD osiadania statków kontenerowych podczas manewru wymijania na torze wodnym
    CFD modeling of container vessel squat during passing by another ship at shallow waterway
    Autorzy:
    Jachowski, J.
    Krata, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/309590.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    trajektorie statków
    optymalne trajektorie statków
    hydromechanika
    ruch statków
    tor wodny
    nawigacja morska
    unikanie kolizji statków
    symulacja numeryczna
    modelowanie CFD
    ship trajectory
    optimal ship trajectories
    ship hydromechanics
    ship motion
    numerical simulations
    waterways
    marine nawigation
    ship collision avoidance
    CFD modeling
    Opis:
    W artykule omówiono badania nad zastosowaniem zaawansowanych obliczeń numerycznej mechaniki płynów do wyznaczania trajektorii ruchu (w sześciu stopniach swobody) statku morskiego żeglującego na akwenie ograniczonym podczas manewru wymijania z innym statkiem. Uwzględniono jednocześnie zarówno oddziaływanie dna i brzegów kanału o zadanej geometrii jak również oddziaływanie wymijanego statku, co jest podejściem nowatorskim na skalę światową. Wyniki symulacji przeanalizowano pod wzglądem hydrodynamicznego zjawiska osiadania, powstającego podczas przejścia statku przez akwen ograniczony głębokością i brzegami kanału przy jednoczesnej interakcji z wymijanym statkiem. W obliczeniach wykorzystano geometrię typowego statku kontenerowego.
    Paper describes a research into ship’s squat phenomenon which is related to the safe entering of large ships into contemporary existing sea harbors. As the significant research effort in ship hydromechanics is devoted in recent years to the practical navigation problems, the Authors follow this trend and addressed the squat by means of CFD numerical simulations. The analysis of 6 DOF ship motion was performed, including the effects of shallow water, horizontal restrictions, extend of a channel and especially ship squat during passing by maneuver at a waterway. An exemplary case-study is carried out for a large container vessel. The obtained results were experimentally verified by comparison to one German experiment and own models tests. Such complex approach is a novelty worldwide.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 4; 64-71
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waterjet propulsion of small-draught inland waterways ships
    Autorzy:
    Domachowski, Z.
    Próchnicki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/260461.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship propulsion
    hydromechanics
    Opis:
    This paper presents some aspects of ship waterjet propulsion. Advantages and limitations of its applicability are discussed. Also, possible use of waterjet propeller to move a small-draught inland waterways ship, is considered .
    Źródło:
    Polish Maritime Research; 2006, S 2; 66-71
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A proposal of ship gas-turbine driven waterjet propulsion - preliminary considerations
    Autorzy:
    Próchnicki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/962800.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship propulsion
    hydromechanics
    waterjet
    Opis:
    In the paper are presented preliminary considerations concerning the efficiency of waterjet ship propulsion system, as well as the calculation of main dimensions of waterjet channel. The friction and momentum losses of the flow channel have been roughly estimated by using Fliegner s equations. An important conclusion is confirmed that the summary losses are inversely proportional to square of ship velocity (~1/u2). On the other hand the ship propulsion power is directly proportional to third power of ship velocity (~u3). Therefore to minimize ship s hull resistance, hulls of water jet-driven ships ought to be of a great slenderness - e.g. L/B = 15, stabilized by sponsons, or of semi-swath hydrofoil-supported construction.
    Źródło:
    Polish Maritime Research; 2004, S 1; 79-82
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of effectiveness of waterjet propulsor for a small underwater vehicle
    Autorzy:
    Rowinski, Lech
    Kaczmarczyk, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2033211.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship propulsion
    hydromechanics
    waterjet
    underwater vehicle
    Opis:
    The goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located inside the body of the vehicle instead. The general conditio of the application of the new solution was to secure at least the same motion control capabilities of the vehicle while the basic capability is its propulsion effectiveness at the required speed. Specific features of the considered waterjet propulsor, when compared with their application in surface vessel propulsion, are the lack of the head losses and the low significance of cavitation issues. One of the difficulties in the considered case is the small diameter of the propulsor in comparison to commercially available waterjet units, which have diameters between 0.1 [m] and 1.0 [m]. There is very little data regarding the design and performance of devices in the 0.02 to 0.05 [m] range. Methods utilised to forecast the performance of the new propulsion system are presented and results compared. These were semi-empirical calculations, numerical calculations and tests of real devices. The algorithm that is based on semi-empirical calculations is of particular interest while it offers possibility quick assessment of performance of a propulsor composed of several well defined components. The results indicate the feasibility of modification of the propulsion system for the considered vehicle if all the existing circumstances are taken into account.
    Źródło:
    Polish Maritime Research; 2021, 4; 30-41
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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