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An integrated approach to system design, reliability, and diagnosisThe requirement for ultradependability of computer systems in future avionics and space applications necessitates a top-down, integrated systems engineering approach for design, implementation, testing, and operation. The functional analyses of hardware and software systems must be combined by models that are flexible enough to represent their interactions and behavior. The information contained in these models must be accessible throughout all phases of the system life cycle in order to maintain consistency and accuracy in design and operational decisions. One approach being taken by researchers at Ames Research Center is the creation of an object-oriented environment that integrates information about system components required in the reliability evaluation with behavioral information useful for diagnostic algorithms. Procedures have been developed at Ames that perform reliability evaluations during design and failure diagnoses during system operation. These procedures utilize information from a central source, structured as object-oriented fault trees. Fault trees were selected because they are a flexible model widely used in aerospace applications and because they give a concise, structured representation of system behavior. The utility of this integrated environment for aerospace applications in light of our experiences during its development and use is described. The techniques for reliability evaluation and failure diagnosis are discussed, and current extensions of the environment and areas requiring further development are summarized.
Document ID
19910006113
Document Type
Conference Paper
Authors
Patterson-Hine, F. A. (NASA Ames Research Center Moffett Field, CA, United States)
Iverson, David L. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1990
Subject Category
ENGINEERING (GENERAL)
Report/Patent Number
NAS 1.15:102861
NASA-TM-102861
A-90272
Meeting Information
Digital Avionics Systems Conference(Virginia Beach, VA)
Funding Number(s)
PROJECT: RTOP 476-84-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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