Study On The Initial Disturbance Of Large Caliber Armor-piercing Fin-stabilized Discarding Sabot

The armor-piercing fin-stabilized discarding sabot occupies an important position in the research and development of ammunition in various countries because of its excellent armorpiercing performance.As the requirement of the first hit rate of weapons in modern warfare is getting higher and higher,it’s an important direction of development at present and even in the future to improve the firing accuracy of armor-piercing fin-stabilized discarding sabots.The complex motion state of the projectile in the bore and the shelling process directly affect the firing accuracy of the weapon.In this paper,aiming at a large-caliber armor-piercing finstabilized discarding sabot,it analyzes the factors that affect the initial disturbance of the armorpiercing fin-stabilized discarding sabot,simulates and calculates the initial disturbance of the projectile from the two periods of in-bore motion and shelling in the aftereffect period in order to improve the hit rate.First of all,based on the initial disturbance theory of the armor-piercing fin-stabilized discarding sabot,the motion characteristics of a large-caliber armor-piercing fin-stabilized discarding sabot in the in-bore movement period and the shelling period are studied respectively.Through it analyzes the motion process and force acting on the projectile in each period,the factors affecting the initial disturbance of the projectile in each period are determined.Secondly,combined with the motion characteristics of large-caliber armor-piercing finstabilized discarding sabot in bore,the explicit dynamic solution method and contact collision algorithm are analyzed,and the interior ballistic equations suitable for combustible cartridge are established by using the technical theory of high chamber pressure gun.Based on the finite element theory,the projectile-barrel coupling dynamic model is established,and its feasibility is verified.Then,the in-bore motion process of large-caliber armor-piercing fin-stabilized discarding sabot is analyzed and studied.From the point of view of the mass eccentricity of the projectile,the initial filling angle of the projectile and the clearance of the front centering part,the in-bore motion process of the projectile and the law of the initial disturbance affected by these factors are analyzed by using ABAQUS software.Finally,based on CFD dynamic grid technology and 6DOF technology,the numerical model of the shelling process of large-caliber armor-piercing fin-stabilized discarding sabot with muzzle flow field is established.In this paper,the shelling process of the armor-piercing fin-stabilized discarding sabot in the ideal state is simulated and analyzed,and the shelling process at different angles of attack is analyzed.The research results have certain theoretical significance for improving the firing accuracy of large-caliber armor-piercing fin-stabilized discarding sabots.