Shock and Vibration / 2016 / Article / Fig 8

Research Article

Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String

Figure 8

Bifurcation of the resonance frequency-multiplier.
(a) Bifurcation diagram of the axial modal
(b) Bifurcation diagram of the torsional modal