TEAMS Fault Management Extension for State-based Design and Simulation

Reliable testing and VV 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. FM is challenging to design, implement, and verify in the presence of numerous failure scenarios cutting across various subsystems and disciplines. In turn, the hardware, software, and operational mechanisms are equally diverse, and the processes to design, implement, and verify them need to integrate and operate diverse subsystems. Powerful MBSE tools for FM design, implementation, and verification include State Analysis Model (SAM) to discover algorithm, procedure, sequencing, and other errors, prior to testing and to assess potential design changes. The SAM models are effective in capturing state transitions during nominal and off-nominal states and determine if mitigating actions are effective given the transition to an off-nominal state. However, exploring very large set of potential state transitions driven by different component failure modes and their impacts can be challenging, and manual creation of such models with more complete coverage can be arduous for large interconnected systems such as the SLS or the Gateway. QSI plans to integrate TEAMS analytic capabilities with design and simulation software such as NASAs SAM to provide live detection, evaluation, diagnosis and recovery from failures. The team proposes a TEAMS software interface for the SAM modeling environment, that (1) performs FM analysis of a system design modeled in SAM, (2) enables the FM design to be evaluated in an operational context by performing SHM functions during simulations that can support an extensive set of component-level physical and functional failure scenarios, (3) supports trade studies to evaluate merits of FM Fault Protection schemes; (4) enables System level assessment and visualization of FM qualities implicit in the SAM State Machines. Reliable testing and V&V of FM during design, implementation and operations is an essential for development of critical space programs such as SLS, Gateway and Artemis. FM can be challenging to perform solely by MBSE tools such as SAM when numerous failure scenarios can lead to large state transitions by component failure modes & their impacts, and manual creation of such models can be arduous. The proposed approach combines ease, dynamism of SAM, with ability to model and view system-wide interdependencies with TEAMS. This multidisciplinary information-exchange facilitates collaboration from multiple stakeholders. QSI will address following solicitation requirements: Formalize, optimize onboard FM early in design cycle using MBSE FM operations approaches, FM “in-the-loop”, state estimation/classification, model-based reasoning Increase data integrity between multidisciplinary tools Decrease labor & time to develop & test FM models & algorithms Improve visualization of full FM design across HW/SW & operations Enable cost-effective FM design architectures & operations V&V technologies The main objective of the Phase II effort is to integrate the analytic capabilities of TEAMS® within the SAM modeling environment through the implementation of SysML v2 Design <-> TEAMS® <-> SAM model interchange capability so that Systems Engineers can analyze the FM and SHM capability of the system during design time without having to use separate processes. Project end-goal includes: Comprehensive demo of the developed capabilities Commercialization using the TEAMS® Toolset Transition to NASA space missions The main deliverable is a set of modeling standards for TEAMS® for representation of FM and SAM modeling concepts and artifacts, as well as a SysML v2 information exchange capability that facilitates performing FM analyses and studies within the SAM/SE modeling environment. Specific milestones are: SAM model of the SHARC and other identified NASA systems Simulink (or equivalent) connectors that provides Critical fault list, FM design and Fault Protection analyses, system SHM in simulation tools such as SAM. Integration with SHARC hardware testbed at NASA MSFC. Capability to perform design trade studies in simulation environments and evaluate metrics to evaluate FM architecture, and trace Response/Recovery paths and deadly embraces leveraging TEAMS® analytic capabilities and outputs.

This FM capability is relevant to future SMD/HEOMD missions, such as Multi-Purpose Crew Vehicle, Human Landing System, Orion Crew Vehicle, and ECLSS system, SLS. Artemis Mission – Lunar Lander, cis-lunar infrastructure including Gateway and deep space human exploration such as Habitat, and Moon to Mars mission are prime targets. Other targets include Deep Space missions such as Europa Orbiter, InSight lander mission, and Mars Science Laboratory. Earth orbiters such as Landsat-9 are also targets. Arcus X-ray telescope is another target platform. Commercial space launch vehicles (e.g., SpaceX), Geosynchronous earth orbit (GEO), Medium earth orbit (MEO), Low earth orbit (LEO), Space Command ground segments, DoD, USAF, US Navy, commercial aviation, military systems e.g., NORAD, JSF, Navy shipboard platforms, Submarine Commands, BMD systems, UAVs, UMGs, model-based design of space missions/satellites, supporting infrastructure Space services.

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