Факультет психології, історії та соціології
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Item AUTOMATIC PREVENTION OF THE VESSEL’S PARAMETRIC ROLLING ON THE WAVE(2024) Kobets, V.; Zinchenko, S.; Tovstokoryi, O.; Nosov, P.; Popovych, I.; Попович, I.; Gritsuk, I.; Perederyi, V.Parametric resonance is one of the most dangerous phenomena that occurs during a storm. In the event of a parametric resonance, an undamaged and properly loaded vessel can capsize within seconds. The essence of parametric resonance is to change the parameters of the vessel as an oscillating system. In this case, the coefficients of the differential equations of the vessel model become functions of time. Parametric oscillations are observed at a certain ratio between the frequency of the external influence and the frequency of the system's own oscillations. Parametric resonance in the roll channel is especially dangerous, which leads to a sharp increase in the amplitude of the vessel's rolling, water entering the deck and inside the vessel's hull, loss of stability and possible capsizing. The existing methods of storming are not effective enough, which is due to the use of visual methods for estimating the parameters of turbulence and manual graphic constructions, significant time delays between obtaining data for calculation and determining safe parameters of motion, the lack of constant measurement of turbulence parameters and refinement of safe motion parameters, the difficulty of selecting the dominant factor from the system dangerous factors, intuitive assessment of the level of danger. The authors have developed a method of automatic avoidance of parametric resonance, which differs from existing methods in that it automates the processes of measurement and information processing, reduces delays in decision-making, reduces the influence of the human factor on control processes, reduces crew fatigue, reduces the risks of losing the vessel and cargo, and in general increases the navigation safety. The developed method can be used for both manual and automatic control. In the manual control mode, the shipmaster has the opportunity to use automatically measured information and the results of its processing - visualization of parametric resonance areas and the position of the phase point for making management decisions. In the automatic control mode, the system itself calculates and implements safe movement parameters, and the shipmaster only observes its operation. The obtained results are reproducible and can be used to develop the functionality of automated systems and/or automatic parametric resonance avoidance modules.Item CONTROL OF THE PIVOT POINT POSITION OF A CONVENTIONAL SINGLE-SCREW VESSEL(2023) Kobets, V.; Popovych, I. S.; Zinchenko, S.; Tovstokoryi, O.; Nosov, P.; Kyrychenko, K.; Попович, І. С.The issues of using the pivot point concept for the control of a conventional single-screw vessel are considered. The relevance of the task lies in the need for a more accurate assessment of the vessel's trajectory and the necessary area for maneuvering, since conventional single-screw vessels have low maneuverability, and their share in the total number of vessels exceeds 85%. For manual maneuvering of the vessel, using the pivot point, it is important to know the position of the pivot point relative to a fixed point of the vessel’s hull. Traditionally, this point was the gravity center/middle frame of the vessel. The disadvantage of the existing approaches to the calculation of the pivot point position was the use of a simplified calculation scheme ”gravity center – pivot point”, which did not take into account the dependence of the pivot point position on the rotation center position. In previous works, the authors of this article proposed the “gravity center – rotation center – pivot point” calculation scheme, which made it possible to more accurately estimate the pivot point position, taking into account the position of the rotation center. In the refined scheme proposed by the author, the pivot point position was determined relative to the moving rotation center, which is not convenient for manual control. In this article, for a single-screw conventional vessel, a formula and graphs of pivot point position relative to a fixed point on the vessel’s hull (gravity center/middle frame) are obtained, for the refined calculation scheme “gravity center – rotation center – pivot point”. The obtained formulas and graphs of the pivot point position relative to a fix point (gravity center/middle frame) allow us to use them both for automatic and manual control of the vessel’s movement. Mathematical modeling of a single-screw conventional vessel movement in the closed circuit “Control object – Control system” was carried out for the two considered calculation schemes. The simulation results showed that the use of the refined calculation schem allows for a 23% more accurate assessment of the vessel’s trajectory and the required maneuvering area.Item CONTROL OF THE PIVOT POINT POSITION OF A CONVENTIONAL SINGLE-SCREW VESSEL(2023) Zinchenko, S.; Kobets, V.; Tovstokoryi, O.; Kyrychenko, K.; Nosov, P.; Popovych, I. S.; Зінченко, С. М.; Кобець, В.; Товстокорий, О.; Кириченко, К. В.; Носов, П.; Попович, І. С.The article deals with the issue of reducing the maneuvering area of a conventional single-screw vessel due to the use, when determining controls, of the refined calculation scheme "gravity center – rotation center – pivot point".