Tracking or rejection of unknown exogenous signals with known generating dynamics is of major concern in feedback control design. Linear feedback control based on the internal model principle achieves asymptotic performance for linear systems with linear exogenous signal dynamics. This paper presents a control design based on the internal model principle to track or reject nonlinear exogenous s...

Abstruct-In tbis paper, we formulate the problem of optimal disturbance rejection in the case where the disturbance is generated as the output of a stable system in response to an input which is assumed to be of unit amplitude, but is otherwise arbitrary. The objective is to choose a controller that minimizes the maximum amplitude of the plant output in response to such a disturbance. Mathemat...

Nonlinear behavior and disturbance sensitivity of the blood pressure processes cause them to be known as an appropriate test bench for advanced control approaches. Because of special behavior and varying parameters of blood pressure processes, multiple models predictive control approaches (MMPC) have the better performance than other ones from both regulation and disturbance rejection points of...

In this paper, an adaptive scheduling H∞ disturbance rejection controller is designed for a class of nonlinear Markov jump systems with nonhomogeneous Markov jump process, in which the transition probabilities are time-varying. To estimate and reject the disturbance, a disturbance observer is considered, such that a disturbance rejection state-feedback control law is designed. Under the designe...

By revealing the deficiency of existing internal model control (IMC) based methods for load disturbance rejection for integrating processes with slow dynamics, a modified IMC design is proposed to deal with step or ramp type load disturbance as often encountered in practice. The controller parametrization is based on a two-degree-of-freedom (2DOF) control structure which allows for independent ...

Electric wheelchairs (EW) experience various terrain surfaces and slopes as well as occupants with diverse weights. This, in turn, imparts a substantial amount of perturbation to the EW dynamics. In this paper, we make use of a two-degree-of-freedom control architecture called disturbance observer (DOB) which reduces sensitivity to model uncertainties, while enhancing rejection of disturbances ...