Some unknown elements always exist in the analysis process for the control systems, such as unmodeled dynamics, parametric uncertainties, change of the operating environment, model reduction and linearization approximations, etc., or external disturbance. So it is significative to study the disturbance process or the uncertain systems. The emergence and the development of the robust control the...

A class of adaptive disturbance tracking controllers (ADTCs) is augmented with disturbance and state estimation and adaptive state feedback, in which a controller and estimator, which are designed on the basis of a lower-order model, are used to control a higher-order nonlinear plant. The ADTC requires that the plant be almost strict positive real (ASPR) to ensure stability. In this paper, we s...

This paper proposes a new approach to solve the problem of designing optimal proportional-integral-derivative (PID) controllers that minimize an H2-norm associated with the set-point response while subjecting to an H∞-norm on the load disturbance rejection. The proposed design approach consists of constructing the feasible domain in the controller gain space and searching over the domain the op...

Optimal and robust control theories are used to determine eeective, estimator-based feedback control rules for laminar plane channel ows that eeectively stabilize linearly unstable ow perturbations at Re = 10; 000 and linearly stable ow perturbations, characterized by mechanisms for very large disturbance ampliication, at Re = 5; 000. Wall transpiration (unsteady blowing/suction) with zero net ...

Aiming at the problem that trajectory tracking error of flexible lower limb exoskeleton robot is too large under condition external disturbance and parameters uncertainty, a composite position control method based on second-order sliding mode was proposed. Firstly, modeled by Lagrange function. Secondly, considering system affected not only matched but also unmatched disturbance, two finite tim...

A Smith-Dynamic Matrix Control ( DMC ) -PID SDP control method based on disturbance observer is devised for the temperature regulation of a reactor with high lag and nonlinear features. This results in poor system stability low precision. In first place, because prone to receiving external disturbances generated by changes, which ultimately leads significant impact inside kettle, introducing PI...

in this paper, an observer based fuzzy adaptive controller (fac) is designed fora class of large scale systems with non-canonical non-affine nonlinear subsystems. it isassumed that functions of the subsystems and the interactions among subsystems areunknown. by constructing a new class of state observer for each follower, the proposedconsensus control method solves the problem of unmeasured sta...

This manuscript addresses trajectory tracking problem of autonomous underwater vehicles (AUVs) on the horizontal plane. Adaptive sliding mode control is employed in order to achieve a robust behavior against some uncertainty and ocean current disturbances, assuming that disturbance and its derivative are bounded by unknown boundary levels. The proposed approach is based on a dual layer adaptive...