Accepting performance degradation in fault-tolerant control system design

• Published in: IEEE transactions on control systems technology Vol. 14; no. 2; pp. 284 - 292
• Main Authors: Jin Jiang, Jin Jiang, Youmin Zhang, Youmin Zhang
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Actuators; Aircraft; Applied sciences; Automatic control; Computer science; control theory; systems; Control system synthesis; Control systems; Control systems design; Control theory. Systems; Controllers; Degradation; Dynamical systems; Exact sciences and technology; Failure; Fault detection and diagnosis (FDD); Fault tolerance; Fault tolerant systems; fault-tolerant control systems (FTCS); Mathematical models; Mechanical engineering. Machine design; Modelling and identification; multiple-model; Performance degradation; Process design; reconfigurable control; Sensor phenomena and characterization; Sensor systems; Multimodel control; fault-tolerant control systems (FTCS); Control synthesis; multiple-model; reconfigurable control; Dynamical system; performance degradation; Fault detection and diagnosis (FDD); Modeling; Reference model; Simulation; Performance requirement; actuator saturation; Aircraft; Monitoring control system; Fault diagnostic; Measurement error; Fault tolerant system; Defect detection; Reconfiguration
• ISSN: 1063-6536; 1558-0865
• DOI: 10.1109/TCST.2005.860515

A novel fault-tolerant control system design technique has been proposed in this paper, which blends the multiple-model principle with the unavoidable performance degradation due to faults in actuators, sensors or system dynamics. The number of models employed depends on the characteristics of the system, the nature of the failures considered, and the physical limits of system variables. The achievable performance under various component failures are represented in the form of reference models, known as performance reduced reference models. These models are used to synthesize a set of controllers. Under a specific fault condition, proper controller and revised control system command input are selected automatically to achieve desired performance. A simulation example of an aircraft subject to different type of failures has been used to illustrate the design process and to demonstrate the effectiveness of the method.