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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Present and Expected Changes in Maritime Safety, Security and Defense Functions
    Autorzy:
    Urbański, J.
    Morgas, W.
    Miesikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116661.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Safety of Navigation
    navy
    Maritime Safety
    Maritime Security
    Defense Functions
    Maritime Functions
    Maritime Safety System
    safety at sea
    Opis:
    In this paper, an attempt has been made to present the subject and state of the three main functions of each maritime country; these are: the maritime safety, maritime security and maritime defense functions. There have been also discussed the subjects of these functions as well as the reasons and process of the closest and closest cooperation between these functions, and even the merger of these functions in one maritime function, i.e. in the maritime safety, security and defense functions Especially quickly proceeds the merger of the maritime security and maritime defense functions in one maritime function, i.e. in maritime security and defense function.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 1; 11-17
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of ship airwakes by scale adaptive simulation
    Autorzy:
    Shukla, S.
    Singh, S. N.
    Sinha, S. S.
    Vijayakumar, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116802.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    applications for navy
    ship airwakes
    Scale Adaptive Simulation (SAS)
    simulation
    flow phenomena
    turbulent structures
    investigation by simulation
    ship airwakes flow characteristic
    Opis:
    An early assessment of the ship airwakes flow characteristic is one of the most challenging tasks associated with the designing of vessels. The presence of ship airwake creates very complex flow phenomena due to the presence of strong velocity gradients in space and time and widely varying high levels of recirculation and turbulence. Under such condition, the landing and take-off operation of a helicopter over the ship helodeck is very complex and accurate prediction represents a computational challenge. We present time-accurate scale-adaptive simulation (SAS) of turbulent flow around a simple frigate ship to gain insight into the flow phenomena over the helodeck. Numerical analysis is carried out after several grids and time-steps refinement to ensure the spatial and temporal accuracy of the numerical data. The instantaneous iso-surface of eddy flow structures and vorticity have been analysed across the vertical and longitudinal plane. Results show good agreement with experimental data. Comparisons of mean quantities and velocity spectra show good agreement, indicating that SAS can resolve the large-scale turbulent structures which can adversely impact ship-helo combined operations. Overall, the SAS approach is shown to capture the unsteady flow features of massively separated ship airwake characteristics with reasonable accuracy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 471-475
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ways to improve radiotelephone procedures training for the navy
    Autorzy:
    Nikolov, Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/117195.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    communication
    Global Maritime Distress and Safety System (GMDSS)
    radiotelephone
    radiotelephone procedures
    radiotelephone procedures training
    MET System in Bulgaria
    Bulgarian Naval Academy
    Navy
    Opis:
    Every type of training can be improved. Trying to find ways to do so is a continuous process. The identification and implementation of the most effective of those can only be adequate to the changing environment in case of objective review, comparison and analysis. This paper discusses some approaches whose adoption can lead to the enhancement of the training for radio operators for working in tactical net-works for the Navy. It also shares some experience from the implementation of such methods when training cadets at the Bulgarian Naval Academy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 181-183
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of inline-slot ejector diffuser under varying ambient conditions: A passive infrared suppression device for ships
    Autorzy:
    Singh, L.
    Singh, S. N.
    Sinha, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117455.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    applications for navy
    ejector diffuser
    passive iInfrared suppression device
    InfraRed (IR)
    IR imaging
    IR locking
    Shear Stress Transport (SST)
    Infrared Suppression System (IRSS)
    Opis:
    Passive infrared (IR) suppression device, commonly known as ejector diffuser, is an integral part of the defence system of a ship. The definitive role of passive IR suppressor to counter the IR tracking and locking of the ship has made them indispensable for any combat marine. The gas turbine exhaust gases are the leading heat source on a ship. The exhaust temperature of the gases ranges between 650K-850K. At such temperatures, the ship can be easily detected by the enemy through IR imaging. The role of the ejector diffuser is to (i) lower the gas turbine exhaust gases temperature to the limits (< 450K) such that the IR locking of the marine can be avoided, and (ii) recover static pressure such that the engine performance of the gas turbine is not affected. Ejector diffuser has the ability to entrain ambient air and allow mixing it with the exhaust gases thereby, lowering the temperature of the exhaust gases. However, the mixed exhaust gases temperature depends on the ambient air temperature which under extreme conditions can fluctuate from 273K to 323K. This temperature range can affect the temperature characteristics of an ejector diffuser. The present study undertakes the effect of ambient temperature on the performance of inline-slot ejector diffuser. The ambient temperature (T0) has been varied in the range 273K ≤ T0 ≤ 323K in the step of 10K. It has been found that the mass entrainment increases (≈ 8%) as the ambient temperature decreases. The core temperature at the exit decreases, from 457.58 K to 417.75K, with a decrease in the ambient temperature. However, no significant changes in static pressure recovery.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 477-482
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology for Training in the Use of Radiotelephone Procedures in the Navy
    Autorzy:
    Nikolov, Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/116152.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime safety
    radiotelephone
    radiotelephone procedures
    radiotelephone procedures in the navy
    training in the use of radiotelephone
    Bulgarian Naval Academy
    1-2-3 rule
    Allied Communications Publication (ACP)
    Opis:
    Learning the radiotelephone procedures and rules for naval operations in allied and coalition format is a challenge for the training of communications specialists. This paper proposes a training methodology developed on the basis of an adaptation of the approach described in Allied Communications Publication – ACP 125 Communication Instructions Radiotelephone Procedures. An experience acquired after many years of studying the document with cadets from the Bulgarian Naval Academy is shared. The paper identifies the main paragraphs subject to adaptation, lists the added examples and explanations, and points out some specific features during the practical play through of scenarios in simulation environment.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 483-485
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A proposed Evidential Reasoning (ER) Methodology for Quantitative Assessment of Non-Technical Skills (NTS) Amongst Merchant Navy Deck Officers in a Ship’s Bridge Simulator Environment
    Autorzy:
    Saeed, F.
    Bury, A.
    Bonsall, S.
    Riahi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/116485.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Evidential Reasoning (ER)
    quantitative assessment
    methodology for quantitative assessment
    Non-Technical Skills (NTS)
    merchant navy deck officers
    ship’s bridge simulator
    evidential reasoning algorithm
    simulated bridge environment
    Opis:
    Ship’s bridge simulators are very popular in the worldwide training and assessment of merchant navy deck officers. The examiners of simulator courses presently do not have a method to quantitatively assess the performance of a group or an individual. Some examiners use checklists and others use their gut feeling to grade competence. In this paper a novel methodology is established that uses the Evidential Reasoning algorithm to quantitatively assess the Non-Technical Skills (NTS) of merchant navy officers. To begin with, interviews were conducted with experienced deck officers to develop the taxonomy and behavioural markers that would be used in the assessment process. A random selection of students studying towards their Chief Officer’s Certificate of Competency were recruited to have their NTS to be observed in a ship’s bridge simulator. The participant’s behaviour was rated against five criteria and the subsequent data was entered into the Evidential Reasoning algorithm to produce a crisp number. The results that were generated demonstrate that this approach provides a reliable method to quantitatively assess the NTS performance of merchant navy officers in a simulated bridge environment.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 597-608
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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