Axis trajectory period
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“When creating an Orbit plot, it is required that the scales/ranges of the two time-domain waveforms be identical; each point on the Orbit plot corresponds to the instantaneous displacement values of the time-domain waveforms from the X and Y sensors at the same moment. ” From the above text, it can be seen that the principle behind drawing the axis trajectory is that the rotation period should be equal to the period required for one full rotation of the axis trajectory. But why is the vortex frequency generally half of the rotation frequency?
The period for the axis trajectory to complete one full rotation should be equal to the rotation period, because the axis trajectory is derived from the time-domain waveform; therefore, the period in the waveform should match the period in the axis trajectory diagram. I’m not quite sure about this, so I hope for some guidance.