Structural Health Monitoring Using High-Frequency Electromechanical Impedance Signatures

Abstract EN

An overview of recent advances in electromechanical impedance- (EMI-) based structural health monitoring is presented in this paper.

The basic principle of the EMI method is to use high-frequency excitation to sense the local area of a structure.

Changes in impedance indicate changes in the structure, which in turn indicate that damages appear.

An accurate EMI model based on the method of reverberation-ray matrix is introduced to correlate changes in the signatures to physical parameters of structures for damage detection.

Comparison with other numerical results and experimental data validates the present model.

A brief remark of the feasibility of implementing the EMI method is considered and the effects of some physical parameters on EMI technique are also discussed.