Modeling and Simulation of a Differential Roll Projectile

Report No. ARL-CR-455
Authors: Costello, Mark F.
Date/Pages: July 2000; 50 pages
Abstract: This report develops the equations of motion for a differential roll projectile configuration with seven degrees of freedom. The dynamic equations are generated generically such that the forward and aft components are mass unbalanced. A hydrodynamic bearing exists between the forward and aft components,which couples the roll degree of freedom. A simulation investigation shows that bearing resistance and forward/aft body mass ratio are the dominant factors in determining the roll dynamics. For spin rates typical of fin-stabilized projectiles, the trajectory is essentially independent of both bearing resistance and mass ratio.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2000