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Wyszukujesz frazę "manoeuvrability" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of artificial neural networks to assessment of ship manoeuvrability qualities
    Autorzy:
    Abramowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258896.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    neural networks
    ship manoeuvrability qualities
    Opis:
    This paper presents an attempt to applying neural networks for assessment of parameters of standard manoeuvrability tests, i.e. circulation test and zig-zag test. Methodological approach to application of neural networks as well as applied network structures and neuron activation functions are generally presented. Also, results of simulations performed by means of the elaborated networks are given in comparison with test cases selected at random. In order to analyze and reveal general trends, correlation relationships between results from network simulations and test cases were calculated and are presented as well.
    Źródło:
    Polish Maritime Research; 2008, 2; 15-21
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wind effect simulation system in model tests of ship manoeuvrability
    Autorzy:
    Bednarek, A.
    Jóźwiak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/258700.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship manoeuvrability
    wind
    wind effect simulation
    Opis:
    Dependence on hydro-meteorological conditions in the test area is an “Achilles’ heel” of physical experiment used for assessment of ship manoeuvrability. Aerodynamic forces and moments generated on the ship upperworks distort significantly the measured values. The paper presents new testing tool in the form of physical simulation of wind effect enabling quantitative evaluation of distortion of the measurement results. Another feature of the system enabling compensation of real atmospheric conditions prevailing during the experiment is also presented. The wind effects simulation arrangement includes board data acquisition and processing system, automatic control system and executive system consisting of industrial fans.
    Źródło:
    Polish Maritime Research; 2007, S 2; 64-67
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model tests of the resistance, propulsion and manoeuvrability of ships in the Experimental Centre in Ilawa
    Autorzy:
    Welnicki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/260211.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    resistance
    propulsion
    manoeuvrability
    ships
    Opis:
    Paper presents the development of resistance, propulsion and steering quality model tests carried out on lake. Such pioneering investigations began in 1956 and were gradually improved and extended. Original equipment and measurement methods were developed. The paper presents those research methods and techniques,and also accuracy of the results, in a historical perspective. Described are also several most important research programmes accomplished in the Centre.
    Źródło:
    Polish Maritime Research; 2007, S 2; 8-12
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of hydrodynamic coefficients from results of real ship sea trials
    Autorzy:
    Kim, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/260199.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship manoeuvrability
    system identification method
    hydrodynamic coefficients
    sea trials
    mathematical optimization
    Opis:
    This paper suggests an estimation method for ship’s hydrodynamic coefficients, which is based on the system identification method that calculates an optimum value in a mathematical way. For the purpose of modelling existing ships, this study collects real ship sea trial data as benchmarks. Prior to the optimization, a sensitivity analysis is carried out for easy and effective optimization. The simulation results using optimized coefficients agree well with corresponding benchmarks. Following this, with various trim and draught conditions, this study suggests new estimation formulas that concern all trim and draught conditions. Simulation results applying the estimation formulas are satisfactory in regard to a corresponding benchmark, compared to a result obtained by using an existing regression formula.
    Źródło:
    Polish Maritime Research; 2018, 4; 65-72
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method for a preliminary definition of a high–performance rudder for tuna purse seiners
    Autorzy:
    Martínez–López, A.
    Munín–Doce, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/259135.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rudder optimisation
    vessel manoeuvrability
    tuna vessel design
    Opis:
    The aim of this paper is to provide a simple method for the definition of a rudder for tuna purse seiners. The model achieved by the application of this method ensures the manoeuvrability of initial turning, course keeping and yaw checking. For this, the results obtained by other authors, through rudder tests and manoeuvrability tests of fishing vessels have been integrated with the recommendations of the International Normative. Finally, in the paper the method is applied to the case of a tuna vessel, providing a rudder model which could be optimised with CFD (Computer Fluid Dynamics) in further tests. The method proposed can be applied to other vessels whose main dimensions are met.
    Źródło:
    Polish Maritime Research; 2012, 3; 26-35
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Devices improving the manoeuvrability characteristics of ships. Part I. Laboratory tests on models in cavitation tunnel and towing tank
    Autorzy:
    Doerffer, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/963461.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    opening balbous bow
    opening rudder
    stern shield
    steering braking device
    braking the ship
    Opis:
    An account of research activities on the devices improving the manoeuvring abilities carried out at the Gdansk University of Technology is reviewed. These devices could be placed on the bulbous bow (opening bulbous bow) and at the stern end (wake pressure equalising device, stern shield, opening rudder). Researches with segments of models of these devices in a cavitation tunnel and on self propelled models of ships in a towing tank were performed as well as on open lakes.
    Źródło:
    Polish Maritime Research; 2007, S 1; 81-87
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Devices improving the manoeuvrability characteristics of ships. Part II. ”Doerffer’s Rudder” – experience learnt from tests carried out on real ships
    Autorzy:
    Doerffer, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/963470.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    results of tests with Doerffer's Rudder
    opening rudder
    opening balbous bow
    stern shield
    steering braking device
    braking the ship
    Opis:
    An account of research activities on the devices improving the manoeuvring abilities carried out at the Gdansk University of Technology were presented in Part I of the paper. Experience from implementation of open rudders on real ships is presented in Part II. Open rudders were fitted on two full size ships: a 1000 BHP harbour tug and a 2500 BHP long line fishing vessel. Designs were made for four types of ships: motor sailing passenger ship “Gwarek” (2 x 1.032 BHP and 1800 m˛ sail area); arctic expedition sailing ship m/y “Polarex” (length 40,4 m, 1200 BHP); rescue vessel R-27 (two engines a 600 BHP with single propeller); harbour tug m/t “Atlas” (2500 BHP). None of these designs was implemented due to financial difficulties of the owners. Further model experiments with a self propelled model of a cargo liner m/s “Hollandia” exceeding 20 knots were carried out on the lake as well as with a model of a twin screw vessel.
    Źródło:
    Polish Maritime Research; 2007, S 1; 88-92
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of asymmetric twin-rudder load behaviour through free-running model tests
    Autorzy:
    Efremov, Dobrin
    Milanov, Evgeni
    Powiązania:
    https://bibliotekanauki.pl/articles/34616103.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    manoeuvrability
    twin screw–twin rudder ship
    rudder
    resistance
    rudder normal force
    interactions
    Opis:
    During tight manoeuvres, twin-screw ships equipped with two rudders located in the propeller slip stream experience a fairly large imbalance in the hydrodynamic loads on the propeller and rudders. To investigate the phenomenon of rudder asymmetric load in some depth, manoeuvring experiments based on a free-running model were set up in which the kinematics of the model, the forces on the rudder and the stock moment were recorded. In parallel, with the aim of obtaining an exact estimation of free-stream characteristics of the rudder blade, corresponding wind tunnel experiments were also performed. Based on the results of this investigation, an analysis of the interaction effects within the hull-propeller-rudder system was performed and some conclusions were drawn.
    Źródło:
    Polish Maritime Research; 2023, 3; 4-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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