Reliability-Based Modeling & Analysis of Fault-Tolerant Flight Control Systems

This paper gives a brief tutorial on reliability modeling of safety critical systems, and discusses the control of such systems for enhancement of their safety and design lives. Fault tolerant control is tackled as a supervisory control problem of a finite state stochastic failure process. This view allows us to quantify, based on a prescribed the reliability requirement, the desired level of redundancy, the quality of redundancy management, and the effectiveness of maintenance policy. The new development with respect to our previous effort is the extension from Markov to non-Markov reliability models. Using a pitch axis control example, the benefit of using aerodynamically redundant surfaces is assessed. In addition, the effect of hardware aging, the effect of the risk in redundancy management, and the effect of frequency of maintenance are also examined.

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