A functional failure reasoning methodology for evaluation of conceptual system architectures |
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Authors: | Tolga Kurtoglu Irem Y Tumer David C Jensen |
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Affiliation: | (1) Mission Critical Technologies, Intelligent Systems Division, NASA Ames Research Center, Moffett Field, CA, USA;(2) Complex Engineering Systems Design Lab, Oregon State University, Corvallis, OR, USA |
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Abstract: | In this paper, we introduce a new methodology for reasoning about the functional failures during early design of complex systems.
The proposed approach is based on the notion that a failure happens when a functional element in the system does not perform
its intended task. Accordingly, a functional criticality is defined depending on the role of functionality in accomplishing
designed tasks. A simulation-based failure analysis tool is then used to analyze functional failures and reason about their
impact on overall system functionality. The analysis results are then integrated into an early stage system architecture analysis
framework that analyzes the impact of functional failures and their propagation to guide system-level architectural design
decisions. With this method, a multitude of failure scenarios can be quickly analyzed to determine the effects of architectural
design decisions on overall system functionality. Using this framework, design teams can systematically explore risks and
vulnerabilities during the early (functional design) stage of system development prior to the selection of specific components.
Application of the presented method to the design of a representative aerospace electrical power system (EPS) testbed demonstrates
these capabilities. |
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