Shock and Vibration

Research Article

Chaotic Vibration Analysis of the Bottom Rotating Drill String

Figure 2

Time series and spectral density estimation (the top plane is produced from the signal of lateral vibration and the bottom plane is produced from the signal of longitudinal vibration).
429164.fig.002a
(a) Time series of
429164.fig.002b
(b) Spectral density estimation of
429164.fig.002c
(c) Time series of
429164.fig.002d
(d) Spectral density estimation of