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Using measured amplitudes of a rotating shaft at various speeds it is straightforward to recast the data such that it can be plotted as a straight line with a slope corresponding to the critical speed of the shaft.

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This page is a summary of: Predicting critical speeds in various rotordynamics problems, Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science, July 2016, SAGE Publications,
DOI: 10.1177/0954406216659680.
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