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Technology Insertion Projects Group Members Present Work at Space Launch System Technical Interchange Meeting
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Technology Insertion Projects Group Members Present Work at Space Launch System Technical Interchange Meeting

Technology Insertion Projects Group members Peter Berg, Chris Neukom, and Ann Patterson-Hine presented work at the Space Launch System (SLS) Mission and Fault Management (FM) Technical Interchange Meeting (TIM) at Marshall Space Flight Center (MSFC) July 19-21, 2016. The Exploration Upper Stage (EUS) and Block 1B system and subsystem architectures were discussed with the FM community, and suggested EUS and Block 1B failure conditions (abort, warning, safing) based on EUS Goal Tree/Success Tree (GTST) analysis were rolled out. The Technology Insertion Project team presented their work on the GTST model development and analysis, and identification of candidate conditions that would be monitored during various phases of flight. A demonstration of the state analysis model for the EUS was also given. Results of the GTST analysis will be documented in SLS-RPT-087-02 in the first quarter of 2017.

BACKGROUND: A Goal Tree/Success Tree is a top-down functional decomposition of system functions, arranged by major system phase and configuration, which defines what functions the system must perform successfully to meet mission and safety objectives. The GTST representation is not merely a functional decomposition, because it inherently integrates goals and functions together. The GTST representation and its corresponding development methodology provide a means to represent, decompose, and elaborate system goals and functions in a rigorous manner that connects directly to design through use of state variables. The state variable-based approach also provides the means to directly connect FM to the design by identifying the range in which state variables must be controlled to achieve goals, and conversely, the failures that exist if system behavior goes out of range. This in turn allows for systems and FM engineers to determine which state variables to monitor, and what action(s) to take should the system fail to achieve that goal. In summary, the GTST representation provides a unified approach to early-phase FM development.

NASA PROGRAM FUNDING: Space Launch System Mission and Fault Management, Human Exploration and Operations Mission Directorate (HEOMD)

TECHNOLGY INSERTION PROJECTS TEAM: Eric Barszcz, Peter Berg, Jeremy Johnson, Chris Neukom, Ann Patterson-Hine, Greg Pisanich, and Peter Robinson

POINT OF CONTACT: Ann Patterson-Hine, ann.patterson-hine@nasa.gov

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