APC/PIO Detect Method Based on Fourier Transform and Fuzzy Logic

To realize online detection of aircraft pilot coupling(APC) or pilot induced oscillation(PIO),this paper presents a recursive algorithm of Fourier transform with a sliding window,the membership functions for relevant features,and the identifying model based on fuzzy logic.Through calculating and analyzing for the varieties of flight test data,it is shown that this method is valid and feasible for detecting the APC/PIO.Finally,some suggestions were put forward to further research.