Abstract: A projectile-barrel coupled system of large caliber gun for launching a guided projectile with sliding driving band is studied. A guided projectile-barrel coupled dynamic finite element model of some large caliber gun is established based on elastic and plastic finite element theory. The projectile stress, squeezing resistance, and dynamic response between projectile and barrel in the process of projectile squeezing into rifling grooves and the process of straight moving of guided projectile in bore considering increased twist rifling, uniform twist rifling and increasing-uniform combined rifling, as well as deep rifling and shallow rifling are calculated. The relationship between the rifling structure of large caliber gun and the motion of guided projectile in bore is obtained.

Key words: ordnance science and technology, gun rifling structure, sliding driving band, projectile moving in bore, finite element method