Accession Number : ADA332660

Title :   Modeling and Control of Uncertain Systems with Applications to Air Force Problems

Descriptive Note : Final rept. 1 Sep 94-31 Aug 97

Corporate Author : LOUISIANA STATE UNIV BATON ROUGE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Gu, Guoxiang

PDF Url : ADA332660

Report Date : AUG 1997

Pagination or Media Count : 26

Abstract : This primary goal of this research program is investiation of novel approaches to robust-control-orientied system identification techniques and robust feedback control system design methods that solve typical Air Force problems. Theis goal has been accomplished successfully focusing on gap-metric, and a v-metic uncertain systems described by normalized coprime factors, and on rotating stall and surge contorl for axial flow compressors as application platform, that we demonstrated in the 9 journal publications, two book chapters and 14 conference papers, including those accepted for publication during the past three years. Several algorithms were-developed to identify the nominal model using frequency domain data with quantification of the unmodeled dynamics in Hx/Lx norm, that are shown to coverge in presence of th worst-case noise contaminated in experimental data. Control of gap-metric, and av-metric uncertain systems was studied in connection with multiplicative/relative perturbations in general coprime factors, and Hx loopshaping design method was generalized to Lx loopshaping that apply to those systems involving uncertainties in normalized coprime factors with bound Lx norm. Moreover an effective algorithm was developed for model reduciton of observer-based controllers. The PI has also strived to enhance the applicaiton part of this research program, and has spent two summers in Wright Laboratory at Wright-Patterson Air Force base, and at Eglin Air Force Base. In close collaborations with the control group in Wright Laboratory of the WPAFB (led by Dr. Siva Banda), application research in our program has focused on compressor control that are essential to the improvement of aeroengines and performance of jet airplanes.

Descriptors :   *ROBOTS, *CONTROL THEORY, ALGORITHMS, EXPERIMENTAL DATA, DYNAMICS, STALLING, PLATFORMS, PERTURBATIONS, AIR FORCE FACILITIES, NOISE, COMPRESSORS, ROTATION, FREQUENCY DOMAIN, MULTIPLICATION FACTOR, JET AIRCRAFT, AXIAL FLOW COMPRESSORS.

Subject Categories : Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE