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27 March 2012 Steerable Adaptive Bullet (StAB) piezoelectric flight control system
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This paper outlines a new class of piezoelectric flight control actuators which are specifically intended for use in guided hard-launched munitions from under 5.56mm to 40mm in caliber. In March of 2011, US Pat. 7,898,153 was issued, describing this new class of actuators, how they are mounted, laminated, energized and used to control the flight of a wide variety of munitions. This paper is the technical conference paper companion to the Patent. A Low Net Passive Stiffness (LNPS) Post Buckled Precompressed (PBP) piezoelectric actuator element for a 0.40 caliber body, 0.50 caliber round was built and tested. Aerodynamic modeling of the flight control actuator showed that canard deflections of just ±1° are more than sufficient to provide full flight control against 99% atmospherics to 2km of range while maintaining just 10cm of dispersion with lethal energy pressure levels upon terminal contact. Supersonic wind tunnel testing was conducted as well as a sweep of axial compression. The LNPS/PBP configuration exhibited an amplification factor of 3.8 while maintaining equivalent corner frequencies in excess of 100 Hz and deflection levels of ±1°. The paper concludes with a fabrication and assembly cost analysis on a mass production scale.
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Ron Barrett, Ryan Barnhart, and Richard Bramlette "Steerable Adaptive Bullet (StAB) piezoelectric flight control system", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83410Z (27 March 2012); doi: 10.1117/12.915056;

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