This paper is concerned with the output feedback control design for a class of nonlinear uncertain systems subject to multiple sources of disturbances including model uncertainties, unknown constant disturbances, harmonic disturbances with unknown frequency and amplitude. The total disturbances and uncertainties are delicately represented by a compact exogenous model first. By incorporating the...

Robust control problem of a class of uncertain systems that have disturbances and uncertainties not satisfying “matching” condition, is investigated in this paper via a disturbance observer based control (DOBC) approach. In the context of this paper, “matched” disturbances/uncertainties refers to the disturbances/uncertainties enter the system through the same channels as the control inputs. By...

Robust control of a class of uncertain systems that have disturbances and uncertainties not satisfying "matching" condition is investigated in this paper via a disturbance observer based control (DOBC) approach. In the context of this paper, "matched" disturbances/uncertainties stand for the disturbances/uncertainties entering the system through the same channels as control inputs. By properly ...

This paper investigates the formation keeping problem of heterogeneous ships with underactuated inputs, uncertain dynamics, and environmental disturbances. The control objective is to make followers keep desired while tracking a leader. To solve effectively, novel virtual leader–follower scheme considering ship heterogeneity proposed by utilizing backstepping method, adaptive neural network, la...

In this paper, we consider the hierarchical control problem for a class of uncertain hybrid dynamical systems. The continuous dynamics of this class of uncertain hybrid systems are described by linear difference state equations, whose right side functions are unknown but lie within some convex hulls of known functions. Our control objective is for the closed loop system to exhibit a desired beh...

the networked control system in modern control widely uses to decrease the implementation cost and increasing the performance. ncs in addition to its advantages is inevitable. nevertheless they suffer of some limitations and deficiencies. packet loss is one of the main limitations which affect the control system in different conditions and finally may lead to system instability. for this reason...

Severe geomagnetic disturbances (GMDs) increase the magnitude of electric field on Earth’s surface (E-field) and drive geomagnetically-induced currents (GICs) along transmission lines in grids. These additional can pose severe risks, such as current distortions, transformer saturation increased reactive power losses, each which lead to system unreliability. Several mitigation actions (e.g., cha...