|RPM-based waterfall of an overcritical rotating shaft.
The rpm-based waterfall is a FFT expanded with the rpm-axis of a rotating shaft. The basic requirement for this function is a rotational incremental encoder mounted on the shaft. The TX-System synchronises the incremental signal with the eddy position. The correlation of rotational speed and FFT results in a characteristic three-dimensional plot. The plot may characterise the state of a rotating system depending on loads, oil-pressure, wear and similar aspects. This admits comparisons of the same system at different times under varying conditions. Figure 8 is the rpm based waterfall of a shaft with a resonance frequency
of 6000 rpm. The amplitude peaks along the ascending and descending path of the rotational speed.
Learn more about the analysis module waterfall RPM in the eddylab video RPM.