Internal dissipation and self-excited ocillations in rotating machinery: internal friction vs. internal viscous damping

Abstract : Destabilization due to co-rotating internal viscous damping is a very well known phenomenon. However, most practical applications in engineering do rather exhibit frictional damping (stemming from joints, etc.) instead of velocity proportional dissipation. This contribution aims on investigating the basic effects of internal damping due to co-rotaing frictional dissipation and the interaction with external damping. It is found that adding internal friction damping alters the dynamical behavior significantly: the threshold rotation speed depending on De/Di known from the linear problem is replaced by self-excited vibrations due to the frictional damping which occur between the resonance speed and the linear threshold speed and which grow hyperbolically as the linear threshold speed is approached. However, the result of the linear analysis is still meaningful since it marks the maximum speed until which finite amplitudes are to be expected.
Keywords : Joint damping Friction
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Hartmut Hetzler, Felix Boy. Internal dissipation and self-excited ocillations in rotating machinery: internal friction vs. internal viscous damping. International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC 2017), Dec 2017, Maui, United States. ⟨hal-02349538⟩

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