Title :
Fast fault estimation and accommodation for dynamical systems
Author :
Zhang, Kai ; Jiang, Bo ; Shi, Peng
Author_Institution :
Coll. of Autom. Eng., Nanjing Univ. of Aeronaut. & Astronaut., Nanjing
fDate :
2/1/2009 12:00:00 AM
Abstract :
The problem of fast active fault-tolerant control is studied using adaptive fault diagnosis observer (AFDO). Existence conditions for linear time-invariant system are first introduced to verify whether or not the adaptive observer for fault diagnosis exists. Then a novel fast adaptive fault estimation (FAFE) algorithm is proposed to enhance the performance of fault estimation. Using the on-line obtained fault information, the observer-based fault tolerant controller based on the separation property is designed to compensate for the loss of actuator effectiveness by stabilising the closed-loop system. Furthermore, an extension to a class of nonlinear systems is extensively investigated. Finally, simulation results are presented to illustrate the efficiency of the proposed techniques.
Keywords :
adaptive control; closed loop systems; fault diagnosis; fault tolerance; linear systems; nonlinear control systems; observers; stability; active fault-tolerant control; adaptive fault diagnosis observer; closed-loop system; dynamical system; fast adaptive fault estimation; linear time-invariant system; nonlinear system; separation property; stability;
Journal_Title :
Control Theory & Applications, IET
DOI :
10.1049/iet-cta:20070283