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Proceedings Paper

Detection of fastener failure in a thermal protection system
Author(s): Mark M. Derriso; Steven E. Olson; William R. Braisted; Martin P. DeSimio; John Rosenstengel; Kevin Brown
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Paper Abstract

This paper presents experimental and analytical studies focused on the development of a structural health monitoring system to assess the condition of mechanical fasteners of a thermal protection system. A realistic thermal protection system component, consisting of a carbon-carbon panel bolted through 15 brackets to a backing structure, is utilized. Mechanical states considered include all bolts fastened to a nominal torque value, or one of the 15 bolts loosened. Four transducers on the backing structure provide actuation and sensing signals. Spectral functions are computed from all single and pair-wise signal combinations. Automated analysis of the spectral functions shows frequency intervals exist over which the function values are indicative of the mechanical state of the test article. These frequency intervals are used to provide features for the structural health monitoring classifier. Finite element analyses provide a physics-based understanding of these features. Statistical pattern recognition methods select a subset of the features. The overall localization accuracy of the structural health monitoring system on test data is 99.1% with 99.7% probability of detecting a damaged condition at a 0.2% probability of a false alarm.

Paper Details

Date Published: 26 July 2004
PDF: 12 pages
Proc. SPIE 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems, (26 July 2004); doi: 10.1117/12.562967
Show Author Affiliations
Mark M. Derriso, Air Force Research Lab. (United States)
Steven E. Olson, Univ. of Dayton Research Institute (United States)
William R. Braisted, Univ. of Dayton Research Institute (United States)
Martin P. DeSimio, iCAD, Inc. (United States)
John Rosenstengel, iCAD, Inc. (United States)
Kevin Brown, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 5390:
Smart Structures and Materials 2004: Smart Structures and Integrated Systems
Alison B. Flatau, Editor(s)

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