Methodical approach to determine the dependence of the deviation of the initial speed of the shells through the extension of the charging chamber artillery guns, measured with the help of the instrument for measuring the chambers

The analysis results of the military use of artillery in the anti-terrorist operation in the east of the country indicate a significant amount of fire tasks, which relied on artillery and the high intensity of their implementation by artillery units, which negatively affected the technical condition of artillery systems. The monitoring of the technical state of the artillery armament of the Armed Forces of Ukraine indicates a sufficient degree of the trunk channels wearing out for a significant number of artillery systems, which directly affects the effectiveness of the fire tasks execution by artillery units. Due to the lack of artillery units provided by artillery ballistic stations, the determination of the change in the initial speed of the shells is usually carried out with the help of gunmeters, and not all artillery systems have tables of dependence on deflection of the initial speed of the projectiles due to the extension of the charging chamber. Taking into account the above, the question of determining the dependence of the deviation of the initial speed of the projectiles due to the extension of the charging chamber is a vital and important task. As an accessible method of determining deflection parameters of initial velocities of shells through the extension of the artillery gun charging chamber, a methodological approach with the use of internal ballistics tables is proposed. The basis of this approach is to take into account the effect of mechanical wearing out on the gun barrel channel to change the initial velocity of the projectile using known tabular dependencies. Input parameters of the methodical approach are: gauge caliber; coefficient of taking into account the depth of cuts; formular length of the charging chamber; volume of charging chamber; full path of the projectile by the trunk channel; the weight of the projectile; maximum pressure of powder gases; weight of powder charge. The proposed methodological approach is designed to improve the ballistic training activities carried out in artillery units and to develop dependency tables to determine the change in the initial velocity of the shells with the help of a gun measuring instrument for artillery systems.