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Proceedings Paper

Modeling, design, and testing of a barrel-launched adaptive munition
Author(s): Ronald M. Barrett; James Stutts III
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Paper Abstract

Structural and aerodynamic models for a 10 degree half-angle, articulated, conical, barrel-launched adaptive munition (BLAM) are presented. The forward half of the test BLAM was gimballed and actuated by two orthogonal pairs of piezoceramic tendons. Laminated plate theory models showed that piezoceramic actuators could survive hard-launch conditions if they were properly precompressed by using an elevated temperature cure cycle and a high, favorable mismatch in coefficient of thermal expansion between the substrate and the piezoceramic. Aerodynamic models based on supersonic pressure distributions over cones were used to predict free-flight trim angles and normal force range. A series of bench tests on a 13.4 cm (5.28 in) long BLAM showed plus or minus 0.12 degree steady articulation angles and a first natural frequency of 198 Hz with close agreement between theory and experiment. A series of wind tunnel tests at Mach 3.26 demonstrated a steady deflection increase with field, producing untrimmed normal force coefficient changes of plus or minus 0.0019. Extrapolation of the data to a 105 mm (4.13 in) caliber PGU-28 shaped round fired at 610 m/s (2,000 ft/s) showed that effective range increases by more than a factor of 15 over the conventional PGU-28.

Paper Details

Date Published: 6 June 1997
PDF: 12 pages
Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); doi: 10.1117/12.275680
Show Author Affiliations
Ronald M. Barrett, Auburn Univ. (United States)
James Stutts III, Auburn Univ. (United States)

Published in SPIE Proceedings Vol. 3041:
Smart Structures and Materials 1997: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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