Electromechanical impedance (EMI) technique using lead zirconate titanate (PZT) transducers has been increasingly
applied to structural health monitoring (SHM) of aerospace, civil and mechanical structures. 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 vibration of the structure caused by the external excitations has been considered only for one
dimensional scenario. This paper develops a two dimensional EMI model to account for the effect of external
excitation on the PZT admittance signature. An application is illustrated with modeling of a simply supported Kirchoff
plate interrogated by a single surface-bonded PZT transducer. Numerical simulation is also carried out to verify the
theoretical model. Finally, the effect of external excitation on PZT impedance signature is discussed.
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