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Proceedings Paper

Direct operational load monitoring approach for structural prognosis
Author(s): Howard M. Matt; Kevin Napolitano; Michael D Todd; Shawn Hertz
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Paper Abstract

For future structural health monitoring (SHM) systems, the knowledge of past and present operational loads in the form of forces/moments at critical system interfaces will be invaluable for performing accurate prognostics and augmenting SHM capabilities. However, this information is not a direct product of traditional operational loads monitoring (OLM) techniques employed on current fleet aircraft and is not easily achieved using existing force measurement devices. In recognition of this limitation, this paper addresses the development of an accurate in-situ multiaxis force measurement system for directly monitoring dynamic operational loads at critical mechanical interfaces without altering the existing connector architecture. The proposed methodology utilizes a strain gage-based measurement technique in which a series of sensors is calibrated with a set of known loading configurations. The sensitivity matrix relating the measured strains to the loads forms the core of the system. The feasibility of the proposed technique was demonstrated both analytically and experimentally on a representative aircraft weapon store/rail interface exhibiting nonlinearity in the system. The results are conclusive in that the outlined trained network approach is able to accurately predict all six force/moment interface loads with less than 8 percent total error under various loading conditions.

Paper Details

Date Published: 27 April 2011
PDF: 11 pages
Proc. SPIE 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011, 797906 (27 April 2011); doi: 10.1117/12.879937
Show Author Affiliations
Howard M. Matt, ATA Engineering, Inc. (United States)
Kevin Napolitano, ATA Engineering, Inc. (United States)
Michael D Todd, Univ. of California, San Diego (United States)
Shawn Hertz, Naval Air Warfare Ctr. Weapons Div. (United States)

Published in SPIE Proceedings Vol. 7979:
Industrial and Commercial Applications of Smart Structures Technologies 2011
Kevin M. Farinholt; Steve F. Griffin, Editor(s)

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