Every machine type, whether it is a motor, fan, pump, gearbox, compressor, etc., is made up of a unique assembly of individual components, each required to perform a very specific task or operation. Each of these components generates its own specific vibration signature or characteristics during operation. Very often, the vibration characteristics generated by these components transfer well to locations around the machine where accurate vibration measurements can be made. The vibration signatures measured at these locations not only provide information relating directly to the operating and physical condition of the individual components, but also to the overall condition of the system.

The vibration data measured at any location can be analyzed in its raw form through time waveform vibration analysis. The time waveform can be transformed into an FFT spectrum, or it can be trended as overall, or frequency banded values. An additional technique that is being utilized extensively today is the High Frequency Enveloping (HFE) technique. It is very effective in identifying early stage bearing faults, installation, and lubrication problems (and likewise can be used to track these problems all the way to potential failure).

Unlike some condition monitoring techniques, the vibration monitoring technique is quantifiable allowing accurate trending of changing or deteriorating machine condition. The technique not only enables the vibration analyst to identify the source of the vibration (forcing frequency), but also its severity, thus allowing the maintenance personnel to undertake timely, corrective, or remedial action, prior to severe or catastrophic failure.

Typical machinery, or component problems that are readily identified through vibration analysis include:

Shaft or rotor unbalance; Pump Vibration; Rotor eccentricity; Bent shaft; Shaft or coupling Misalignment; Mechanical looseness; Rolling element bearing faults; Rotor rubs; Journal/Sleeve bearing wear and instability; Resonance problems; Flow related vibrations in centrifugal pumps, fans, blowers and compressors; Gearbox problems such as gear tooth wear, cracked or broken gear teeth and gear misalignment; AC Induction motor problems such as stator and rotor eccentricity, and cracked or broken rotor bars; DC motor control problems; Belt drive problems; Soft or sprung foot; Beat vibration.

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Contact Details

Name: STI Vibrating Monitoring Inc.

Address: 1010 East Main Street League City, Texas 77573

Phone: 281.334.0766

Fax: 281.334.4255

Email: [email protected]

Website: www.stiweb.com