Adaptive Compensation for Actuation Sign Faults of Flexible Spacecraft

Discrete-time Design and Stability Analysis for Nonlinear Incremental Fault-tolerant Flight Control

“…Furthermore, indi ( ) is ultimately bounded which verifies Eq. (15). 8), the tracking performance is still acceptable (Fig.…”

“…However, in reality, this constrain can be violated in severe faulty circumstances. For example, the elements of the control effectiveness matrix have the possibility to switch their signs [15]. Regarding the aircraft attitude dynamics, the control effectiveness matrix B( ) is normally diagonally dominant.…”

“…There is a common precondition for the control effectiveness uncertainties in aircraft fault tolerant flight control. It is widely assumed that the control effectiveness degradation satisfies w < | | < 1 [15][16][17]. Here, we consider that the control effectiveness could also be bigger than the nominal value in practice.…”

Adaptive Nonlinear Incremental Flight Control for Systems With Unknown Control Effectiveness

“…However, they assume that the CEM elements are constant in these monitoring functions. A multiple-model adaptive switching control scheme is proposed in [22]. The multiple-model adaptive control with a switching scheme based on normalized estimation errors addresses the challenge of multiple unknown control direction.…”

Active Fault-Tolerant Incremental Sliding-Mode Flight Control Against Control Reversal

“…It uses a control switching algorithm based on a set of adaptive estimators to guarantee the global attitude tracking performance, in which 2 p estimators and 2 q cost functions are required for a p-input, q-output system. This control strategy was also extended for a flexible spacecraft tracking problem in the presence of actuation sign faults and aeroelastic uncertainties in [20]. Recently, one inverse gain switching adaptive control method was proposed in [1] for tolerating control reversal and parametric uncertainties.…”