• Use of the energy of parametric oscillations to improve drilling indices 

      Svitlytskyi, V; Ohorodnikov, P; Kovalchuk, Yu (National Mining University, 2018-09-30)
      Purpose. Increase of the efficiency of using energy of parametric oscillations within the assembly of drilling string bottom by means of solving nonlinear-parametric equations of a “bit – drive motor – drilled-out rock” ...