On-Line Parameter Estimation Issues for the NASA IFCS F-15 Fault Tolerant Systems
Mario G. Perhinschi, Marco Lando, Luca Massotti, Giampiero Campa Marcello R. Napolitano, Mario Luca Fravolini *Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506/6106, -Department of Aeronautical Engineering, Polytechnic of Torino, 10129 Torino, Italy. +Department of Electronic and Information Engineering, University of Perugia, 06100 Perugia, Italy.
On-line parameter estimation for restructurable flight control systems
Abstract This paper describes the results of a study where an on-line parameter identification (PID) technique is used for determining on-line the mathematical model of an aircraft that has sustained damage to a primary control surface. The mathematical model at post-failure conditions can then be used by a failure accommodation scheme to compute on-line the compensating control signal to command the remaining healthy control surfaces for a safe continuation and/or termination of the flight. Specific criteria for the use of an on-line PID for these critical flight conditions are first discussed. The methodology is illustrated through simulations of a fighter jet at subsonic flight conditions featuring a novel modeling procedure to characterize the post-failure/damage aerodynamic conditions. The simulations have shown the potential of this on-line PID within a fault tolerant flight control system. The results have also highlighted the importance of conducting an ‘ad hoc’ small amplitude and short-duration PID maneuver immediately following a positive failure detection to enhance the reliability of the on-line estimated parameters used in the accommodation scheme.
Evangelical Law Firms and the Translation of Arguments: A study of the Evangelical Movement s Influence through National and International Courts
................................................................................................VII Acknowledgements......................................................................................IX Abbreviations............................................................................................XI Central Legal Terms .................................................................................XII