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

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/sv/volume-2016/1646814/figures/1646814.fig.008a.svgz" name="1646814.fig.008a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Bifurcation diagram of the axial modal</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/sv/volume-2016/1646814/figures/1646814.fig.008b.svgz" name="1646814.fig.008b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Bifurcation diagram of the torsional modal</td></tr></table>

<div>Bifurcation of the resonance frequency-multiplier.</div>

Shock and Vibration

fig8

Figure 8

Figure 8: Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String 