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2 International Journal of Applied Mathematics and Computer Science

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Supervisory fault tolerant control with integrated fault detection and isolation: a switched system approach

Yang H., Jiang B., Cocquempot V., Lu L.

International Journal of Applied Mathematics and Computer Science

2012

Vol. 22, no. 1

87-97

This paper focuses on supervisory fault tolerant control design for a class of systems with faults ranging over a finite cover. The proposed framework is based on a switched system approach, and relies on a supervisory switching within a family of pre-computed candidate controllers without individual fault detection and isolation schemes. Each fault set can be accommodated either by one candidate controller or by a set of controllers under an appropriate switching law. Two aircraft examples are included to illustrate the efficiency of the proposed method.

Lqr-Based Nonlinear Tuning Relay Control Design With Fast Convergence

Yu X., Xia Y., Ledwich G., Oghanna W.

International Journal of Applied Mathematics and Computer Science

1999

Vol. 9, no 2

313-326

In this article, we present a relay control scheme based on LQR design with fast convergence. This scheme provides a practical and simple way to achieve fast convergence based on the well-known LQR design principle. The controller is a global stabiliser in the sense that for any given initial condition, we can always initialize the controller to drive the system to reach the origin. This controller is tunable in accordance with the position of the system state: the closer to the origin, the larger the control gains, which results in a fast control that maintains bounded control magnitude. It has also been shown that setting matrix Q can significantly influence the tendency of eigenvalues to switch the hyperplane. The relation between matrix Q and the tendency of those eigenvalues has been identified. Simulation results are presented to demonstrate the effectiveness of the scheme.