An alternative characterization of bit-sticking phenomena in a multi-degree-of-freedom controlled drillstring

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Probabilistic model identification of the bit–rock-interaction-model uncertainties in nonlinear dynamics of a drill-string (2010, methodology): “There are different models in the literature for the bit-rock interaction, for example, autonomous models (Challamel (2000); Navarro-Lopez (2009); Tucker and Wang (2003)) or the distributed delay model (Germay et al. (2009)).”
Suppression of drill-string stick–slip vibration by sliding mode control: Numerical and experimental studies (2018, background): “The number of disks varies in those studies, for example, 2 disks [13], 3 disks [11, 14], 4 disks [15] and even 18 disks [16].”