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Los Angeles (LA) Association for Computing Machinery (ACM)
Technical Activity Committee on Artificial Intelligence (TACART)

             TACART

TOPIC:       Model Based Fault Management
             From Laboratory To Space

SPEAKER:     Dr. Ksenia Kolcio, TRW

DATE:        18 March 1998 (Wednesday night)

TIME:        The talk will begin at 7:30.

PLACE:       Loyola Marymount University, Pereira Hall 14.
             LMU is located at Loyola Blvd. and 80th Street in
             Westchester. From the 405, take the Manchester exit
             and proceed west to Loyola Blvd.  Turn north, and
             continue until you enter the LMU campus.  Ask the
             guard for directions to Pereira Hall. Parking is free.

ABSTRACT:    One of the primary capabilities needed to accomplish
             autonomous air/space flight missions is that of self
             diagnosis in the event of a hardware failure. A 
             diagnostic engine called Marple, developed at TRW,
             is a model based reasoner capable of detecting and
             isolating hardware failures via a technique called
             constraint suspension. Nominal model building and
             verification and validation (V&V) play a critical
             role in Marple's ability to perform successfully.
             It is desired to detect a fault before critical
             limits are exceeded and then correctly isolate the
             fault down to the lowest replaceable unit. Moreover,
             the occurrence of costly false positives must be
             minimized and, to be of practical use, eliminated.
             This talk details our experiences and lessons
             learned in applying real data to the Marple model
             V&V process. A general modeling and V&V approach
             is formulated that advocates the use of first 
             principles whenever possible and on and off-line
             parameter estimation for tuning. Models of certain
             basic components common to many spacecraft are
             reusable. A basic model can be tuned to a specific
             spacecraft via parameter estimation. Initial models
             developed from first principles can be "sanity
             checked" with simulations encompassing ideal and
             disturbance cases.

BIOGRAPHY:   Ksenia Kolcio is an engineer in the Avionics Systems
             Center at TRW. Currently she is working in the
             Spacecraft Autonomy and On-board Processing
             Initiative research group. She received her Ph.D.
             from the University of Cincinnati in Electrical
             Engineering. Her research interests include condition
             monitoring oriented modeling and fault management
             system architecture.

DINNER:      No dinner is planned.  No social activities are planned.
NEWSGROUPS:  Announced in comp.ai, la.seminars, ca.seminars.
HOMEPAGE:    http://server.eng.lmu.edu/tacart/
CONTACTS:    L. Andrew Campbell campbell@aero.org (310) 336-8642 or
             Program Chair Barney Toma tomab@ecn.com (310) 323-8451.
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| L. Andrew Campbell     internet: campbell@aero.org       |
| M1-102 PO Box 92957    organization: The Aerospace Corp. |
| Los Angeles CA 90009   telephone: (310) 336-8642         |