An Expert System for Restructurable Control
Abstract
Work in progress on an expert system which restructures and tunes control systems online is presented. The expert system coordinates the different methods for redesigning and implementing the control strategies due to system changes. The research is directed toward aircraft and jet engine applications. The implementation is written in LISP and is currently running on a special purpose LISP machine. A restructurable control system has the ability to redesign itself on-line to compensate for a significant change in the system. Restructurability is important to mission effectiveness because it allows a closed-loop system to continue operating in an acceptable manner even after major changes to the system. Here the closed-loop system consists of a controller and plant. Examples of systems with major changes are aircraft with battle damage or engines with foreign object damage. With an invariant control system designed for the nominal plant, an aircraft that experienced battle damage may now only be able to limp home. In the worst case it would be unstable. With a redesigned control system for the new, altered plant, the plane is more likely to return safely and it may be able to carry out all or part of its mission with only slightly reduced capabilities.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1988
- Accession Number
- ADA201038
Entities
People
- Jonathan Litt
Organizations
- National Aeronautics and Space Administration