KEYWORDS: Sensors, Hazard analysis, Computer simulations, Safety, Failure analysis, Control systems, Algorithm development, Systems modeling, Data modeling, Avionic systems
Human space travel is inherently dangerous. Hazardous conditions will exist. Real time health monitoring of
critical subsystems is essential for providing a safe abort timeline in the event of a catastrophic subsystem failure. In this
paper, we discuss a practical and cost effective process for developing critical subsystem failure detection, diagnosis and
response (FDDR). We also present the results of a real time health monitoring simulation of a propellant ullage
pressurization subsystem failure. The health monitoring development process identifies hazards, isolates hazard causes,
defines software partitioning requirements and quantifies software algorithm development. The process provides a means
to establish the number and placement of sensors necessary to provide real time health monitoring. We discuss how health
monitoring software tracks subsystem control commands, interprets off-nominal operational sensor data, predicts failure
propagation timelines, corroborate failures predictions and formats failure protocol.
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