Optimal Parameters for Maneuverability of Affordable Precision Munitions

Report No. ARL-TR-5647
Authors: Frank Fresconi, Ilmars Celmins, and Luisa Fairfax
Date/Pages: August 2011; 42 pages
Abstract: High maneuverability of guided projectiles enables engagement of fleeing targets, opens the area of influence of a weapons system, and allows new missions to be performed such as prosecuting targets in defilade. Gun-launched precision munitions have unique constraints that create technical barriers to achieving enhanced maneuverability. Structural integrity during the gun launch event, packaging control surfaces within the launch tube, and affordability are paramount concerns. This work is a fundamental investigation of the flight mechanics and guidance, navigation, and control technologies necessary to optimize maneuverability of affordable precision projectiles. Detailed aerodynamic modeling and nonlinear equations of motion for the flight of a fin-stabilized airframe meeting low control authority constraints were simulated. Flight control laws were developed for various maneuver schemes with different actuator realizations. Simulations were conducted over a large parameter space to evaluate maneuverability. Results provide the optimal parameters within the distinctive scope of gun-launched munitions. Flying a skid-to-turn airframe with four canards in the "X"configuration maximizes control authority with moderate volume allocation and actuator bandwidth requirements. Examination of dynamic stability along with static stability illustrates that high-fidelity aerodynamic characterizations are required when optimizing maneuverability due to their impact on airframe design and flight control algorithm development.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2011