A Method of Extracting Shaft Speed Based on Ridge Tracking and Phase Demodulation

The synchronous acquisition of non-shaft phase reference is a process of synchronous acquisition in the digital domain by using the signal processing method to obtain the shaft speed from the vibration signal without speed. A method of extraction shaft speed based on ridge tracking and phase demodulation is introduced in this paper. The method comprehensively considers the characteristics of time-frequency method and demodulation method, and combines the two methods to extract the shaft speed of the vibration signal. In the process of vibration data processing, firstly, the cost function is used to track the target ridge, then the signal is initially sampled, and then the phase demodulation is used to get the instantaneous velocity from the resampled vibration data. An example is given to verify the effectiveness of the ridge tracking demodulation method and the accuracy of shaft speed extraction.