A THREE-DIMENSIONAL MODEL OF EFFECTIVE ELECTROMECHANICAL IMPEDANCE FOR EMBEDDED PZT TRANSDUCERS——Part Ⅰ: Theory

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (21) : 119-124.

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A THREE-DIMENSIONAL MODEL OF EFFECTIVE ELECTROMECHANICAL IMPEDANCE FOR EMBEDDED PZT TRANSDUCERS——Part Ⅰ: Theory

Zuo Chunyuan, Feng Xin, Zhou Jing

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Abstract

A three-dimensional effective electromechanical impedance model for embedded PZT transducer is proposed by considering the coupled vibration effect between the piezoelectric ceramic (PZT) patch and the host structure. The coupled electromechanical admittance equation is derived by adopting the concept of effective mechanical impedance for the piezoelectric materials. The equation contains the contributions not only from PZT but also from the host structure. The theoretical electromechanical admittance of PZT in the free-free condition can be obtained by the equation, which is then utilized to extract the effective mechanical impedance of the structure.

Key words

structural health monitoring / embedded PZT transducers / effective electromechanical impedance / coupled electromechanical admittance / electromechanical impedance (EMI) technique

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Zuo Chunyuan;Feng Xin;Zhou Jing. A THREE-DIMENSIONAL MODEL OF EFFECTIVE ELECTROMECHANICAL IMPEDANCE FOR EMBEDDED PZT TRANSDUCERS——Part Ⅰ: Theory [J]. Journal of Vibration and Shock, 2014, 33(21): 119-124