The whirling vibrations of a rotating drillstring bottom-hole assembly subject to the moment of friction are analyzed qualitatively. A problem statement and solution are given. The self-excitation of vibrations is simulated. It is established that during the self-excitation of whirling vibrations, the axial line of the drill bit can slowly and rapidly move over intricately shaped nonsmooth conical surfaces
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Translated from Prikladnaya Mekhanika, Vol. 49, No. 3, pp. 114–124, May–June 2013.
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Gulyaev, V.I., Lugovoi, P.Z. & Borshch, E.I. Self-excited vibrations of a drillstring bit. Int Appl Mech 49, 350–359 (2013). https://doi.org/10.1007/s10778-013-0573-y
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DOI: https://doi.org/10.1007/s10778-013-0573-y