Airborne & structure-borne ultrasound is high frequency sound that is above the range of normal human hearing.  These high frequency sounds travel through the air, or via a solid.  The ultrasound instrument senses and listens for the high frequency sound, and then translates the high frequency sound into an audible sound that is heard via the headset by the inspector.  The unit of measurement for sound is a decibel (dB) level, which is indicated on the display of the ultrasonic instrument.

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When a bearing is in a lack of lubrication state, there is an increase in both friction and noise.  When using the ultrasonic instrument, the inspector listens to the bearing and watches the decibel level on the instrument.  As grease is applied, there is less friction and less noise.  Once a proper lubrication level is reached, the dB level will remain steady and constant.  If grease continues to be applied, the dB level will gradually start to increase.  At this point, lubrication would need to cease because the threshold for over lubrication has been reached.  An over lubrication condition also increases both pressure and friction inside the housing, thus creating more noise.

Low-friction bearings should be used in housing subjected to high revolutions. Among such bearings are single-row ball bearings for purely radial loads. Angular ...

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Typical applications for ultrasound include compressed air & gas leak detection, electrical inspection of energized electrical equipment to detect corona, tracking, and arcing, steam traps, and mechanical inspection of rotating equipment including condition based lubrication with ultrasound.

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There are various sources of ultrasound.  In regards to compressed gas leak detection, turbulence is created when the high pressure leaks to the lower pressure atmosphere.  The source of ultrasound with bearing lubrication is friction.  When there is an increase in friction, there is an increase in the decibel level or more noise.

Using an ultrasound instrument to listen to the bearing while applying lubricant and watching the decibel level, one can determine when enough grease has been applied and when the threshold where over lubrication has begun.

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If the majority of bearing failures are lubrication related, implementing an ultrasound instrument to use when lubricating bearings has the potential to greatly decrease the amount of bearing and equipment failures that can be traced back to improper lubrication procedures.

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