“…undesired oscillations of the relevant signals causing vibrations and unacceptable mechanical wear (Hangos et al, 2004). A possibility to overcome this problem is to rely on high order sliding mode control (Laghrouche et al, 2007;Levant, 2005;Levant, 2001). In (Hernandez-Suarez et al, 2009) we have applied the integral high order sliding mode control (IHOSMC), to suppress stick-slip oscillation in an oil-drillstring.…”