With regard to vibration spectra of rotating machines, normalization is the process of dividing the frequency values along the x-axis by the turning speed of the machine. After this is done, the machine speed will appear at a frequency of 1, the second harmonic will be at a frequency of 2, etc. A glance at the spectrum is all that is needed to find the harmonics of turning speed, and any other components are thus easily seen, especially non-synchronous components.
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