Understanding Sidebands in Vibration Analysis

When a rotating machine develops a fault, the vibration spectrum often changes before the problem is obvious from sound, temperature or overall vibration level. Harmonics can point to repeated mechanical events, while sidebands around a larger peak can show that another frequency is modulating it.

That makes a spectrum useful for more than spotting a single large peak. It gives maintenance teams a way to compare a machine with its own earlier measurements and investigate changes in bearings, gears, alignment or balance.

The right interpretation depends on the machine, its speed and the way the sensor is mounted. Cesu Turni provides the measured peaks and their strengths; the monitoring system and the people who know the machine turn those measurements into a maintenance decision.