Local resonances, formed by zero-group velocity (ZGV) and cutoff frequency points, have been extensively studied using impulse-based approaches, such as pulse laser and impact echo. In this work, we showcase the electromechanical impedance (EMI) technique as an option to extract and promote zero-group velocity and cutoff frequency resonances in a waveguide structure. We identify the mechanisms of multiple resonances in the EMI spectra via a wave propagation perspective. Furthermore, we extract the dynamic response profiles at a cutoff frequency and a ZGV frequency to confirm the localized minimum frequency behavior within corresponding branches.

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Keping Zhang, Ranting Cui, Yuning Wu, and Xuan Zhu, "Promoting local resonances in waveguide structures using the electromechanical impedance method," Proc. SPIE 12488, Health Monitoring of Structural and Biological Systems XVII, 124880I (Presented at SPIE Smart Structures + Nondestructive Evaluation: March 14, 2023; Published: 25 April 2023); https://doi.org/10.1117/12.2657756.