NDLI: Detection of fastener failure in a thermal protection system panel

Content Provider	IEEE Xplore Digital Library
Author	Rosenstengel, J. Miller, I. DeSimio, M. Derriso, M. Brown, K. Braisted, W. Olson, S.
Copyright Year	2004
Description	Author affiliation: Qualia Comput. Inc., Beavercreek, OH, USA (Rosenstengel, J.; Miller, I.; DeSimio, M.)
Abstract	This paper presents development methods and application results for a structural health monitoring (SHM) system for assessing the condition of mechanical fasteners in a test article representing a realistic portion of a thermal protection system. The test article is a carbon-carbon panel bolted through 15 brackets to a backing structure. 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: (cross) power spectral densities, transfer functions, and coherence functions. 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 SHM classifier. Statistical pattern recognition methods select a subset of the features. The status of the test article is determined as "undamaged" or "bolt j is loose." The overall localization accuracy of the SHM 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.
Sponsorship	Aerosp. and Electron. Syst. Soc
Starting Page	2464
Ending Page	2473
File Size	748911
Page Count	10
File Format	PDF
ISBN	0780381556
ISSN	1095323X
DOI	10.1109/AERO.2004.1368041
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fasteners Protection System testing Frequency Probability Condition monitoring Torque Transducers Transfer functions Spectral analysis
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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