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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
EMI response of SSU: (a) Schematic two-sided symmetry model of SSU; (b) Conductance and susceptance signatures obtained in a free–free mode of PZT sensors (without steel plate) and free–free mode SSU (with steel plate).