Effect of a Bore Evacuator on Projectile In-Bore Dynamics.

摘要

Projectile base pressure measurements were taken in a 155-mm M284 gun tube using an Armament Research, Development and Engineering Center- designed instrumentation package incorporated into a modified XM982 artillery projectile. These measurements showed that the base pressure was affected as the projectile passed the bore evacuator ports. The perturbation in base pressure generated a high frequency response in the projectile. A simplified finite element model of the projectile was constructed and verified that the projectile dynamics were captured properly by the instrumentation. A dynamic response was also witnessed at abrupt changes in gun tub cross-section. This response has not been explained to date.