This paper is devoted to the construction of a hierarchical observer for a linear time variant system. It presents an extension of the Output Integral Sliding Mode observer to the time variant case, and gives an algebraic procedure in order to reconstruct the state right after the first moment, if we assume that the sliding mode exist and the equivalent control is available

in this paper, under the existence of system uncertainties, external disturbances, and input nonlinearity, global finite time synchronization between two identical attractors which belong to a class of second-order chaotic nonlinear gyros are achieved by considering a method of continuous smooth second-order sliding mode control (hoamsc). it is proved that the proposed controller is robust to m...

This paper presents a brief study on the design and performance comparison of conventional first-order and super-twisting second-order sliding mode observers for some nonlinear control systems. Estimation accuracy, fast response, chattering effect, peaking phenomenon and robustness are considered for nonlinear systems under observer-based output feedback control and state feedback control.

This work deals with the design of a FDI scheme on the basis of sliding mode techniques for a 3 three tanks system. More precisely, we focus on the design of high-order sliding mode observer to estimate the magnitude of the actuator faults. The main advantage of the use of high order sliding mode techniques is that it allows to avoid the chattering phenomenon which is inherent to the classical ...

In this works, we use the approach based on observers such as the Luenberger observer and the sliding mode observer in order to introduce the diagnosis of nonlinear systems. The robustness of the proposed observers is tested through a physical example. The obtained results show that for non linear systems the performances of sliding mode observer observer is better than using a classic kind of ...

In this thesis, model based fault detection, isolation, and estimation problem in several classes of nonlinear systems is studied using sliding mode and learning approaches. First, a fault diagnosis scheme using a bank of repetitive learning observers is presented. The diagnostic observers are established in a generalized observer scheme, and the observer inputs are repetitively updated using t...

The concept of sliding mode control [11, 27, 32] has been extended to the problem of the state estimation by an observer, both for linear [10, 32] and nonlinear systems [1, 8, 28, 34]. Using the same design theory as variable structure control laws, the observer trajectories are constrained to evolve after a finite time on a suitable sliding manifold, by the use of a discontinuous output inject...

A second order sliding mode (SOSM) approach is proposed for orbital stabilization of a friction pendulum, operating under uncertain conditions. Only position measurements are assumed to be available. A SOSM velocity observer is developed and included into the closedloop system, driven by the quasihomogeneous controller that provides orbital stabilization of the pendulum. Performance issues of t...