Morphological filter based noise removal from vibration signals of fighter plane

The paper solves the pretreatment problem of the vibration signal of a certain fighter plane´s engine. The engine´s vibration signal is mainly affected by noise from the plane´s subsystems and power supply instruments on the ground. The basic frequency of the vibration signal is a little smaller than the frequency of the disturbing signal when the engine operates in the throttling state, the maximum state and the accelerating state, so traditional linear filters such as low-pass filters cannot adequately remove the disturbing signal. We introduce the mixed nonlinear morphological filter with a moving average filter to remove the noise. This method is compared with the moving average filter and a median filter. Test results show that the proposed algorithm can remove the noise with less distortion