Abstract:The research work deals with the torsional vibration of a drill string in a vertical cylindrical cavity of a borehole with liquid medium. The mechanical interaction models of the drill string with viscous liquid are investigated,
Also this paper describes the vibrations of the drill string bit with allowance made for viscous friction, the nonlinear deferential equation with partial derivatives is used. The oscillation scheme of torsional auto-vibration of homogeneous drill string in the form of oscillation pen… Show more
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