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Accession Number
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ADA564933
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Title
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Statistical Analysis of Eddy Current Data from Fastener Site Inspections (Preprint).
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Publication Date
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Jul 2012
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Media Count
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24p
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Personal Author
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I. Park J. C. Aldrin J. S. Knopp R. V. Grandhi
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Abstract
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Recent work on reliably detecting and characterizing cracks in multi- layer airframe structures has used modeling and simulation to extract features from raw eddy current data, and to assist in the evaluation of probability of detection (POD). This paper focuses on the statistical analysis of the data from these studies. Hit/miss, linear, and physics-inspired methods are employed to evaluate POD. The Box-Cox transformation is used as a remedy for violations of homoscedasticity. In addition, a bootstrapping method is introduced for confidence bound calculation on a 2nd order linear model. The objective of this work is to provide on insight how different models and assumptions impact POD evaluation.
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Keywords
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Airframes
Box cox transformation
Crack propagation
Eddy currents
Inspection
Nondestructive testing
Probability of detection
Reliability
Statistical analysis
Transformations
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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72F - Statistical Analysis
46 - Physics
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Corporate Author
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Air Force Research Lab., Wright-Patterson AFB, OH. Materials and Manufacturing Directorate.
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Document Type
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Technical report
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Title Note
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Interim rept. 1 Jun-1 Jul 2012.
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NTIS Issue Number
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1304
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Contract Number
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N/A
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