Stable adaptive fault-tolerant control of overactuated aircraft using multiple models, switching and tuning

Abstract

In this paper we considered the existing stable adaptive fault-tolerant control system design from references [3,4] for achieving acceptable flight performance in the presence of control effector failures. This controller is developed for the overactuated case, i.e. the case when the number of control effectors exceeds the number of controlled outputs. We have shown that, in some cases, single or multiple effector failures introduce disturbances that are too large to be effectively handled by a single adaptive controller. To address this problem, in this paper we developed an adaptive fault-tolerant flight control system based on the concept of multiple models, switching and tuning from reference [11]. We have shown that such a controller yields a stable overall system, is sufficiently robust in the presence of severe control effector failures, and achieves excellent overall performance as illustrated through simulations of F/A-18A carrier landing maneuver.

An adaptive nonlinear output feedback controller using dynamic bounding with an aircraft control application

“…It follows from Assumption (A3) that the polynomial k 1,m b s m b +k 1,m b −1 s m b −1 +···+k 1,1 s +k 1,0 is stable, and, in addition, from (6), that k 1,m b >0.…”

“…610 X. TANG AND G. TAO Compensation for actuator failures that are often unknown in terms of failure patterns, failure times and failure values is an important area in control with many open issues. Recently, there have been many results in the literature on control of systems with actuator failures under several different directions such as multiple models, switching and tuning designs [5,6], fault detection and diagnosis-based designs [7,8] and adaptive designs [9][10][11]. Since adaptive designs use one adaptive controller to accommodate both the uncertainties caused by actuator failures and the uncertainties from the system parameters and dynamics without any explicit fault detection technique, adaptive compensation control has a simple structure.…”

Direct Adaptive Control of Systems with Actuator Failures: State of the Art and Continuing Challenges

“…where A (2) and B (2) are zero matrices, A (1) , A (4) , B (1) and B (4) are standard as in the literature, and A (3) and B (3) represent the effect of engine thrust differentials (if the left and right engine thrusts are equal, A…”

“…One approach to adaptive control consists of multiple model, switching and tuning schemes [1][2][3] . Another class of adaptive control designs is based on direct adaptive control approach ( 4-6 and the authors' work [7][8][9][10][11] ) for unknown systems with unknown actuator failures characterized by inputs stuck at some fixed or varying values not influenced by control action.…”

Robust adaptive output‐feedback control for a class of nonlinear systems with time‐varying actuator faults

“…Generally speaking, the FTC methods can be classified into two types [1,3]: passive or active approaches (see, e.g. [4][5][6] and [7][8][9][10][11][12][13][14][15][16][17][18][19], respectively).…”