Application of Discrete Event Modeling to drive availability of systems and to identify areas for improvement provides program managers and reliability engineers alike a process for mission/product success, and Maintenance Cost Reductions.

This paper discusses a methodology for the application of physical simulation techniques to the risk assessment of liquid propellant rocket engines, with an example of its application to a Liquid Hydrogen, Liquid Oxygen gas generator cycle engine.

Intermediate failure states are added to a simulation-based risk assessment approach for crewed launch vehicle aborts. While minimizing analysis complexity, these common system-level failure states mark the onset of “loss-of- mission” and permit a more faithful representation of the nuances in path and timing between initial failure and final catastrophic, crew-threatening outcome. The updated model’s utility will be demonstrated in the context of using crew risk to guide abort trigger selection.

According to the network function, network transmission time reliability is advanced as a common parameter to describe network congestion. To evaluate this parameter, structure model, route model, service mechanism model and mission model are built, as well as the simulation flow & evaluation method are expressed. Finally, the backbone of CERNET is studied as a case, and the result shows that this modeling and simulation method is effectively.