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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/).
(a) Compact panel FRFs. The dark gray line indicates experimental FRF data, the green dotted line represents the AMI fit and the red line shows the residual (error) after refinement of a multi-mode model fit. (b) Complex plane plot of composite. H(w) is the FRF.