The Logic Flowgraph: A New Approach to Process Failure Modeling and Diagnosis for Disturbance Analysis Applications

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Abstract
Logic flowgraph methodology (LFM) is intended to provide a more efficient way of constructing failure models for use in a diagnosis oriented disturbance analysis system. The LFM approach represents a considerable development beyond previous methods and also may be useful in reliability and risk analysis applications. Like the digraph method, LFM produces process models in which the fundamental units of nodes and edges are used to represent process variables and causality relations, respectively. In LFM, however, a more extended set of representation rules allows one to achieve a greater level of modeling capability and flexibility.The LFM models hinge on the interconnection of two distinct networks, namely, the “causality network” and the “condition network.” In a formally defined and organized way the condition network represents the conditions whose occurrence can change or modify the course of process causality flow in the causality network.A test case demonstrates the applicability of LFM to situation...

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