Projectile motion in a flexible gun tube

(Сойфер Мартин Т., Беккер Роберт С. Движение снаряда в гибком орудийном стволе).Contract report. -Aberdeen: US Army Ballistic Research Laboratory, 1984. – 84 р.A general, six degree-of-freedom model of a projectile of finite geometry and inertia traveling in a flexible, rifled or smoothbore gun tube has been developed. The model accommodates projectile spin, mass eccentricity, projectile/bore interfacial friction, elastic/plastic deformation of the projectile rotating band, and balloting - including bourrelet impact and rebound with the bore. The model is unrestricted regarding gun tube motion, and provides the ability to assess the mutual effects of projectile/gun-tube interaction when solved simultaneously with the equations of a compatible gun dynamics simulation, such as DYNACODE-G. The basic formulation has been compared with other projectile in-bore motion formulations and descriptions appearing in recent literature, and is considered to be the most general developed to date. In addition, the model has been correlated with experimental in-bore radar doppler data obtained from firings of a specially designed 37 - mm weapon, and has demonstrated excellent theoretical/experimental agreement.Contents:
Introduction.
Formulation of projectile equations of motion.
Comparison with other projectile motion formulations.
Correlation with experimental data.
Incorporation of model within DYNACODE-G.
Conclusions and recommendations.