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Qualitative models for space system engineeringThe objectives of this project were: (1) to investigate the implications of qualitative modeling techniques for problems arising in the monitoring, diagnosis, and design of Space Station subsystems and procedures; (2) to identify the issues involved in using qualitative models to enhance and automate engineering functions. These issues include representing operational criteria, fault models, alternate ontologies, and modeling continuous signals at a functional level of description; and (3) to develop a prototype collection of qualitative models for fluid and thermal systems commonly found in Space Station subsystems. Potential applications of qualitative modeling to space-systems engineering, including the notion of intelligent computer-aided engineering are summarized. Emphasis is given to determining which systems of the proposed Space Station provide the most leverage for study, given the current state of the art. Progress on using qualitative models, including development of the molecular collection ontology for reasoning about fluids, the interaction of qualitative and quantitative knowledge in analyzing thermodynamic cycles, and an experiment on building a natural language interface to qualitative reasoning is reported. Finally, some recommendations are made for future research.
Document ID
19900014269
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Forbus, Kenneth D. (Illinois Univ. Urbana, IL, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1990
Subject Category
Engineering (General)
Report/Patent Number
NASA-CR-180682
NAS 1.26:180682
Accession Number
90N23585
Funding Number(s)
CONTRACT_GRANT: NAG9-137
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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