Adaptive Nonlinear Incremental Flight Control for Systems With Unknown Control Effectiveness

This article exposes that although some sensor-based nonlinear fault-tolerant control frameworks including incremental dynamic inversion can passively resist a wide range of actuator faults and structural damage without requiring an accurate model the system, their stability heavily relies on sufficient condition, which is unfortunately violated if direction unknown. Consequently, it proved in this no matter, perturbation compensation technique (adaptive, disturbance observer, sliding-mode) implemented, none existing methods guarantee closed-loop stability. Therefore, proposes Nussbaum function-based adaptive framework for systems with partially known (control unknown) or even completely unknown effectiveness. Its effectiveness Lyapunov sense also verified via numerical simulations aircraft attitude tracking problem presence sensing errors, parametric uncertainties, damage, faults, as well inversed