In this work, the identification of rigid-body mode shapes is addressed within the framework of experimental modal analysis. The modal identification procedure enables the estimation of lower residuals in the admittance matrix, for which two decomposition approaches were examined: one based on theoretically predicted rigid-body modes, and the other relying on singular value decomposition. The developed procedures were first validated on a numerical model of a free-free beam and subsequently applied to an experimental case. The results were evaluated using rigid-mode basis adequacy criteria. The findings confirm that both tested approaches enable effective decomposition of rigid-body modes and extend the existing capabilities of the employed software tool.
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