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Shows that a rotor with possible contacts with an outer stator can experience ongoing impacting oscillations - and that this is a form of internal resonance in the rotating coordinate frame. This leads to very rich dynamical phenomena, and the insights could be used to explain many phenomena in the vibrations of rotating machinery.

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This page is a summary of: Asynchronous partial contact motion due to internal resonance in multiple degree-of-freedom rotordynamics, Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences, August 2016, Royal Society Publishing,
DOI: 10.1098/rspa.2016.0303.
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