Prediction of Swerving Motion of a Dual-Spin Projectile With Lateral Pulsejets in Atmospheric Flight

Report No. ARL-CR-570
Authors: Bradley Burchett, Allen Peterson, and Mark Costello
Date/Pages: November 2005; 30 pages
Abstract: Using the linear theory for a dual-spin projectile in atmospheric flight, closed form expressions were obtained for swerving motion under the action of lateral pulsejets. Trajectory results generated by the linear theory equations and a fully nonlinear seven degree-of-freedom dual-spin projectile model agreed favorably. The analytic solution provided a relatively straight forward and computationally efficient means of trajectory estimation which is useful within smart weapon flight control systems. In order to accurately predict the impact point using the analytic solution, the dual-spin projectile linear model must be updated periodically. Terminal impact point prediction degrades rapidly as the linear model update interval is increased beyond a critical value. Control authority, as defined by the change in impact location due to a pulsejet firing, steadily decreases as a function of projectile down range position.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2005