FUZZY SCHEDULING OF REGIONAL QFT CONTROLLERS

✍ Scribed by T. J. Kobylarz; M. Pachter; C. H. Houpis

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 789 KB
• Volume: 7
• Category: Article
• ISSN: 1049-8923
• DOI: 10.1002/(sici)1099-1239(199706)7:6<661::aid-rnc296>3.0.co;2-d

✦ Synopsis

A novel optimization-based controller synthesis method is developed for nonlinear dynamic systems with structured parametric uncertainty. Fuzzy logic is used to smoothly schedule independently designed regional robust controllers over the plant's operational envelope. These linear controllers are synthesized using established conventional control design techniques, e.g., quantitative feedback theory. The resulting full envelope nonlinear dynamic controller handles complex dynamic systems which cannot otherwise be addressed by simple fuzzy logic control (FLC). An analytical representation of the membership functions of FLC allows the optimization to chose the location parameters of the regional controllers. The scheduled controller's valid region of operation is maximized, thus efficiently achieving full envelope operation, while guaranteeing pre-specified tracking performance.