Adaptive Nonlinear Incremental Flight Control for Systems with Unknown Control Effectiveness

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Abstract

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

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalIEEE Transactions on Aerospace and Electronic Systems
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Adaptive control
  • Adaptive Control
  • Aerospace control
  • Fault-Tolerant Flight Control
  • Incremental Control
  • MIMO communication
  • Numerical stability
  • Perturbation methods
  • Stability criteria
  • Thermal stability
  • Unknown Control Direction

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