Ballistic Characteristics of Dual-Spin Projectile with Asymmetric Front Body

Abstract

Non-axisymmetric arrangement devices in a dual-spin projectile may lead to the asymmetry of the front body, thus affecting the ballistic characteristics. This article presents a 7 Degree-of-Freedom (7-DOF) flight dynamic model which includes a model of additional moment that arises due to asymmetric factors. Two aspects of the ballistic characteristics are studied, namely the first maximum angle of attack and the range of variation. Simulation results indicate that a small asymmetric angle, less than 1 degree, can result in a large change in the angle of attack by up to 6.5 degrees in pitch. But attenuation of the range in the X direction is only 10m. Moreover, when the rotational inertia ratio IA / IF is more than 2, it has little effect on range. The maximum range of attenuation is about 10m at the point where the rotational inertia ratio A F I / I is equal to 1.