Vibration fault diagnosis – axis trajectory diagram
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How is the axis trajectory diagram formed? Why is it necessary to determine whether there is forward precession or reverse precession, and how is that determined?
The axis trajectory is formed by the superposition of the time-domain waveforms of the XY probe. Precession in the same direction as the rotor’s rotation is called positive precession
What was said upstairs is correct; to add something: precession in a direction opposite to the rotation direction of the rotor is called reverse precession, which indicates that there is friction between the moving and stationary components.