Abstract
Sensors play important roles in aircraft electronic system, their faults will bring huge risks to the system safety and reliability. Considering the harsh service environment of the aircraft, a unified sensor fault detection and diagnosis scheme is proposed for the aircraft subject to strong Gaussian noise, strong non-Gaussian noise, and unknown disturbance, which is based on a fractional-order chaos system. To make the fractional-order chaos system can be used for fault detection and fault diagnosis, the structure, system parameters, and fractional-order of the system are adjusted according to the stability of the fractional-order system. The novel dynamics of the adjusted fractional-order nonlinear system are analyzed with multiple methods. Based on that, a residual evaluation method and a threshold computation method for fault detection and diagnosis are designed and formulated. A set of experiments and comparison experiments are made for verifying the effectiveness of the proposed unified fault detection and fault diagnosis scheme.
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