Robust Fixed-Architecture Linear and Nonlinear Control

摘要

Controls research under this program has concentrated on the development of linear and nonlinear robust fixed structure control for aerospace systems. Specifically, a unified robust nonlinear design framework was developed that provides significant extensions of state of the art recursive backstepping nonlinear control methods to include notions of optimality, robustness, disturbance rejection, actuator constraints, and adaptation. Furthermore, a general nonlinear control design framework predicated on a hierarchical switching controller architecture was developed. The proposed framework provides a rigorous alternative to designing gain scheduled feedback controllers that guarantee global closed loop system stability for nonlinear systems. The aforementioned nonlinear control design frameworks were applied to the control of thermoacoustic combustion instabilities and compressor aerodynamic instabilities involving rotating stall and surge in aeroengines.