Method for measuring corresponding phase positions of vibration signals of different measuring points of rotary machine

The invention discloses a method for measuring corresponding phase positions of vibration signals of different measuring points of a rotary machine. A vibration signal detected by a first vibration sensor is used as a reference wave shape after being processed, the reference wave shape is input into a measuring device to be made into a pulse-width modulation signal, the pulse-width modulation signal is used as the clock frequency of a narrow-band tracking wave filtering module, a second vibration sensor respectively detects vibration signals of a first measuring point and a second measuring point of the rotary machine, the vibration signals of the first measuring point and the second measuring point are input into the narrow-band tracking wave filtering module after being processed and input into the measuring device as a vibration wave shape after the A/D conversion, the measuring device respectively calculates the phase position difference of the reference wave shape and the vibration wave shapes of the fir