Modeling and Simulation of the Projectile’s In-Bore Motion of Rifled Gun in Launch Dynamics

As a widely used artillery in modern warfare, rifled gun occupies an irreplaceable position in land warfare, whose excellent performance has important value in combat. Nowadays, the mobility and protection capabilities of military equipment have been greatly enhanced, which puts forward higher requirements for the performance of artillery systems, and also brings greater challenges to the design of rifled gun systems. Launch dynamics studies the motions and forces of the artillery and the projectile during the launch process, which is of great significance for analysis and optimizing dynamic performance of the artillery and the projectile. Establishing and perfecting the launch dynamics model of rifled gun provides a solid foundation for significantly reducing the design cost, shortening the development cycle, and evaluating and improving the dynamics performance of an artillery system. Aiming at the whole process of marching launch of the rifled gun system, in this paper, firstly, the 3-DOF model of the rifled gun system including the rotational body, pitching body and recoiling parts is established by using the analytical mechanics method, and then the 6-DOF model of the projectile’s motion in bore of the rifled gun is established by using the Newton–Euler method. Combined with the classical internal ballistic propellant combustion model, the movement of the projectile in the bore of the rifled gun is numerically simulated. Finally, to verify the correctness of the classical interior ballistic model and to lay the foundation for further establishing an accurate dynamic model of the entire weapon system, the simulation results are compared with the simulation results of the classical interior ballistic model, which utilize the average pressure and subordinate work calculation coefficient to express dynamic equation of projectile.