Full Spectrum
- Updated2024-06-07
- 1 minute(s) read
Full Spectrum
Full spectrum is the spectrum of an orbit. The amplitude of the full spectrum indicates the vibration level at each frequency/order.
The relative amplitude between the forward and reverse components
indicates the orbit eccentricity and the direction of
precession. Forward precession is precession in the same
direction as the direction of rotation while reverse precession
is precession in the opposite direction as the direction of
rotation. The figure below shows typical filtered orbits on the
left and the associated full spectra on the right. The direction
of rotation for this simulated data is counter clockwise.
Note The
red dots in the orbit plots mark the beginning of a
revolution.
While absolute probe orientation is required to accurately compute orbit plots, the full spectrum depends only on the measured vibration and the relative angle between the paired sensor measurements.