Browsing by Author "Kyrychenko, K."

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ANALYTICAL MODEL OF A SHIP’S STABILITY ON A REGULAR WAVE
(2024) Zinchenko, S.; Tovstokoryi, O.; Kyrychenko, K.; Nosov, P.; Popovych, I. S.; Попович, І. С.
One of the main dangers of sailing in storms is the change in the stability of ships due to waves, which in some cases can even lead to its overturning. Therefore, the task of constant control of the ship’s stability during the voyage is an urgent scientific and technical task. A systematic approach, analysis and synthesis, methods of mathematical analysis, integral calculus, and numerical modeling were used during the research. An analytical model was developed for calculating the restoring moment in the roll channel under regular waves, depending on the geo- metric dimensions of the ship’s hull, immersion parameters, ship motion parameters, and wave parameters. The obtained results di↵er from the known solutions in that they have an analytical form and can be used to assess stability in real time. The theoretical significance of the obtained results lies in the development of an analytical model for estimating sta- bility on regular excitation. The practical value of the obtained results consists in: checking the operability of the analytical model during a computational experiment and the possibility of its use in an on-board computer of an automated or automatic control system.
APPLICATION OF THE CONDITIONAL OPTIMIZATION METHOD IN THE PROBLEM OF VESSEL STORMY SAILING
(2024) Zinchenkо, S.; Tovstokoryi, O.; Mateichuk, V.; Nosov, P.; Popovych, I. S.; Kyrychenko, K.; Попович, І. С.
Stormy sailing conditions are among the most extreme and dangerous. The rocking of the ship in the roll and trim channels greatly exhausts the crew, which leads to an increase in the number of errors when making management decisions. The situation worsens also due to the fact that during a storm such dangerous phenomena as harmonic and parametric resonances, a decrease in stability on passing waves, broaching, impacts of group waves in the stern, which can lead to the , hull destruction, overloads of the power plant and occurrence of blackouts. The most radical way to combat such dangers is the automation of control processes. The authors have developed a method of automatic and optimal control of the ship's movement in storm conditions, which allows to avoid the occurrence and development of dangerous phenomena that lead to the capsize of the ship. The obtained result is explained by: the use of an on-board computer in the ship's motion control system; constant measurement of ship movement parameters and waves; finding, at each step of the on-board computer, safe and optimal values of the ship's course and speed by solving the optimization problem; taking into account when solving the optimization problem linear and non-linear constraints of the type of inequalities that define dangerous areas; maintaining safe and optimal movement parameters using the automatic control system. The theoretical significance of the obtained result lies in the development of a method of automatic and optimal control of the ship's movement in conditions of stormy sailing. The practical significance of the obtained results consists in: verification of the developed method by mathematical modeling; the possibility of using the method in the automatic control system, which allows to automate and optimize the processes of controlling a ship in a storm, reduce the influence of the human factor on control processes, crew fatigue, risks of losing the ship and cargo, and generally increase the safety of shipping
AUTOMATIC RESET OF KINETIC ENERGY IN CASE OF INEVITABLE COLLISION OF SHIPS
(2023) Zinchenko, S.; Kyrychenko, K.; Grosheva, O.; Nosov, P.; Popovych, I. S.; Mamenko, P.; Попович, І. С.
Considered issues of automatic reset of kinetic energy along the gradient in case of inevitable collision of ships. The target function of the fastest reset of kinetic energy is formed in the form of a scalar product of the gradient vector at the location of the vessel and the vector of the right parts of the mathematical model of the longitudinal and angular movement channels containing control. To form optimal controls, a nonlinear optimization procedure was used, taking into account control restrictions. The own ship's movement parameters (speed and course) used in the optimization procedure are measured by speed and course sensors, and the target's movement parameters are estimated from the measured values of the own ship's speed and course and the measured relative movement parameters using radar. The workability method was verified by mathematical modeling in a closed circuit with a control object. The results of the simulation showed that the automatic module provides a 9-fold reduction in the kinetic energy of the collision. The use of the automatic kinetic energy reset module in the event of an imminent collision will reduce the influence of the negative impact of decisions when handling a vessel under the influence of stress, reduce crew fatigue, prevent damage or even loss of the vessel and cargo, and save human lives.
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.
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".
PIVOT POINT POSITION DETERMINATION AND ITS USE FOR MANOEUVRING A VESSEL
(2022) Zinchenko, S.; Tovstokoryi, O.; Nosov, P.; Popovych, I. S.; Kyrychenko, K.; Зінченко, С. М.; Товстокорий, О.; Носов, П. С.; Попович, І. С.; Кириченко, К. В.
