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We report progress in the development of a model-based hybrid probabilisticapproach to an on-board IVHM for solid rocket boosters (SRBs) that canaccommodate the abrupt changes of the model parameters in various nonlineardynamical off-nominal regimes. The work is related to the ORION missionprogram. Specifically, a case breach fault for SRBs is considered that takesinto account burning a hole through the rocket case, as well as ablation of thenozzle throat under the action of hot gas flow. A high-fidelity model (HFM) ofthe fault is developed in FLUENT in cylindrical symmetry. The results of theFLUENT simulations are shown to be in good agreement with quasi-stationaryapproximation and analytical solution of a system of one-dimensional partialdifferential equations (PDEs) for the gas flow in the combustion chamber and inthe hole through the rocket case.

Model based IVHM system for the solid rocket booster