Robust composite nonlinear feedback control based on integral sliding-mode control of uncertain time-delay systems under input saturation

Abstract

In this research, based on the integral sliding-mode scheme, a robust composite nonlinear feedback (CNF) control is addressed for time-delayed uncertain systems. Such an uncertain system may contain some complexities like time-varying delays, actuators saturation, and exterior disturbances. Hence, the tracking problem would be solved under the mentioned constraints. Thus, for achieving these goals, the tracking problem is firstly formulated by considering system’s limitations. The controller parameters may be determined via a solution for linear matrix inequality. As a result, the CNF tracker law is numerically simulated in some control cases. The simulation outcomes are compared with a similar technique in terms of the transient response, boundedness of the error, and the disturbance rejections. Thus, the findings illustrate the efficiency of the advised CNF control method comparing to the recent technique.

Observer-based integral controller using composite nonlinear feedback for saturated control systems

“…In recent years, several CNF controllers have been developed aiding sliding-model control (SMC). Based on the integral SMC, a robust CNF controller is suggested to uncertain systems with input saturation (Hu et al, 2022). In the presence of disturbance, based on CNF, an adaptive integral SMC is designed for controlling the position (Chen et al, 2022).…”

Robust integral controller design based on composite nonlinear feedback in uncertain systems with constrained inputs and external disturbances

“…The PI controller coupled with Smith predictor is investigated for high‐order systems 28 . A robust CNF control based on integral sliding‐mode is designed for uncertain delayed systems under input saturation 29 . Lately, employing the CNF idea, an output‐feedback integral controller is developed for linear systems with saturation 30 …”

“…28 A robust CNF control based on integral sliding-mode is designed for uncertain delayed systems under input saturation. 29 Lately, employing the CNF idea, an output-feedback integral controller is developed for linear systems with saturation. 30 More broadly, employing linear matrix inequality (LMI), many control problems like the stability analysis and the controller synthesis may be converted to an optimization.…”