Direct operational load monitoring approach for structural prognosis

Howard M. Matt; Kevin Napolitano; Michael D Todd; Shawn Hertz

doi:10.1117/12.879937

27 April 2011 Direct operational load monitoring approach for structural prognosis

Howard M. Matt, Kevin Napolitano, Michael D Todd, Shawn Hertz

Proceedings Volume 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011; 797906 (2011) https://doi.org/10.1117/12.879937
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

Citation Download Citation

Howard M. Matt, Kevin Napolitano, Michael D Todd, and Shawn Hertz "Direct operational load monitoring approach for structural prognosis", Proc. SPIE 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011, 797906 (27 April 2011); https://doi.org/10.1117/12.879937

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KEYWORDS

Connectors

Calibration

Structural health monitoring

Interfaces

Missiles

Data modeling

Motion measurement

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