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An experimental study of fault propagation in a jet-engine controllerAn experimental analysis of the impact of transient faults on a microprocessor-based jet engine controller, used in the Boeing 747 and 757 aircrafts is described. A hierarchical simulation environment which allows the injection of transients during run-time and the tracing of their impact is described. Verification of the accuracy of this approach is also provided. A determination of the probability that a transient results in latch, pin or functional errors is made. Given a transient fault, there is approximately an 80 percent chance that there is no impact on the chip. An empirical model to depict the process of error exploration and degeneration in the target system is derived. The model shows that, if no latch errors occur within eight clock cycles, no significant damage is likely to happen. Thus, the overall impact of a transient is well contained. A state transition model is also derived from the measured data, to describe the error propagation characteristics within the chip, and to quantify the impact of transients on the external environment. The model is used to identify and isolate the critical fault propagation paths, the module most sensitive to fault propagation and the module with the highest potential of causing external pin errors.
Document ID
19900014085
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Choi, Gwan Seung (Illinois Univ. Urbana-Champaign, IL, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1990
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
CSG-124
NASA-CR-181335
UILU-ENG-90-2216
NAS 1.26:181335
Accession Number
90N23401
Funding Number(s)
CONTRACT_GRANT: NAG1-602
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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