Robust Gain-Scheduled Fault Tolerant Control For A Transport Aircraft

Abstract

Abstract-This paper presents an application of robust gainscheduled control concepts using a linear parameter-varying (LPV) control synthesis method to design fault tolerant controllers for a civil transport aircraft. To apply the robust LPV control synthesis method, the nonlinear dynamics must be represented by an LPV model, which is developed using the function substitution method over the entire flight envelope. The developed LPV model associated with the aerodynamic coefficient uncertainties represents nonlinear dynamics including those outside the equilibrium manifold. Passive and active fault tolerant controllers (FTC) are designed for the longitudinal dynamics of the Boeing 747-100/200 aircraft in the presence of elevator failure. Both FTC laws are evaluated in the full nonlinear aircraft simulation in the presence of the elevator fault and the results are compared to show "pros" and "cons" of each control law.

Dynamic event-triggered-based anti-disturbance control for uncertain LPV systems

“…Remark 1. Many systems can be modeled as LPV systems, such as the inverted pendulum control system 40 , the aircraft control system 41 , the missile control system 42 , the aircraft control system 43 , and the aircraft engine control system 44 , etc. The disturbance 𝑑 1 (𝑡) considered in system ( 1) is an unmeasurable disturbance, which exists widely in practice.…”

Robustness Analysis of Integrated LPV-FDI Filters and LTI-FTC System for a Transport Aircraft

“…The nonlinear system is converted into a PLPV system using a function substitution method [8,23,24].…”

“…The method has been sucessfully applied to develop an LPV model from a nonlinear system including look-up table aerodynamic coefficients [22] or polynominal fitted aerodynamic coefficients [23]. For nonlinear dynamics described in polynominal form, the function substitution method is automatically coded to provide a PLPV model [24] using the symbolic toolbox in MATLAB. In this paper, a PLPV system is constructed from the combined model of the LPV model of a tranpsort aircraft and its LPV-FDI filters since the scheduling parameters for the aircraft model and its filters are the same.…”

Information fusion estimation–based flight control of a nonlinear jumbo jet under wind disturbance

“…PID control method is generally applied in the AFCS of jumbo jets. () Many types of control methods have been applied in civil aircraft, such as robust gain‐scheduled control‐based fault‐tolerant control (FTC), sliding‐mode‐based FTC,() LQG/loop‐transfer‐recovery–based active control, robust optimal adaptive flight control, adaptive gain‐scheduled flight control, attitude control based on dynamic inversion and multiobjective optimization, adaptive control–based structural damage FTC, disturbance observer–based dynamic surface flight control, backstepping‐based FTC, optimal control–based model following FTC, and dynamic inversion–based landing control, and model predictive control–based attitude angles protection . These methods improve the tracking performance, robustness to parametric uncertainties, and reliability of the AFCS of civil aircraft, as compared with engineering control methods such as PID control.…”