TEAMS Fault Management Extension for State-based Design and Simulation

Reliable V&V and testing of fault management (FM) during design, implementation and operations is an essential part of systems engineering design and development of critical space programs such as the SLS, Gateway and Artemis. NASA’s Mission and Fault Management group currently utilizes SAM to assess nominal and FM algorithms prior to full-scale real-time testing, to proactively check potential algorithm changes before finalizing algorithm design and to search for integration issues across multiple subsystems, vehicles, and systems. However, exploring large set of state transitions driven by multiple component failure modes and their impacts is challenging for large interconnected systems such as the Gateway. The key innovation in this proposal is to bridge the gap between state machine modeling which seeks a top-level system view for FM and the more bottom-up physical and functional failure models by connecting state machine modeling tools such as MathWorks® Stateflow and the newest revision 2 of vendor-neutral Systems Modeling Language (SysML v2), to industry-adopted and commercial FM design, analysis, and verification methods, via use of the commercial-off-the-shelf TEAMS® tool. Connecting component failure modes to their failure functions, functional failure propagation and their manifestations in various effects are suitably poised to drive a complex sequence of state transitions as modeled in SAM for various subsystems and subsystems and allows for a significantly improved coverage (e.g., through a rich set of what-if failure scenarios) for the off-nominal behavioral models as captured in SAM by incorporating the functional failure models such as in TEAMS® as their driver. Doing this combines the best qualities of each model and its associated analytical and operational capabilities to take advantages of what each tool and methodology does best. In essence, the State Machine Model and TEAMS® models will provide single sources of truth for modeling and analysis.

This technology is applicable for verification testing of NASA’s next generation launch vehicle such as SLS, cis-lunar infrastructure including Gateway and deep space human exploration such as the Habitat. The Exploration Upper Stage’s for which SAM is partially implemented will also be a target. The Gateway spacecraft has some simulation and vehicle models, which can be integrated into the MBSE environment and evaluated against FM robustness. Europa is also strong candidate for demonstrating the FM capabilities within SAM driven MBSE practices

The technology can be applied to DoD’s Mission planning and Rapid design of space missions / satellites including Geosynchronous earth orbit (GEO), Medium earth orbit (MEO), and Low earth orbit (LEO), commercial space launch vehicles (e.g., SpaceX), NORAD, Space Command ground segments, JSF, Navy shipboard platforms, submarines, BMD systems, UAVs, UGVs and unmanned submersible vehicle markets.

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