Abstract
Local resonances, formed by zero-group velocity (ZGV) and cutoff frequency points, have been extensively studied using impulse induced by pulsed lasers and impacts. In this work, we demonstrated the effectiveness of the electromechanical impedance (EMI) technique in extracting ZGV and cutoff frequency resonance in a rectangular aluminum bar. We identified the mechanisms of multiple resonances in the EMI spectra through the analysis of dispersion relations. Moreover, we extracted the spatial wave profile at a cutoff frequency and a ZGV frequency to confirm the localized energy behavior in the vicinity of the excitation source.
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