Using Bearing Orbit for Phase Difference detection

One of the important applications of #Bearing_Orbit can be to identify the phase difference of the vibration of two points. In the heading image, the shape of the orbit for different phase differences is displayed.

For example, to measure the phase difference of two bearings on both sides of the coupling in a specific direction (vertical or horizontal) to identify #Misalignment, you will not need to directly measure the phase and install the tacho sensor. By installing the accelerometer at two different points, you can identify the phase difference of them from the shape of the orbit using the guide in the orbit figures indicated above. Even in many cases where the dominant frequency is the first harmonic, you will not need to filter at 1X. In the picture below, without the need for a tach sensor, the 180 degree phase difference on both sides of the coupling - electric motor and fan - can be easily identified.

In the next picture you can find in_phase vibration (zero phase difference) of inboard and outboard horizontal fan bearings indicate 1 plane balancing is applicable for balancing of the fan!

Of course, by observing the waveform of two points together, it is possible to understand the phase difference. provided that both channels are measured together by using a minimum two-channel analyzer.