Probabilistic fault recoverability analysis of flight control process

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Probabilistic Fault Recoverability (FR) property reveals the capability of a system to accommodate faults under admissible input energy constraints in the sense of satisfactory probabil-ity. Motivated by the idea of probabilistic control methods, a class of admissible probability density functions is designed for detailed description of fault parameters, under which several probabilistic FR conditions are established. This significantly enlarges the range of recoverable faults obtained from the deterministic FR analysis. The tradeoffs between the risk of performance degradation and this increased recoverability margin are exactly achieved by allowing a small risk of FR viola-tion. This paper analyzes the probability FR of dynamic systems with switching and interconnec-tion characteristics, and applies the new results to several aircraft models including single longitudinal aircraft dynamic, Highly Maneuverable Technology (HiMAT) vehicle and meta air-craft. Simulation results show the efficiency of the proposed methods based on the comparison between deterministic and probabilistic cases.
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