A damage detection method based on an innovative 2D phased sensor array made of
piezoelectric paint is proposed for in situ damage detection of a thin isotropic panel using
guided Lamb waves. A design analysis of candidate 2D arrays based on spiral,
cruciform and circular element layouts is performed. In this study, a 2D phased sensor
array with a spiral configuration is fabricated using a piezoelectric composite
(piezopaint) patch and used for detecting damages in an aluminum panel. Steered array
responses are generated from the raw sensor signals using a directional filtering
algorithm based on phased array signal processing. The fundamental flexural
(or transverse), A0 mode, of the guided Lamb waves is used though the sensing
and analysis technique is not limited to the mode used in this work. To enhance
the proposed analysis technique, empirical mode decomposition (EMD) and a
Hilbert–Huang transform (HHT) are applied. A new damage detection algorithm
including threshold setting and damage index (DI) calculation is developed and
implemented for detecting damages in the form of holes and a simulated crack.
The characteristic damage indices consistently increase as damage size grows.
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