The paper is focused on a problem of flexural vibrations of a rotating drillstring bottom hole assembly under the action of the friction (cutting) moment. The mechanism of self-excitation of the vibrations has been analyzed. The induced moment is shown to be nonconservative and represents the main source of dynamic instability of the system. The flexural mode shapes of the drillstring bottom hole assembly motion have been plotted for various values of the characteristic parameters.
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Translated from Problemy Prochnosti, No. 6, pp. 13–25, November–December, 2010.
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Gulyaev, V.I., Khudolii, S.N. & Borshch, E.I. Wirl vibrations of the drillstring bottom hole assembly. Strength Mater 42, 637–646 (2010). https://doi.org/10.1007/s11223-010-9252-y
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DOI: https://doi.org/10.1007/s11223-010-9252-y