Multidisciplinary Analysis of Fault Management Design for System Autonomy and Resilience

One of NASAs major technology needs is to increase system autonomy and resilience. To accomplish this, an important taskis to connect fault management (FM)to systems engineering (SE) and operations.In highly reliable systems there must be some means to detect and respond to failure of those functions. Identifying and allocating the requirements and functions for these capabilities is the job of SE.There are recent trends to improve SE through the use of models to create model-based SE (MBSE). An approach for performing SE is the Goal-Function Tree representation,an improved variant of the classical functional decomposition which can be used for analysis of the physical system,and provides a physically accurate representation of requirements traceability in functional success space. Despite their close relationship to SE in practice, SHM/FM practices have remained disjoint. Historically, SHM/FM has been designed into the system only after the nominal system is designed, which essentially makes it a band-aid of the problemswithout consideration of how these might have been prevented or mitigated. This lends itself to a largetechnology and knowledge gap that result in significant inefficiencies throughout the life cycle. QSI plans to integrate TEAMSwith GFT to provide a multidisciplinary solution that connects an important SE approach with a tool that provides analytic capabilities for FM design and operations.It intends to integrate FM directly within SE from the beginning of a project, thereby suitable for FMof future spacecraft. This SBIR: (1) performs FM design analysis of a system design modeled in GFT,(2) enables the FM design to be evaluated comprehensively in an operational context by performing FM functions supportingextensive set of component-level physical and functional failure scenarios, (3) supports Trade Studies to evaluate merits of FM architecture; (4) enables System level assessment and visualization of FM qualities modeled in the GFT. Despite close relationship to SE in practice, FM practices have remained disjoint. Historically, FM has been designed into the system only after nominal system is designed, which makes it a band-aid of problems without considering how these might have been prevented or mitigated. This causes large technology and knowledge gap resulting in inefficiencies throughout the life cycle. The proposed approach combines ease, flexibility of GFT, with ability to model and view system-wide interdependencies with TEAMS. This multidisciplinary information-exchange between distributed models across engineering domains facilitates user collaboration from multiple stakeholders’ perspectives, and simplifies model review process for designers, peer reviewers, and program managers. QSI will address following solicitation requirements: Formalize, optimize onboard FM early in design cycle using MBSE Handle faults in all phases of project lifecycle Improve fault coverage Formal requirements specification Test case generation with traceability to single source of truth Testing, verification, and validation The main objective of the Phase II effort is to integrate the analytic capabilities of TEAMS® within the SysML v2 GFT modeling environment through the implementation of TEAMS® <=> SysML v2 Design <=> GFT model interchange capability so that Systems Engineers can analyze the FM capability of the system during design time without using disjointed processes. Project end-goal includes: Comprehensive demo of the developed capabilities Commercialization using the TEAMS® Toolset Transition to NASA space missions The main deliverable of the Phase II period is a set of modeling standards for SysML v2 for representation of FM and GFT modeling concepts and artifacts, as well as a SysML v2 information exchange capability that facilitates performing FM analyses and studies within the GFT/SE SysML v2 modeling environment. Specific milestones are: Definitive conventions and modeling style-guide to enable GFT success-space modeling approach to seamlessly exchange information with FM models and tools such as TEAMS®. 3-way translation utility between GFT, SysML v2 Design and TEAMS® FM models. Capability to populate RAAML-compliant safety and reliability (S&R) analyses from TEAMS® such as FTA and FMECA in SysML v2. Capability to perform design trade studies and evaluate metrics to evaluate FM architecture, leveraging analytic capabilities and outputs from TEAMS®

This FM capability is relevant to future SMD/HEOMD missions, such as Multi-Purpose Crew Vehicle, Human Landing System, Orion Crew Vehicle, and EUS system of 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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