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The paper presents the development of a fault detection and diagnosis (FDD) system with applications to the Space Shuttle main engine. The FDD utilizes a model-based method with real-time identification and hypothesis testing for actuation, sensor, and performance degradation faults.

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Abstruct-This paper considers the disturbance decoupling problems, with or without internal stability and pole placement, via dynamic output feedback using polynomial and rational matrix techniques. We show that in all three problems considered, the central solvability condition can be expressed as a two-sided matching problem A = BXC, where A , B, and Care the polynomialsystem mutrices of certain natural subsystems of the system model and X is to be determined over various subrings of the rational functions. This matching problem can in turn be reduced to certain appropriate zero-cuncellution conditions on the polynomial system matrices A , B, and C.