By Prof. Mufeed M. Mahmoud, Prof. Jin Jiang, Prof Youmin Zhang (auth.)
Modern technological structures depend on refined keep watch over features to fulfill elevated functionality requisites. For such platforms, Fault Tolerant regulate platforms (FTCS) have to be constructed. lively FTCS are depending on a Fault Detection and identity (FDI) technique to observe process functionality and to realize and isolate faults within the structures. the most target of this e-book is to review and to validate a few very important concerns in real-time energetic FTCS through theoretical research and simulation. a number of versions are offered to accomplish this goal, making an allowance for functional features of the process to be managed, functionality deterioration in FDI algorithms, and boundaries in reconfigurable keep an eye on laws.
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Extra info for Active Fault Tolerant Control Systems: Stochastic Analysis and Synthesis
The subject of this book falls within the area of AFTCS that are modelled by stochastic linear di erential equations with randomly varying parameters. Random parameters are due to random faults that may occur and the non-deterministic nature of the FDI algorithms. The random nature of the FDI process can be assumed to have a strong Markovian characteristics. A primary concern, in this book, is the faults in system actuators and plant components. Sensors integrity is assumed in all work completed.
Moreover, the joint process fx g = fx(t) (t) (t)g is a Markov process in the interval I = to tf _ --, : , :-: . To illustrate the Markovian property, consider to s t 2 I then x(t) is determined uniquely by x(s), (w) and (w) for s w t. Since and are Markov processes, (w) and (w) for w s are independent of (w~) and (w~) for w~ < s when conditioned on (s) and (s). It follows that (x(t) (t) (t)) is independent of the random variables (x(w~) (w~) (w~)) when conditioned on (x(s) (s) (s)). Considering linear dynamical systems, the state space representation will be x(t) = A(t)x(t) + B ( (t))u(x(t) t t) ( ) (4.
In the rst case, a FTCS could have been designed to lead to a safe shutdown of the reactor. In the second case, the malfunction of the IRU could be 6 CHAPTER 1. INTRODUCTION considered as a sensor fault and a voting mechanism could have been implemented to perform a consistency check of the attitude information against the expected attitude. 3 Advances in Fault Tolerant Control Systems As mentioned previously, the main task in FTCSs is the design of a controller to guarantee the system stability and acceptable performance, not only when the system is fault-free but also when there is a component malfunction (sensor, actuator, plant component, or any combination).