Reconfigurable flight control

Abstract Indirect adaptive control for reconfigurable flight control is advocated. Specifically, online static system identification using a moving window/batch estimation is implemented. The ensuing linear regression is augmented with an intercept. The intercept parameter is included to address the effects of trim change associated with the occurrence of a control surface failure. Parameter estimate information is used to adjust the inner loop's control gains, and a command derived from the intercept estimate is fed forward to automatically retrim the aircraft. The tracking performance of this automatic retrimming method, which relies on system identification, surpasses the conventional approach of exclusively relying on integral action for retrimming. These adaptive and reconfigurable flight control concepts are illustrated in the context of a fighter aircraft's pitch plane dynamics. The novel adaptive and reconfigurable flight control system successfully handles a 50 per cent horizontal tail control surface loss.

[1]  Meir Pachter,et al.  Reconfigurable tracking control with saturation , 1995 .

[2]  Meir Pachter,et al.  Regression techniques for aircraft parameter identification from noisy measurements in maneuvering flight , 1992, [1992] Proceedings of the 31st IEEE Conference on Decision and Control.

[3]  Kevin A. Wise,et al.  Flight testing of a reconfigurable flight control law on the X-36 tailless fighter aircraft , 2000 .

[4]  Wright-Patterson Afb,et al.  Integration of On-line System Identification and Optimization-based Control Allocation* , 1998 .

[5]  Inchi Hu,et al.  On consistency of Bayes estimates in a certainty equivalence adaptive system , 1998, IEEE Trans. Autom. Control..

[6]  Meir Pachter,et al.  System identification for adaptive and reconfigurable control , 1995 .

[7]  A.K. Caglayan,et al.  Evaluation of a second generation reconfiguration strategy for aircraft flight control systems subjected to actuator failure/surface damage , 1988, Proceedings of the IEEE 1988 National Aerospace and Electronics Conference.

[8]  David G. Ward,et al.  Indirect adaptive flight control of a tailless fighter aircraft , 1999 .

[9]  James Stewart,et al.  Flight demonstration of a self repairing flight control system in a NASA F-15 fighter aircraft , 1990 .

[10]  S. Musick,et al.  Projectile launch point estimation from radar measurements , 2005, Proceedings of the 2005, American Control Conference, 2005..

[11]  M. Pachter,et al.  Ballistic Trajectory Tracking Using Constrained Estimation , 2005, Proceedings of the 2005 IEEE International Symposium on, Mediterrean Conference on Control and Automation Intelligent Control, 2005..

[12]  Alan S. Willsky,et al.  A survey of design methods for failure detection in dynamic systems , 1976, Autom..

[13]  Meir Pachter,et al.  Linear Regression with Intercept , 2004 .