Feedback linearization designs for uncertain nonlinear time-delay processes: A comparative study

This work concerns the phenomena in which the feedback linearization contro l is applied to uncertain nonlinear time-delay processes. Under the I/O lin earization algorithm, both nonlinear controllers are used to stabilize the closed-loop system with transformed delay inputs. When the effect of input perturbations can converge to zero or asymptotically vanish, these nonlinea r feedback designs with only an adjustable parameter can directly improve t he tracking performance. The simple linearizing controller can directly reg ulate the system output at unstable operating point. Combined with deadtime compensation the nonlinear predictive controller with the aid of appropria te state prediction is valid for the real process in the presence of large time delay. Finally, via computer simulation and test of control ability of both feedback control designs the useful comparative results are presented .