Accession Number : ADP009071

Title :   An Experimental Validation of the SIMBAD Gun Dynamics Simulation Package for Flexible Saboted Long Rod Projectiles.

Corporate Author : ROYAL MILITARY COLL OF SCIENCE SHRIVENHAM (UNITED KINGDOM)

Personal Author(s) : Hoyle, J. B. ; Bulman, D. N.

Report Date : SEP 1993

Pagination or Media Count : 12

Abstract : An experimental firing programme has been carried out using the RMCS 30mm Air Powered Gun to study the flexing of saboted long rod penetrators in-bore. A number of special two piece projectiles were developed, each with as nearly as possible the same mass, position of centre of gravity, pitch inertia, and band spacing, but with different rod diameters. A rigid one piece projectile was also developed, that had the same physical properties and band spacings. A refined technique for measuring the in-bore motion of the shot was introduced into the experimental facility. This technique enabled the pitch and yaw motion of the front end of the rod to be measured, thus producing data that could be directly compared with theoretical simulations. The technique made use of an optical displacement transducer mounted perpendicular to and down range from the muzzle. A light beam from this transducer was directed on to a mirror on the front of the projectile via a circular mirror in the path of the shot. This latter mirror was formed by stretching a thin aluminised membrane over an annulus, through which the projectile passed without damage. The displacement of the returning light beam from the projectile was then measured by the transducer, from which shot pitch and yaw motions could be calculated. Accurate measurement of the barrel profile was found to be necessary for the simulation work. This was achieved by pushing the rigid one piece shot slowly down the barrel, whilst measuring its pitch angle. The resulting data was then analysed to remove the gravity droop component, thus producing the barrel bend.

Descriptors :   *RODS, *KINETIC ENERGY PROJECTILES, *FLEXURAL PROPERTIES, *INTERIOR BALLISTICS, ANGLES, BORES, DAMAGE, DISPLACEMENT, INERTIA, LIGHT, MASS, MEASUREMENT, MEMBRANES, MIRRORS, MOTION, NUMBERS, PATHS, PHYSICAL PROPERTIES, PROFILES, PROJECTILES, RODS, SIMULATION, TRANSDUCERS, TUBES, WATER, WORK, YAW, SABOT PROJECTILES, GUN BARRELS, GREAT BRITAIN.

Subject Categories : Ammunition and Explosives
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE