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Shock and Vibration
Volume 16 (2009), Issue 2, Pages 117-142
http://dx.doi.org/10.3233/SAV-2009-0456

Minimal-Sensing, Passive Force Identification Techniques for a Composite Structural Missile Component

Nick Stites,1 Jonathan White,1 Douglas E. Adams,1 and Matt Triplett2

1Purdue University, Ray W. Herrick Laboratories, 140 S. Intramural Drive, West Lafayette, IN 47906, USA
2U.S. Army RDECOM, AMSRD-AMR-PS-AM, Redstone Arsenal, AL 35898, USA

Received 17 September 2007

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Structural health monitoring systems are often limited to the use of one sensor due to cost, complexity, and weight restrictions. Therefore, there is a need to develop load and damage identification techniques that utilize only one sensor. Two passive force estimation techniques are investigated in this work. The techniques focus on either the shape or the amplitude of the magnitude of the applied force in the frequency domain. Both techniques iteratively reduce an underdetermined set of equations of motion into many overdetermined systems of equations to solve for the force estimates. The techniques are shown to locate and quantify impulsive impacts with over 97% accuracy and non-impulsive impacts with at least 87% accuracy. A filament-wound rocket motor casing is used as a test structure. Impacts not acting at a specific input degree of freedom are also accurately located depending on the distance away from the modeled input degrees of freedom, and damaging impact forces are quantified by making assumptions about the impulsive nature of the applied force.