Analysis of dynamic characteristics of fixed-wing dual-spin projectiles

Fixed-wing dual-spin projectile is a class of trajectory correction projectile, of which the forward course correction fuze (CCF) and aft body can rotate at different spin rates during flight. According to its aerodynamic asymmetry characteristics, the dynamic model of fixed-wing dual-spin projectiles is derived. Nonhomogeneous angular motion equations are calculated by simplifying the model. The angular motion characteristics and stability of fixed-wing dual-spin projectiles are studied based on the angular motion equations. The results show that, when the roll rate of the CCF is constant, the angular motion characteristics of projectile are greatly affected by both the roll rate and rolling direction, and an unreasonable roll rate may cause the instability of angular motion because of the resonance; when the spin angle of the CCF stays at any angular position, the projectile has the course correction ability which is proportional to the installation angle of the canard wings. Ultimately the stability criterion of fixed-wing dual-spin projectiles is studied.