COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 26(4), 1081–1094p. (2007) DOI:10.1108/03321640710756401

Dynamical analysis for flaw shape identification in non linear eddy current tests

M. Cacciola, D. Costantino, F. C. Morabito, M. Versaci

Purpose - The paper seeks to propose a specific approach based on Dynamic Analysis and Chaos Theory aiming to emphasize the differences into the eddy current signals obtained by related non-destructive tests, when the inspected specimens have flaws with different shapes.

Design/methodology/approach - Non-linear eddy current analysis is very useful for flaw detection in many in-service inspections. State-of-the-art technologies allow one to define position and depth of defects, but the shape identification is still an open problem. In this paper, experimental data have been subjected to a dynamical analysis in order to relate the trend of eddy current signals to the shape of analyzed defect.

Findings - In particular, a dynamical reconstruction by means of recurrence plots (RPs) has been carried out in order to detect analogies and differentiations between different eddy current signals. Moreover, cross-correlation between RPs of a reference benchmark and testing eddy current signals has been applied in order to emphasize a different dynamical behaviour and to detect a particular flaw's shape. In this way, a real-time algorithm for defect shape classification has been performed.

Originality/value - Proposed approach is very interesting, and it is an innovation in non-destructive testing procedures. In fact, the shape identification of a flaw is still an open challenge. The proposed approach, based on dynamic analysis, gives the key to solve this particular ill-posed problem, by introducing a relation between the eddy current measurements and the shape of defect existing in the inspected specimen. Very interesting preliminary results have been obtained.

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