Optimal measurement setup for damage detection in piezoelectric plates |
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Authors: | G. Rus R. Palma |
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Affiliation: | a Structural Mechanics and Hydraulic Engineering, University of Granada, Spain b Structural Mechanics, Polytechnical University of Valencia, Spain |
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Abstract: | An optimization of the excitation-measurement configuration is proposed for the characterization of damage in PZT-4 piezoelectric plates, from a numerical point of view. To perform such an optimization, a numerical method to determine the location and extent of defects in piezoelectric plates is developed by combining the solution of an identification inverse problem, using genetic algorithms and gradient-based methods to minimize a cost functional, and using an optimized finite element code and meshing algorithm. In addition, a semianalytical estimate of the probability of detection is developed and validated, which provides a flexible criterion to optimize the experimental design. The experimental setup is optimized upon several criteria: maximizing the probability of detection against noise effects, ensuring robust search algorithm convergence and increasing the sensitivity to the presence of the defect. The measurement of voltage ? is concluded to provide the highest identifiability, combined with an excitation of the specimen by a mechanical traction transverse to the polarization direction. Sufficient accuracy is predicted for the damage location and sizing under realistic noise levels. |
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Keywords: | Piezoelectric Finite Element Method Inverse problem Probability of detection |
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