Calculation of Engine Instantaneous Speed Based on EEMD and Energy Operator Demodulation

In order to solve the problems that the Hilbert transform method of engine instantaneous speed has end effect and low precision,a new method based on ensemble empirical mode decomposition(EEMD)and energy operator demodulation was proposed.The single component signal containing instantaneous rotation frequency was extracted from the original multi-component signal based with the EEMD method,then the instantaneous rotation frequency was extracted from the single component signal by using energy operator demodulation and finally the instantaneous speed was acquired.Therefore,the end effect of Hilbert transform was eliminated effectively and the calculation precision improved greatly.The application of simulated and measured signals verified the effectiveness and accuracy of the method.