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ISHM Technology Insertion Project Group Members Staff Space Launch System Engineering Support Team Launch Role
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ISHM Technology Insertion Project Group Members Staff Space Launch System Engineering Support Team Launch Role

To support Space Launch System (SLS) Day of Launch (DOL) activities, Marshall Space Flight Center’s (MSFC) Vehicle Management (VM) Mission and Fault Management (M&FM) team has been allocated nine seats on the SLS Engineering Support Team. Integrated Systems Health Management (ISHM) Technology Insertion Projects group members Jeremy Johnson and Chris Risner are staffing the M&FM Engine seat for DOL in February of 2022, and the two remaining scheduled cross-program simulations on November 15th and December 13th of this year (having worked the seat for all past sims as well). M&FM develops the algorithms that monitor the SLS vehicle, and thus M&FM’s role during DOL is to confirm that the algorithms work as intended and convey to the Launch Control and Flight Control Teams the implications of any failures that are detected. The M&FM Engine seat is responsible for the algorithms monitoring SLS’s four RS-25 engines.

As part of the State Analysis Model (SAM) development team, Jeremy and Chris will also have the SAM standing by during DOL to simulate any scenarios of interest. For example, if a Launch Commit Criteria is violated during countdown but the violation is accepted and the count allowed to continue, the SAM can be run to make sure that the scenario will not result in an automatic launch halt once the flight software takes control of the vehicle. The SAM was also used to help prototype and test the main M&FM display by emulating it and running data through it during M&FM-only sims months before the program started streaming data to help develop displays. This main M&FM display is now widely used by many non-M&FM groups in MSFC’s SLS Engineering Support Center.

BACKGROUND: The Space Launch System Day of Launch team consists of several groups, including Kennedy Space Center (KSC) launch console experts on the Launch Control Team, Johnson Space Center (JSC) flight console experts on the Flight Control Team, and SLS subsystem experts on the SLS Engineering Support Team. The Launch Control and Flight Control Teams execute the launch and ascent of the vehicle and consult with the Engineering Support Team as needed. There have been several sims exercising the integration of these teams during various parts of DOL, including during cryo loading, terminal countdown, SLS ascent, and Interim Cryogenic Propulsion Stage (ICPS) flight.

The State Analysis Model makes use of MATLAB’s Simulink and Stateflow toolboxes to represent the SLS vehicle as state machines and the SLS flight software as executable flow diagrams. This model allows for rapid, accurate execution of thousands of scenarios that would otherwise be slower and more costly to run in traditional hardware and/or software test environments.

NASA PROGRAM FUNDING: Space Launch System Mission & Fault Management

TEAM: Jeremy Johnson and Chris Risner

POINT OF CONTACT: Chris Risner, c.d.risner@nasa.gov

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