The article deals with the use of Pivot Point to optimize vessel control. It is shown that the position of the Pivot Point should be calculated relative to the center of rotation, and not the center of gravity, as previously thought. For the first time, the dependence of the rotation center displacement on the longitudinal speed of the vessel has been obtained. For the linear model of the vessel, the subdomains of admissible controls are constructed, and the special positions of the Pivot Point are analyzed. The dependence of the control distribution coefficient on the position of the Pivot Point is obtained. Optimal controls are considered. The operability and efficiency of the methods have been verified by mathematical modeling. У статті йдеться про використання точки опори для оптимізації керування судном. Показано, що положення точки опори слід розраховувати відносно центру обертання, а не центру ваги, як вважалося раніше. Вперше отримано залежність переміщення центру обертання від поздовжньої швидкості судна. Для лінійної моделі судна побудовано рівні допустимих елементів керування та проаналізовано спеціальні положення точки опори. Отримано залежність коефіцієнта розподілу контролю від положення точки опори. Розглянуто оптимальні засоби керування. Практичність та ефективність методів підтверджено математичним моделюванням.
PSYCHOLOGICAL CAUSES OF FATIGUE OF FOOTBALL PLAYERS
(2023) Shcherbak, T.; Popovych, I. S.; Kariyev, A.; Duisenbayeva, A.; Huzar, V.; Hoian, I.; Kyrychenko, K.; Попович, І. С.
The purpose of the research is to find out empirically and theoretically substantiate the psychological causes of football players’ fatigue. Methods. The ascertaining strategy of research and ranking of parameters has been applied. Valid and reliable psychodiagnostic methods have been used to measure parameters of professional maladjustment, self-assessment of psychophysiological state, differentiated assessment of performance, and the level of football players’ emotional burnout. Results. It was found that the high level of football player’s fatigue from the training-competitive cycle has been caused by a decrease in the efficiency of their psycho-functional systems: emotional changes (R=.920); a decrease in general activity (R=.810); a decrease in motivation to activity (R=.824); features of certain mental processes (R=.549); features of social interaction (R=.891). It has been shown that with a decrease in the indicators of the psychophysiological state, the feeling of fatigue increases: well-being (R=-.812); activity (R=-.840). As well as in relation to motivational factors of the appearance of fatigue: interest in sports (R=-.869); willingness to perform tasks (R=-.816). A statistically reliable inverse relationship has been established between all indicators of the psychophysiological state and predictors of fatigue: monotony, oversaturation, stress. It has been empirically established and explained that the drop in the level of football players’ performance, as a result of fatigue, can be caused by external negative influences: experiencing psycho-traumatic circumstances (R=.924); “being cornered” (R=.896); a desire to curtail professional activity: reduction of professional duties (R=.936); changes in team’s psychological climate: personal alienation (R=.924); changes in the emotional sphere: anxiety and depression (R=.882); inadequate selective emotional response (R=.867); emotional moral disorientation (R=.904); expansion of the sphere of emotional economy (R=.918); emotional deficit (R=.870); emotional alienation (R=.896). Discussion and conclusions. It has been summarized that football players with pronounced parameters of fatigue are much more often characterized by a deterioration in well-being, namely changes in the emotional sphere, a decrease in general activity and course of mental processes. At the same time, they are characterized by separate somatic vegetative disorders in sleep, peculiarities in social relations. In sports activities, they demonstrate reduced motivation and, accordingly, the lack of interest and motivation provokes a feeling of fatigue. It has been empirically found that the respondent football players with a pronounced feeling of fatigue demonstrate a high level of desire to stop their training and competition activities. These football players feel bored with monotonous, same-type activities and seek to change activity or diversify it.
RESEARCH OF DIVERGENCE TRAJECTORY WITH A GIVEN RISK OF SHIPS COLLISIONS
(2021) Mamenko, P.; Zinchenko, S.; Nosov, P.; Kyrychenko, K.; Popovych, I.; Nahrybelnyi, Ya.; Kobets, V.; Маменко, П. П.; Носов, П. С.; Попович, І. С.; Зінченко, С. М.; Кириченко, К.; Нагребельний, Я.; Кобець, В. М.
Розглянуто питання оптимального уникнення зіткнення в полі ризику цілі. Запропоновано метод оптимальної дивергенції шляхом маневрування курсом, що дає можливість мінімізувати траєкторію розбіжності при заданому ризику зіткнення та полягає в організації руху судна за траєкторією заданого ризику. Поле ризику цілі – це нормальний закон розподілу, що характеризується середньоквадратичними параметрами невизначеностей, пов’язаних з похибками вимірювання параметрів вектора стану судна і цілі, похибок виконавчих механізмів, похибок використаних математичних моделей, похибок розрахунку тощо. Перевірено працездатність та ефективність запропонованого методу, алгоритму та програмного забезпечення на стенді імітаційного моделювання, який є навігаційним симулятором Navi Trainer 5000 та моделлю бортового контролера, включеного в його локальну мережу з програмним забезпеченням модуля розбіжності ризиків. Стенд для імітаційного моделювання дозволяє розробляти програмне забезпечення систем управління, включаючи розглянутий оптимальний модуль дивергенції, у замкненому контурі з навігаційним симулятором Navi Trainer 5000, використовуючи всі його переваги.