Jet engine technical advisor (JETA)

ABSTRACT

The paper describes a generalized knowledge-based tool for diagnosis which is currently being applied to jet engine maintenance. A domain dependent diagnostic tree is created for a particular jet engine by filling in an empty hypothesis frame for each diagnostic node in the tree. The knowledge in the tree is reasoned about using a generalized and explicit reasoning strategy. This strategy can be guided by rules specific to the activation of a particular diagnostic hypothesis in the tree.The user interacts with the system through a window interface which features definitions, glossary information, schematics and explanations of session reasoning, which are all linked to the knowledge contained in the system. A demonstration prototype which runs under the ART (LISP-based) environment on Symbolics 3620 and Sun 3/60 workstations was completed in December 1988. The preliminary prototype diagnoses a subset of the acceleration faults on the General Electric J85-CAN-15 jet engine and is being field tested and evaluated by potential users.

REFERENCES

• Abu-Hakima88a: Abu-Hakima S. RATIONALE: a tool that reasons explicitly for the purpose of explanation. Proceedings of AAAI '88 Workshop on Explanation, (Aug1988).
• Abu-Hakima88b: Abu-Hakima S. RATIONALE: A Tool for Developing Knowledge-Based Systems that Explain by Reasoning Explicitly. Masters thesis, Carleton University, (May 1988).
• Buchanan84: Bruce G. Buchanan , Edward H. Shortliffe, Rule Based Expert Systems: The Mycin Experiments of the Stanford Heuristic Programming Project (The Addison-Wesley series in artificial intelligence), Addison-Wesley Longman Publishing Co., Inc., Boston, MA, 1984
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• Chu88: Wei-Han Chu, Generic expert system shell for diagnostic reasoning, Proceedings of the 1st international conference on Industrial and engineering applications of artificial intelligence and expert systems, p.7-12, June 1988, Tullahoma, Tennessee, United States [doi>10.1145/51909.51910]
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• Hayes83: Hayes P.J. and Reddy D.R. Steps Towards Graceful interaction in Spoken and Written Man- Machine Communication. International Journal of Man- Machine Studies 19, No. 3, 231-284 (Sept. 1983).
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INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.2 ARTIFICIAL INTELLIGENCE
      I.2.1 Applications and Expert Systems
          Subjects: Industrial automation

Additional Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES
      H.1.2 User/Machine Systems
          Subjects: Human factors

  I. Computing Methodologies
  I.2 ARTIFICIAL INTELLIGENCE
      I.2.4 Knowledge Representation Formalisms and Methods
          Subjects: Representations (procedural and rule-based)
  I.3 COMPUTER GRAPHICS
      I.3.6 Methodology and Techniques
          Subjects: Interaction techniques

  J. Computer Applications
  J.2 PHYSICAL SCIENCES AND ENGINEERING
      Subjects: Aerospace

General Terms:
Human Factors, Theory