Six-Dimensional Ballistics of a Certain Howitzer Projectile Considered with Dynamic Unbalance

The fabrication error and assembly error of warhead and fuse will cause the dynamic unbalance of howitzer projectile, which will bring a negative impact on the safety and reliability of fuse. In order to obtain the motion of a certain 155 mm howitzer projectile on the exterior ballistics, the six-dimensional rigid body motion equations of the projectile were studied. The aerodynamic parameters which needed for the six-dimensional rigid body motion equations of the projectile’s exterior ballistics need to be obtained by simulation. Firstly, the credibility of the simulation method is verified in this paper. Then the aerodynamic parameters of the projectile are obtained by numerical simulation of the projectile flow field. When solving the six-dimensional rigid body motion equations of projectile exterior ballistics, the dynamic unbalance of projectile is considered. The calculation results are very important for the safety and reliability of fuze on the projectile under the condition of dynamic unbalance.