There is no general concept for the introduction of mathematical modeling in geoinformation systems of navigational-hydrographic and hydrometeorological navigation, since not all tasks are subject to mathematical modeling.
Therefore, at the first stage it is considered relevant to demonstrate the possibilities of mathematical modeling in the direction of hydrometeorological and especially navigational and hydrographic support of navigation, as part of the system of maritime safety through effective maneuvering and control of ship traffic and on the basis of experience to expand methods of mathematical modeling.
Scientific novelty in the thesis results is to create a methodological basis for solving the problem of calculating the statistical methods the results of mathematical modeling of processes on the basis of which is provided by solving the operational navigation-hydrographic and hydrometeorological support shipping as a component of navigation safety through effective maneuver and control the movement of vehicles.
In the dissertation work the following scientific results were obtained:
- for the first time an algorithm for improving the positioning accuracy of ships (calculation of systematic error in determining the orbital characteristics of geodetic satellites relative to the center of the geocentric system WGS-84) is proposed, which has both fundamental theoretical significance and can be the basis for further improvement in order to ensure the safety of navigation, by effective maneuvering and control of the movement of the vessel, characterized by a lack of information in the existing scientific literature;
- for the first time the algorithm of calculation by statistical methods of results of mathematical modeling of propagation of a hydroacoustic wave according to the radiation theory is offered (possibility of existence of periodic in space of display of zones of an acoustic shadow is established); in practice, this allows more efficient use of ship sonar, which makes it possible to ensure the safety of navigation by effectively maneuvering and controlling the movement of the vessel. In the interests of the Navy of the Armed Forces of Ukraine, this will allow at a higher level to perform tactical maneuvering techniques, taking into account the calculation of the acoustic fields of the ship and the acoustic fields of sonar stations;
- algorithms of statistical calculations of results of mathematical modeling of acoustic field of the vessel are improved; created a methodological basis for determining the speed-dependent long-wave component of the acoustic field of the vessel, which is formed by the underwater part of the hull, which allows to ensure the safety of navigation by effectively maneuvering and controlling the movement of the vessel in a mine threat;
- further development of the algorithm for statistical calculation of the results of mathematical hydrodynamic modeling of the hydrodynamic field of the vessel, which can suddenly change the speed of its movement, which allows to ensure the safety of navigation by effectively maneuvering and controlling the movement of the vessel;
- algorithms for statistical calculation of the results of mathematical hydrodynamic modeling of drift currents on the example of the water area of the Odessa commercial port were further developed. That is, a test calculation of the vertical distribution of speed and direction of currents in the waters of the Odessa commercial port was performed. Under conditions of gusty wind in the water area of the port there are drift (surface) and compensatory (bottom) currents. Under such conditions, the drift of vessels with different draft will occur in different directions. Due to the fact that currents and changes in their direction and speed with depth pose a significant navigational threat, affecting the effectiveness of ship control, it is proposed to supplement the existing geoinformation system with information layer 3D flows in ports and narrows;
- algorithms for statistical calculation of the results of mathematical hydrodynamic modeling of the processes of formation of temporary navigation obstacles such as bars and cans on the seabed were further developed.
Key words: ship motion control, ship maneuverability, mathematical hydrodynamic modeling, physical and statistical modeling, navigation-hydrographic and hydrometeorological support, hydroacoustic field of the ship, hydrodynamic field of the ship, errors of the satellite geodetic positioning system.
