Simulation of Sequential Setback and Aerodynamic Drag of Ordnance Projectiles
HARRY DIAMOND LABS ADELPHI MD
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Various testers are used to provide simulation of artillery interior ballistic environments setback, angular acceleration and exterior ballistic environments spin, aerodynamic drag. This paper describes the work performed to combine setback and drag into a single laboratory tester to simulate these environments sequentially, as they would occur in real launch. A variety of pulse shapes has been obtained in this simulator and in other simulators used for setback only with peak accelerations of 300 to 100,000 g acceleration of gravity at impact speeds up to 1500 fts 460 ms and energies up to 55,000 ft-lb 7600-m-kg. The present tests attained maximum setbacks of 5000 g with a pulse duration of 1.5 ms. A steady-state drag commenced within 4 ms of the completion of setback, and aerodynamic drag up to 30 g was simulated for periods up to 20 ms. Good agreement between test and predicted data was found for both setback and drag.