6533b7d6fe1ef96bd126666f

RESEARCH PRODUCT

Optimal measurement setup for damage detection in piezoelectric plates

Roberto PalmaJosé Luis Pérez AparicioPaloma MassóGuillermo RusRoberto Palma Guerrero

subject

MECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURASPiezoelectric sensorMechanical EngineeringNumerical analysisGeneral EngineeringSystem identificationInverse problemProbability of detectionFinite element methodMechanics of MaterialsSearch algorithmFinite Element MethodInverse problemIdentifiabilityGeneral Materials SciencePiezoelectricGradient methodAlgorithmMathematics

description

[EN] 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 phi 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. (c) 2008 Elsevier Ltd. All rights reserved.

yearjournalcountryeditionlanguage
2009-04-01International Journal of Engineering Science
https://doi.org/10.1016/j.ijengsci.2008.09.006