Abstract
The study of the process of firing a firearm, taking into account the degree of wear of the barrel, requires an assessment of the losses of powder gases due to their breakthrough between the barrel walls and the projectile. Currently, the known methods for solving the equations of internal ballistics do not provide for obtaining results wich take into account the loss of part of the powder gases. As a result, there was a need to overcome the contradiction between the needs of applied ballistics and the capabilities of the existing scientific and methodological apparatus for solving the equations of internal ballistics. The principles of construction of the difference scheme for the numerical solution of the equations of internal ballistics on the condition of the influence of typical defects of the barrel channels and ammunition are stated. Recurrent expressions for step-by-step calculation of ballistic elements of the shot are given, initial conditions for the first and second periods of the shot are defined. The practical testing of the difference scheme by the numerical solution of the equations of internal ballistics for characteristic combinations of initial data is carried out and its adequacy is confirmed. The expediency of creating a database of ballistic shot elements for typical defects of the barrel channels and powder charges is substantiated. As a result of researches, the difference scheme for the numerical solution of the equations of internal ballistics wich provide the possibility of taking into account the influence of typical defects of the barrel channels and ammunition on ballistic elements of the shot is obtained. This opens the way to improving the operational control of the technical condition of weapons and ammunition by advancing its reliability and efficiency. Based on the numerical solution of the equations of internal ballistics, it is possible to simulate the influence of the deviation of the geometrical parameters of the barrel channel and the degradation of the powder charge on the course of the shot process. This explains the importance and usefulness of the work for applied ballistics
Highlights
The effectiveness of the use of firearms with appropriate ammunition depends on both, the stability of its basic ballistic characteristics and compliance of the values of these characteristics with the established norms [1]
Ballistic characteristics largely depend on the technical condition of weapons and ammunition, which affects the course of the
During long-term storage of ammunition, especially due to violations of its regime, the energy characteristics of gunpowder and the speed of its combustion change. This is reflected in the ballistic elements of the shot and leads to a deviation of the initial velocity of the projectile, and in some cases – a dangerous increase in the maximum pressure of powder gases in the barrel
Summary
The effectiveness of the use of firearms with appropriate ammunition depends on both, the stability of its basic ballistic characteristics and compliance of the values of these characteristics with the established norms [1]. During long-term storage of ammunition, especially due to violations of its regime, the energy characteristics of gunpowder and the speed of its combustion change This is reflected in the ballistic elements of the shot and leads to a deviation of the initial velocity of the projectile, and in some cases – a dangerous increase in the maximum pressure of powder gases in the barrel. The study of the dependence of the ballistic characteristics of firearms on the technical condition of weapons and ammunition is associated with the need to simulate the influence of the parameters of the barrel and powder charge on the ballistic elements of the shot. In the framework of this scientific direction, the way to the modeling the influence of deviations of geometrical parameters of the bore and the degradation of the powder charge on the course of the shooting process can be opened
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