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Mathematical Problems in Engineering
Volume 2013, Article ID 218026, 10 pages
Research Article

A Three-Dimensional Model of the Effective Electromechanical Impedance for an Embedded PZT Transducer

Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China

Received 15 October 2013; Accepted 4 December 2013

Academic Editor: Ting-Hua Yi

Copyright © 2013 Chunyuan Zuo et al. 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.


A three-dimensional model of the effective electromechanical impedance for an embedded PZT transducer is proposed by considering the interaction between a PZT patch and a host structure. By introducing an effective mechanical impedance, the coupled electromechanical admittance formulations are derived using the piezoelectric constitutive equations. Then, a modified methodology for monitoring structure changes using an electromechanical impedance (EMI) technique is proposed. In the proposed method, the changes in the host structure are monitored by using the “active” part associated with the structural mechanical impedance, which is extracted from the measured raw admittance signatures. The strength gain of a concrete beam with embedded PZT transducers during the curing age was monitored with the proposed methodology. The experimental results demonstrate that the use of the “active” part is more sensitive as opposed to the raw admittance signatures for structural health monitoring (SHM).