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Vibration Analysis Tip - Phase Analysis

June 14, 2007
(Vibration Analysis)

Phase analysis is a parameter often used for rotor balancing and as a Diagnostic Tool for detecting Alignment, Eccentricity, Bent Shaft, and Looseness faults in rotating machinery.

Additional techniques for phase analysis involve not just one static measurement, but a series of measurements aimed at detecting the change of phase in a vibrating system. The series of measurements is designed to detect the drift in the unbalance vector. Some sources of phase change might include slippage in felt driven paper rolls, slippage in sheaves and pulleys, trapped fluids in hollow rotors, or condensate buildup in paper machine dryer cans, cracked drive shafts, or loose rotor fits. Sometimes phase modulation may not be considered a “problem”, i.e., as in the monitoring of beat frequency induced by two or more rotating sources in close proximity.

As with other tools, extended use of phase analysis can draw the analyst a little closer to the root of the problem, or at least narrow the field of suspected faults.

Tip provided by Dan Ambre, P.E.
Full Spectrum Diagnostics, PLLC
Phone: 763-577-9959


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