Adaptive Flight Control: A Pragmatic View

An Interim Report of Research on Stochastic and Adaptive Systems

“…Moreover, all available algorithms can exhibit transient undesirable behavior which makes them dangerous to use in practical applications, e.g. control of aircraft [15]. For the most part, the difficulty in applying theoretical results to real problems, with reasonable margins of confidence, can be attributed to the fact that the hypotheses needed to rigorously prove the theory are too restrictive from a practical point of view.…”

Stabilization of uncertain linear systems: an LFT approach

“…Structure of Parameterized Closed-Loop Systems: The central controller for the controller parameterization (with Q = 0) is an observer-based controller, and the observer 0 is given by (42) where 2 is the estimate of the state z of the original system. Therefore, a parameterized controller has some separation structure, and the closed-loop system is structured by the diagram, found in Fig.…”

“…In the multidimensional system case, the block structure represents transform variables, and the resulting controller then provides dynamic feedback [16], [ZO]; for an uncertain linear system with structured parameteric or dynamical perturbations, which can be viewed as a linear parameter varying or linear dynamic varying system [39], [41], [37], [SI, [2], the resulting controllers, which are dynamical and depend on the perturbations, therefore may be thought of as gain scheduled or dynamically scheduled 1421, [3 11; the application implications of such control schemes are obvious when the uncertainties can be measured or identified on-line [42], [37].…”

Historical Overview of Research in Reconfigurable Flight Control

“…It also had primarily focused on disturbance attenuation and eliminating the need for gain scheduling over the flight envelope as opposed to dealing with damage or failure cases. More complex digital adaptive flight control laws were flight tested in the 1970s [3], but the results were mixed and there was still a great deal of scepticism about adaptive control's suitability and value for aircraft [5].…”