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Advanced Caution and Warning System Reasoner Advanced to Meet Orion Exploration Flight Test-1 Goals
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Advanced Caution and Warning System Reasoner Advanced to Meet Orion Exploration Flight Test-1 Goals

The Integrated Systems Health Management (ISHM) Technology Insertion Projects Group extended the Advanced Caution & Warning System (ACAWS) reasoner to determine loss of redundancy to vehicle (sub)systems/components for concurrent multiple faults. With previously completed reasoner extensions to determine loss-of-function effects, ACAWS can now support the Exploration Flight Test-1 (EFT-1) controllers’ goal to prepare for the “next worst failure.” This completes the Space Technology Mission Directorate (STMD) Game Changing Development (GCD) Autonomous Systems project milestone to deliver an improved version of ACAWS to the Advanced Exploration Systems (AES) Autonomous Mission Operations (AMO) project. We are now developing a caching approach to improve performance with the complex EFT-1 diagnostic model for specific failure modes with extensive propagation paths.

BACKGROUND: The goal of the ACAWS task is to develop essential technology that enables deep-space mission crews to more effectively handle off-nominal conditions. On deep-space missions, round-trip communication time delay makes it impossible to close the loop with Mission Control on Earth prior to taking critical actions. Even a small number of round-trip communications necessary for Earth-based mission control to provide guidance can exceed failure time to criticality. The ACAWS integrated suite of intelligent system technologies can provide crew support to identify problems, decide when to take action, and what actions to take. Determining what parts of the system are affected by failures – either becoming disabled or losing a level of redundancy – is a critical precursor to correcting a problem. ACAWS leverages the efforts of creating a diagnostic model of a system to reason about the propagation of failures through the system. The core ACAWS software combined with a vehicle-specific model of (a subset of) the EFT-1 vehicle will be demonstrated in shadow mode during the Orion EFT-1 mission, scheduled for December 2014.

EFFECTS REASONER TEAM: Gordon Aaseng, Eric Barszcz, Vijay Baskaran, Silvano Colombano, Jeremy Johnson, and Lilly Spirkovska ACAWS TEAM: Minh Do, Mike FitzPatrick (JSC), David Iverson, Terry Keeler (JSC), Rob McCann, Richard Morency (JSC), Paul Morris, Haifa Moses (JSC), John Ossenfort, Nancy Rustemeyer (JSC), Ernie Smith, Irene Smith, Adam Sweet, and Henry Valdez (JSC)

NASA PROGRAM FUNDING: Autonomous Systems (AS) project (for core ACAWS software), and the Advanced Exploration Systems (AES) Autonomous Mission Operations (AMO) project (for vehicle-specific application), Game Changing Development (GCD) program, Space Technology Mission Directorate (STMD)

Contact: Lilly Spirkovska

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