Expert systems for automated maintenance of a Mars oxygen production system

Details Expert systems for automated maintenance of a Mars oxygen production system Expert systems for automated maintenance of a Mars oxygen production system

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jspro..29..425h&link_type=abstract

Journal of Spacecraft and Rockets (ISSN 0022-4650), vol. 29, no. 4, p. 425-431.

Statistics

Methodology

Bond Graphs, Expert Systems, Long Duration Space Flight, Manned Mars Missions, Oxygen Production, Automation, Decision Making, Dynamic Models

Scientific paper

Application of expert system concepts to a breadboard Mars oxygen processor unit have been studied and tested. The research was directed toward developing the methodology required to enable autonomous operation and control of these simple chemical processors at Mars. Failure detection and isolation was the key area of concern, and schemes using forward chaining, backward chaining, knowledge-based expert systems, and rule-based expert systems were examined. Tests and simulations were conducted that investigated self-health checkout, emergency shutdown, and fault detection, in addition to normal control activities. A dynamic system model was developed using the Bond-Graph technique. The dynamic model agreed well with tests involving sudden reductions in throughput. However, nonlinear effects were observed during tests that incorporated step function increases in flow variables. Computer simulations and experiments have demonstrated the feasibility of expert systems utilizing rule-based diagnosis and decision-making algorithms.

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