Measurement-computing Medallion Rotate rev.2.3 Manual do Utilizador descarregar pdf (Página 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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Measurement-computing Medallion Rotate rev.2.3 Manual do Utilizador Página 28