Rotating machines under operational conditions require additional analysis such as order tracking. Compared to normal FFT the spectrum is based to orders instead of frequency (time). The orders describe the fundamental or a multiple of the actual rotation speed [Hz]. With this method you can separate frequency components which are related to engine speed and that are related to structure.
Dewesoft X software provides a powerful and very easy-to-use order tracking module for fast and efficient results. The data and the RPM information is recorded simultaneously in time domain and re-sampled in the order tracking module. Therefore we can show narrow band FFT, waterfall spectra, and still keep all other convenient functions in time domain.
Order tracking requires two signals, the vibration signal and the RPM information. The measurement is done in time domain, and all the order related channels are calculated out of these time signals.
A fast state of the art re-sampling method produces the results online. Run-ups, coast- down or both are possible online.
Time based data recording enables recalculation even in post processing. Narrow band FFT, CPB spectrum and order tracking information could be shown at the same test run, saving time.