Adaptive output feedback actuator failure compensation for a class of non‐linear systems

Abstract

An adaptive compensation control scheme using output feedback is designed and analysed for a class of non-linear systems with state-dependent non-linearities in the presence of unknown actuator failures. For a linearly parameterized model of actuator failures with unknown failure values, time instants and pattern, a robust backstepping-based adaptive non-linear controller is employed to handle the system failure, parameter and dynamics uncertainties. Robust adaptive parameter update laws are derived to ensure closed-loop signal boundedness and small tracking errors, in general, and asymptotic regulation, in particular. An application to controlling the angle of attack of a non-linear hypersonic aircraft dynamic model in the presence of elevator segment failures is studied and simulation results show that the developed adaptive control scheme has desired actuator failure compensation performance.

Robust adaptive output‐feedback control for a class of nonlinear systems with time‐varying actuator faults

“…Generally speaking, the FTC methods can be classified into two types [1,3]: passive or active approaches (see, e.g. [4][5][6] and [7][8][9][10][11][12][13][14][15][16][17][18][19], respectively).…”

“…A more complex case was investigated in [17], where an adaptive outputfeedback compensation design scheme was proposed for a class of nonlinear systems in the output-feedback form. In [18,19], the authors further studied a class of perturbed nonlinear systems by using robust adaptive control laws.…”

Robust Fault Detection and Estimation in Nonlinear Systems with Unknown Constant Time‐Delays

“…The existence of such time-delays renders the control design problem much more difficult [12]. Increasing attention has recently been devoted to stability control and fault diagnosis of linear/nonlinear time-delayed systems, see, for example, [4][5][6][11][12][13][14][15][16]. In [14], an observer-based fuzzy control scheme with adaptation to the time-delay was proposed.…”

“…FTC can be achieved either by a passive way or using an active method. Passive FTC uses feedback control laws that are robust with respect to an a priori fixed set of possible system faults [3,4]. On the other hand, active FTC uses a Fault Detection and Isolation (FDI) module that provides online fault information.…”

RBF Nonsmooth Control Method for Vibration of Building Structure with Actuator Failure

“…And many effective ways have some development in respect of compensation of actuator failure. The study of actuator failure is started with dealing with linear system fault [6,7]. Nevertheless, the control of actuator failure is very limited in the application of building structure.…”