A gain-varying UIO approach with adaptive threshold for FDI of nonlinear F16 systems

摘要

A discrete gain-varying unknown input observer (UIO) method is presented for actuator fault detection and isolation (FDI) problems in this paper.A novel residual scheme together with a moving horizon threshold is proposed.This design methodology is applied to a nonlinear F16 system with polynomial aerodynamics coefficient expressions,where the coefficient expressions for the F16 system and UIOs may be slightly different.The simulation results illustrate that a satisfactory FDI performance can be achieved even when the F16 system is under the environment of model uncertainties,exogenous noise and measurement errors.