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Federal
An Event-based Approach to Hybrid Systems Diagnosability
National Aeronautics and Space Administration —
Diagnosability is an important issue in the design of diagnostic systems, because it helps identify whether sufficient information is available to distinguish all the... -
Federal
Dynamical Model of Rocket Propellant Loading with Liquid Hydrogen
National Aeronautics and Space Administration —
A dynamical model describing the multi-stage process of rocket propellant loading has been developed. It accounts for both the nominal and faulty regimes of cryogenic... -
Federal
Temperature Stratification in a Cryogenic Fuel Tank
National Aeronautics and Space Administration —
A reduced dynamical model describing temperature stratification effects driven by natural convection in a liquid hydrogen cryogenic fuel tank has been developed. It... -
Federal
Improving Diagnosability of Hybrid Systems through Active Diagnosis
National Aeronautics and Space Administration —
Fault diagnosis is key to ensuring system safety through fault-adaptive control. This task is diffcult in hybrid systems with combined continuous and discrete... -
Federal
Improving Multiple Fault Diagnosability using Possible Conflicts
National Aeronautics and Space Administration —
Multiple fault diagnosis is a difficult problem for dynamic systems. Due to fault masking, compensation, and relative time of fault occurrence, multiple faults can... -
Federal
Model-based Prognostics with Concurrent Damage Progression Processes
National Aeronautics and Space Administration —
Model-based prognostics approaches rely on physics-based models that describe the behavior of systems and their components. These models must account for the several...