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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hydrodynamics of DARPA SUBOFF submarine at shallowly immersion conditions
    Autorzy:
    Efremov, D. V.
    Milanov, E. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/115979.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    hydrodynamics
    froude number
    Defense Advanced Research Projects Agency (DARPA)
    submarine
    submarine model
    suboff model
    shallowly immersion conditions
    submarine simulation model
    Opis:
    Recently, the submarine missions are often evolving into operating to littoral areas, which require operating in shallow water. Such shallow water operations strongly contrast with the traditional ones due to the effect of a close to free water surface expressed mainly by surface suction force. This influence is particularly important for submarine maneuverability accounting for restricted area available. The prediction of submarine behavior in similar conditions requires adequate mathematical model and understanding of the additional hydrodynamic load generated near the surface region. The paper is aimed for better understanding of these issues and relating to development of a submarine simulation model, the experimental program of towing and PMM captive tests of DARPA Suboff submarine model were conducted at a towing tank. The influence of phenomenon such as effect of a close to free surface and Froude number at hydrodynamic forces and moments including control surfaces effectiveness were investigated and also was estimated directional stability of motion in horizontal plane.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 337-342
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of factors contributing to the risks of accident
    Autorzy:
    Prayogo, D.
    Ndori, A.
    Andromeda, V. D.
    Kurnianing Sari, D.
    Hartoyo, H.
    Sulistiyowati, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086299.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    safety at sea
    safety training
    risks of accdent
    research and development
    questionnaire method
    CIPP model
    basic safety training
    Opis:
    The study is research and development by utilizing the ex post facto approach. The research area is at the KM. Gunung Dempo. The research information was collected using a questionnaire method and then analyzed using evaluative analysis techniques via descriptive-quantitative analysis. This study is evaluative research with N-Gain. The data were collected through questionnaires and interviews. Valid data in the validity test results can be used for research. Two items of data were found to be invalid during the validity test. Result of N-Gain was 0.766 which was in high category, meaning that implementation of system model changed into suitable and powerful to enhance understanding. Result of t-test showed that t for statistical test was 93.398 with significance level = 0.000 (p<0.05), meaning that the model was effective. Drill Program implemented is in a good category. Correlation coefficient of pre-test and post-test was 0.878. Result of N-Gain was 0.766 which was in high category, meaning that implementation of Training application system version turned into top and powerful to enhance learning. Result of t-test showed that t for statistical test was 93.398 with significance level = 0.000 (p<0.05), meaning that the model was effective.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 33--37
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of Interaction of Water and Tank’s Structure in Sloshing Phenomenon
    Autorzy:
    Krata, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/117117.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Safety and Security in Sea Transportation
    Sloshing Phenomenon
    Water Tank
    Model of Interaction
    Experimental Research
    Numerical Simulation
    Equations of Ship's Movement
    Heeling Moment Calculations
    Opis:
    The paper presents the model of interaction between ship’s tank structure and water contained in the tank. The experimental investigation of sloshing loads in ships’ tank is characterized and the need for description of mutual influence is underlined. The model of interaction is made up for rectangular ship’s tanks and it is assumed to be in time-domain and nonlinear. The solution is based on the data obtained by the experimental research and numerical simulation. The study may be the contribution to more sophisticated estimation of ship’s stability than it takes place nowadays.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 4; 389-395
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The H2 and Robust Hinf Regulators Applied to Multivariable Ship Steering
    Autorzy:
    Gierusz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/116961.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Dynamic Ship Positioning (DSP)
    Multivariable Ship Steering
    Ship Steering
    Multivariable Regulators
    Simulation Model
    Open-Loop System
    Ship Handling Research and Training Centre at Ilawa
    Polska
    Manoeuvring
    Opis:
    The main goal of this task was a calculation of the two multivariable regulators for precise steering of a real, floating, training ship. The first one minimized the H2 norm of the closed-loop system. The second one was related to the Hinf norm. The robust control approach was applied in this controller with the usage of the structured singular value concept. Both controllers are described in the first part of the paper. Details of the training vessel and its simulation model then are presented. The state model of the control object obtained via identification process is described in the next section. This model with matrices weighting functions was the base for creation of ’the augmented state model’ for the open-loop system. The calculation results of the multivariable controllers is also shown in this section. Several simulations were performed in order to verify the control quality of both regulators. Exemplary results are presented at the end of this paper together with final remarks.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 4; 431-440
    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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