Hybrid Diagnostic System: Beacon-based Exception Analysis for Multimissions - Livingstone Integration

This paper describes the initial integration of a hybrid reasoning system utilizing a continuous domain feature-based detector, Beacon-based Exceptions Analysis for Multimissions (BEAM), and a discrete domain model-based reasoner, Livingstone. BEAM was integrated into Livingstone to provide independent source of evidence in addition to those of the Livingstone's standard monitors. The additional evidence provided by BEAM improved the isolation capability of Livingstone as well as the reliability of its diagnosis. The hybrid reasoner was validated on realistic scenarios from the Propulsion IVHM Test Experiment (PITEX). The hybrid reasoner demonstrated that it could resolve a previously unresolved diagnosis related to regulator and sensor failures.