Kuzmenko V. Automated diagnosis of artillery gun shots based on simulated modeling of states by Markov chains

The dissertation work is devoted to the evaluation of the effectiveness of the artillery unit, the reduction of the minimum time spent by artillery units at the firing position, and the optimization of the consumption of projectiles for damage in the presence of random disturbances during firing. This becomes possible when considering the gun automation system as a set of conditions that contribute to the formation of free carbon during the explosion and the burning of the charge during an artillery shot. The search for an effective state is carried out through the application of the Markov model and automated structural shot identification, which are the result of different physical nature of the signs of the states. The following results were obtained in the first chapter "Automated field artillery combat application systems for state diagnostics". Automation systems for controlling artillery units were considered. Minimizing the time for decision-making and their subsequent implementation is the main criterion for the execution of a combat mission by artillery. The importance of solving the diagnosis task is determined by the fact that the use of currently available selection operators for diagnosing the states of the trunk system makes it possible to resolve the contradiction between the high requirements for reliability, operational efficiency and effectiveness of combat work as a component of the control system and the limited period of time for the execution of the combat task under the condition of maximizing time finding the barrel system in combat condition. It is shown that the states of the "chamber - barrel - charge - projectile" system can be represented by an oriented graph. Such conditions have a probable origin and can be structurally identified by considering the special features of the shot, which have a different physical nature of occurrence. In their quality, the visual manifestation of the shot can be used, firstly, in the form of a muzzle blast and, secondly, the sound manifestation of the shot in the form of the acoustic field of the muzzle and ballistic waves. The information models of special features of the shot were analyzed using selection operators. The structure of the research is substantiated and the task is set, which consists in evaluating the effectiveness of artillery fire, reducing the time spent by artillery installations at the firing position, and optimal consumption of projectiles for damage in the presence of random disturbances of the fire. For this, selection operators are used for states that contribute to the formation of free carbon during the shot. The Markov model determines the parameters of states of different physical nature of occurrence and changes in the life cycle of an artillery shot. The following results were obtained in the second chapter, "The model of free carbon formation during the firing of an artillery gun": On the basis of the analysis of the conditions under which the expansion of powder gases occurs during an artillery shot, a chemical reaction was determined, which allows to explain the formation of free carbon during the explosion and combustion of the charge. Its feature is a shift in the equilibrium state towards the formation of free carbon when the temperature field decreases. Modeling of the parameters of the powder ga expansion process is based on the equations of the first law of thermodynamics for the adiabatic process and Newton's second law in differential form. The specific enthalpy of combustion and explosion is determined by the strength of the gunpowder. The molar mass of powder gases is determined considering the results of solving the problem of chemical kinetics of combustion and explosion. The information model made it possible to detect changes in the temperature field along the length of the barrel. This made it possible to determine the state of formation of the condensed phase of free carbon. A method of determining the temperature field and energy of powder gases along the length of the barrel during an artillery shot based on the proposed information model was developed. The peculiarity of the method is the use of a constant part of the mass of the burning gunpowder as a characteristic value of the final element. Another feature is consideration of the directed number of finite elements in the solution process in the form of an oriented graph of states. The limits of the formation process of the condensed phase of free carbon along the length of the barrel were found. The distribution of the temperature field in the space of the barrel between the charging chamber and the projectile is determined, which is a prerequisite for the formation of an oriented graph of states. Based on these data, the change in the length of the zone of occurrence of the chemical reaction was determined.