Gultsov P. Automated state control of objects moving along a free trajectory during dynamic disturbances

The dissertation is devoted to determining the optimal time of artillery gun combat use during lasting dynamic disturbances by improving simulation models and methods of automated state control to ensure minimal artillery shells losses and preserve the gun's combat efficiency. In the first chapter "Methods of determining the states of an artillery gun during dynamic disturbances" results were as follows: – Minimizing the decision-making time and further execution by the control system is the main criterion for artillery combat use. The results of the conditions study of the gun and its shots showed that in field conditions, improving the weapon's operation is possible only by considering disturbances affecting the existing physical fields. – It is shown that further combat task success requires an improvement of the method and model of effective automated control of artillery unit combat work during the target engagement under condition of changing the firing position to ensure least loss of combat capability and minimum time of artillery projectile movement along a free trajectory to the maximum range. The importance of developing a method and model of parabolic approximation for determining the collision coordinates of an artillery projectile with a surface based on the registration of a ballistic wave formed by an artillery projectile flying along a trajectory spatially distributed by a system of acoustic sensors, as a method of implementing a computer automation system, is substantiated. – The research structure is substantiated, and the task is set, which lies in determining the optimal time for combat task execution by an artillery gun during lasting dynamic disturbances using improving simulation models and methods of controlling the gun states to ensure minimal loss of its combat capability. The following results were gained in the second chapter "Modelling of the formation of muzzle discharge as a diagnostic sign of the state of the shot": – The reason for the impossibility of describing the phenomenon of soot formation using existing models of internal ballistics processes was determined. On example of the proposed model, an algorithm for solving the problem of internal ballistics was developed with possibility of determining the powder gases temperature along the barrel length at different moments based on the equilibrium model and varying artillery projectile positions in the barrel. – Based on analysis of conditions where powder gases expand during artillery fire, the temperature distribution of powder gases in the barrel cavity between charging chamber and moving projectile was modeled using a one-dimensional problem using the method of finite-difference elements. – A simulation model of the one-dimensional problem of distributed formation of powder gases, in particular soot, during their expansion in the state of an artillery gun shot was developed, which allowed to develop a method for determining the change in their temperature along the barrel length with the establishment of the limit amount of soot by the method of finite-difference elements. In the third chapter "Improving the method and model of controlling the combat mission of an artillery installation" for the automated control of the gun’s states during dynamic disturbances, the following is done: – The generalized quantitative criterion for evaluating the artillery unit firing efficiency during automated control in the presence of random disturbances of shots acting on the control system was improved. – A stochastic effectiveness model of sequential artillery unit firing based on Markov modeling was developed. – A control model for the combat use of an artillery installation was developed, which implements the task of destroying a target with a given shells number, subject to a change in firing position to reduce probability of its fire damage by an enemy artillery installation. – A method of finding a solution on the state of execution of combat use by attacking side's artillery installation based on the proposed model was developed. In the fourth chapter "The method of parabolic approximation for determining the coordinates of the collision of an artillery projectile with the surface" the goal of dissertation was achieved, namely: – A model and method for verification of an artillery shot with random disturbances was developed and investigated. Developed method allows to verify shot before the projectile lands and breaks. – A computing simulation experiment was conducted, which showed that the developed method allows to notably limit the time of artillery system fire implementation and reduce the cost of projectiles in compensation for dynamic disturbances compared to traditional firing. – A method of artillery projectile tracking during the effect of dynamic disturbances on it was firstly proposed based on registration of ballistic and muzzle waves at a distance formed by the projectile flight range.