An Approach to Oscillatory Failure Case Detection in the Aerospace Industrial Benchmark

Abstract

This paper proposes an approach to detect the oscillatory failure case (OFC) and reconfigure the flight control law after the OFC detection in the Aerospace Industrial Benchmark. To cope with system nonlinearity, a square root unscented Kalman filter is utilized to generate the residual signal. An estimation of the parameter uncertainty based on the fault-free data is incorporated to reduce the influence of model uncertainty on the residual signal significantly. To evaluate the residual signal, a modified integral absolute error based index is introduced along side a check of the oscillation regularity. Our approach is capable of detecting OFCs with very low amplitudes within at most 3 oscillation periods without producing any false alarm, regardless of load factor command, turbulence level or OFC location, type and frequency. The minimum detectable OFC amplitude is 0.6 mm and 0.9 mA for liquid OFCs located at sensor signal and current input signal, respectively, and 0 mm and 0.9 mA for solid OFCs.