576709.fig.006a
(a)
576709.fig.006b
(b)
576709.fig.006c
(c)
576709.fig.006d
(d)
Figure 6: Adaptive sliding mode control of the fractional Chen’s system with dynamics uncertainty and external disturbance with simulation time and time step : (a) the space; (b) the space; (c) the space; (d) the space; (e) online estimate of ; (f) online estimate of .