Conditional Trouble Graph for Describing Fault Relation of a Complex System

In order to exactly and effectively describe the relation between system condition and fault relation in analyzing fault relation of a complex system, a descriptive model of conditional trouble graph is presented. The state-tree of the system condition is combined with trouble graph to form a conditional trouble graph. The structure of the graph and the changing characteristics of the conditions are defined and analyzed, a characteristic example which was applied in the control system of an aeroengine is given. The graph can effectively describe the influence and effect of the condition on the fault relation, and is applicable to automatic description and analysis of fault relation.