Development of robust intelligent tracking control system for uncertain nonlinear systems using H∞ control technique

Intelligent complementary sliding-mode control with dead-zone parameter modification

“…The robust compensator is designed as (32), thus (43) is exactly the same as (33). Therefore, the proposed ICSMC system without parameter adaptations still has the finite 2 L -gain property when tracking performance index is smaller than performance threshold.…”

“…attenuation constant  can be specified by the designer to achieve the desired attenuation ratio between || || c s s  and || || [31][32][33]. , the 2 L -gain inequality(34) can be given as…”

Robust Fuzzy Digital PID Control for Uncertain Dynamic Systems with Time Delay

“…The controller is designed to make the control system stable, in spite of the uncertainties or parametric changes in the plant to be controlled, so as to establish tracking of the reference trajectory within the frequency range of interest. Since designers and engineers need to deal with industrial plants increasingly complex, taking into account structural and dynamic features such as nonlinearities, uncertainties, parametric variations, time delay, among others, several methods of robust control has been proposed, allowing in their formulation the use of constraints and performance requirements [1] [2][3] [4][5] [6]. In [7], the stabilization of a discrete time robust control system based on reference model, is achieved.…”