Effect of Kinetic Energy Projectile Inertia upon Precision

摘要

To develop improved training rounds, aluminum was substituted for existing steel bodies. Accuracy firings showed that lower density projectiles had significantly greater round-to-round dispersion than standard designs. First ascribed to larger values of the aerodynamic jump coefficient Θ/ξ′_0, careful analysis of the data indicates that variability in initial dynamics dominates. A simple argument suggests that when the inertial properties of the round are changed it is necessary to match the sabot properties, for example, stiffness. To better understand this behavior, higher-fidelity simulations of the in-bore vibration and disengagement dynamics are required.