Method and apparatus for estimating damage in a structure
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United States of America Patent
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Aug 27, 2013
Grant Date -
Feb 17, 2011
app pub date -
Aug 13, 2010
filing date -
Aug 13, 2009
priority date (Note) -
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Abstract
Detecting damage in a structure without comparing sensor signals to a baseline signal. Once a structure is interrogated, a process based on a Gaussian Mixture Model is applied to the resulting data set, resulting in quantities for which Mahalanobis distances and Euclidian distances can be determined. A damage index is then determined based on the calculated Euclidian distance. A high value of this damage index coupled with an abrupt change in Mahalanobis distance has been found to be a reliable indicator of damage. Other embodiments may employ a baseline, but determine damage according to ratios of energy values between current and baseline signals.
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