Measurement-computing Medallion Rotate rev.2.3 Manuale Utente Pagina 28

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28
Medallion Rotate Manual October 2000
In this Waterfall plot, there are
cursors at 0.5 1, 1.5, and 2 orders. The 0.5
order cursor highlights a turbine rub that
“locks” onto one of the shaft critical
frequencies and then deviates from the 0.5
order cursor.
THEORY
The Medallion Rotate Waterfall
analysis uses the standard Fast Fourier transform to calculate the array of FFT
spectra and then display them in a Waterfall or Color Contour plot
(spectrogram). The spectrum calculation allows for standard parameters such as
blocksize, averaging, windowing, weighting (A, B, and C), frequency domain
integration, and integration/differentiation functions as found on most
spectrum analyzers. Medallion Rotate can display spectra as a function of
either time or RPM.
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