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Sensors 2008, 8(11), 6846-6859; doi:10.3390/s8116846

Effect of External Vibration on PZT Impedance Signature

*  and
School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
* Author to whom correspondence should be addressed.
Received: 8 August 2008 / Revised: 24 October 2008 / Accepted: 31 October 2008 / Published: 1 November 2008
(This article belongs to the Special Issue Sensor Algorithms)
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Piezoelectric ceramic Lead Zirconate Titanate (PZT) transducers, working on the principle of electromechanical impedance (EMI), are increasingly applied for structural health monitoring (SHM) in aerospace, civil and mechanical engineering. The PZT transducers are usually surface bonded to or embedded in a structure and subjected to actuation so as to interrogate the structure at the desired frequency range. The interrogation results in the electromechanical admittance (inverse of EMI) signatures which can be used to estimate the structural health or integrity according to the changes of the signatures. In the existing EMI method, the monitored structure is only excited by the PZT transducers for the interrogating of EMI signature, while the vibration of the structure caused by the external excitations other than the PZT actuation is not considered. However, many structures work under vibrations in practice. To monitor such structures, issues related to the effects of vibration on the EMI signature need to be addressed because these effects may lead to misinterpretation of the structural health. This paper develops an EMI model for beam structures, which takes into account the effect of beam vibration caused by the external excitations. An experimental study is carried out to verify the theoretical model. A lab size specimen with different external excitations is tested and the effect of vibration on EMI signature is discussed.
Keywords: PZT; electromechanical impedance; structural health monitoring; vibration PZT; electromechanical impedance; structural health monitoring; vibration
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Yang, Y.; Miao, A. Effect of External Vibration on PZT Impedance Signature. Sensors 2008, 8, 6846-6859.

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