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Sensors 2018, 18(5), 1521; https://doi.org/10.3390/s18051521

Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework

Air Force Institute of Technology, ul. Ks, Boleslawa 6, 01-494 Warszawa, Poland
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Received: 13 March 2018 / Revised: 7 May 2018 / Accepted: 8 May 2018 / Published: 11 May 2018
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
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Abstract

One of the ideas for development of Structural Health Monitoring (SHM) systems is based on excitation of elastic waves by a network of PZT piezoelectric transducers integrated with the structure. In the paper, a variant of the so-called Transfer Impedance (TI) approach to SHM is followed. Signal characteristics, called the Damage Indices (DIs), were proposed for data presentation and analysis. The idea underlying the definition of DIs was to maintain most of the information carried by the voltage induced on PZT sensors by elastic waves. In particular, the DIs proposed in the paper should be sensitive to all types of damage which can influence the amplitude or the phase of the voltage induced on the sensor. Properties of the proposed DIs were investigated experimentally using a GFRP composite panel equipped with PZT networks attached to its surface and embedded into its internal structure. Repeatability and stability of DI indications under controlled conditions were verified in tests. Also, some performance indicators for surface-attached and structure-embedded sensors were obtained. The DIs’ behavior was dependent mostly on the presence of a simulated damage in the structure. Anisotropy of mechanical properties of the specimen, geometrical properties of PZT network as well as, to some extent, the technology of sensor integration with the structure were irrelevant for damage indication. This property enables the method to be used for damage detection and classification. View Full-Text
Keywords: Structural Health Monitoring; PZT transducers; composite structures monitoring; damage detection Structural Health Monitoring; PZT transducers; composite structures monitoring; damage detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Dziendzikowski, M.; Niedbala, P.; Kurnyta, A.; Kowalczyk, K.; Dragan, K. Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework. Sensors 2018, 18, 1521.

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