Analysis of Piezoelectric Diaphragms in Impedance-Based Damage Detection in Large Structures
São Paulo State University (UNESP), School of Engineering, Bauru
* Author to whom correspondence should be addressed.
14 November 2017
The use of low-cost transducers such as piezoelectric diaphragms in structural health monitoring (SHM) applications based on the electromechanical impedance (EMI) method has grown in recent years. Although many studies report the feasibility of such transducers for impedance-based damage detection, the experiments are typically performed on small structures. Therefore, the objective of this work is to perform an experimental analysis of the feasibility of the piezoelectric diaphragms for the detection of damage in large structures. Several tests were carried out on a large aluminum plate in which a diaphragm was attached. The electrical impedance signatures of the transducer were collected and a basic damage index was calculated in order to verify the feasibility of quantifying the size of the damage at different distances from the transducer. The experimental results indicate that the piezoelectric diaphragms have a good sensitivity to provide a damage size classification in large structures. In addition, the sensitivity to damage detection and classification decrease as the distance between the transducer and the damage increases. Therefore, the results reported in this study indicate that low-cost piezoelectric diaphragms are feasible for impedance-based SHM applications in large structures.
Piezoelectric diaphragms; low-cost; SHM; impedance; damage; large structures
Cite this article as
Budoya, D.; de Castro, B.; Campeiro, L.; Freitas, E.; da Silveira, R.; Baptista, F. Analysis of Piezoelectric Diaphragms in Impedance-Based Damage Detection in Large Structures.
In Proceedings of the 4th Int. Electron. Conf. Sens. Appl.,
15–30 November 2017;
Danilo Ecidir Budoya was born in Bauru, Brazil, in 1989. He received a B.S. degree in electrical engineering in 2016 from São Paulo State University (UNESP), São Paulo, Brazil, where he is currently working toward a Master’s degree. He is currently a researcher with the Laboratory of Transducers and Data Acquisition, Department of Electrical Engineering, UNESP, where he works in the areas of structural health monitoring, signal processing, data acquisition and electronic instrumentation.
Bruno de Castro
Bruno Albuquerque de Castro received B.S. and M.Sc. degrees in electrical engineering from UNESP—Univ. Estadual Paulista, Bauru, Brazil, in 2012 and 2016, respectively. He is currently a regular student in the Phd program Electrical Engineering at UNESP – Bauru campus with scholarship provided by São Paulo Research Foundation (Fapesp). His research field focuses is in the structural health monitoring (SHM), failures diagnostics at the civil, mechanic structural, intelligent systems, data acquisition, electronic instrumentation, acoustic emission, piezoelectricity, instrumentation and power quality.
Everaldo Silva de Freitas was born in Presidente Venceslau, Brazil, in 1978. He received a B.S. degree in Computer Engineering from the Centro Universitário de Lins (Unilins), Lins, Brazil, in 2002. Currently, he is a professor of Automation and Electrical Engineering from the Centro Universitário de Lins (Unilins), Lins, Brazil. He is a researcher with the Department of Electrical Engineering, UNESP-Univ Estadual Paulista, Bauru, Brazil, where he is working toward a M.Sc. degree in the field of structural health monitoring based on the electromechanical impedance principle using low-cost piezoelectric transducers.
Fabricio Guimarães Baptista received B.S. and Ph.D. degrees in electrical engineering from UNESP – Univ. Estadual Paulista, Ilha Solteira, Brazil, in 2006 and 2010, respectively.
From 2010 to 2011, he was a Visiting Scholar at the Center for Intelligent Material Systems and Structures (CIMSS), Virginia Tech, Blacksburg, VA, performing research in the field of structural health monitoring and piezoelectric transducers. He is currently an Assistant Professor in the Department of Electrical Engineering, UNESP, Bauru, where he coordinates the Laboratory of Transducers and Data Acquisition, working in the field of piezoelectricity, structural health monitoring, signal processing, data acquisition, and electronic instrumentation.