Vibration signature analysis Pdf

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SIGNATURE ANALYSIS

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• Which frequencies exist and what are the relationships to the fundamental exciting frequencies.

• What are the amplitudes of each peak

• How do the peaks relate to each other

• If there are significant peaks, what are their source

COUPLE UNBALANCE

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• 180 degree out of phase on the same shaft

• 1X RPM always present and normally dominates

• Amplitude varies with square of increasing speed

• Can cause high axial as well as radial amplitudes

• Balancing requires Correction in two planes at 180 degree 

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