Bearing acoustic vibration monitoring by means of ultrasonic signals
Detection, early if possible, of bearing failure remains crucial for rotating machinery. Listening and measurement with the SDT270 can very easily distinguish a healthy bearing from a damaged one, from the onset of the fault regardless of background noise. Bearing status trend monitoring is ensured by data management in the Ultranalysis software: ultrasonic, vibration, rotation and temperature measurements as well as alarms. A simple and effective solution that is accessible to all.
Defects on rotating machine produce a broad sound spectrum and they are usually monitored by vibration in low frequency. However some specifics defects produce acoustic waves with a rich content in high frequencies: impacting for bearings and gearboxes, friction or rubbing for lubrication and cavitation for pumps.
Consequently, one of the significant advantages of ultrasound, compared to vibration analysis, is to easily monitor bearing and gearbox degradation which could be masked in low frequency analysis.
Moreover, the use of ultrasonic resonant sensors acts as a mechanical amplifier of high frequencies. In addition, the SDT270 ultrasound detector has an excellent signal-to-noise ratio which allows detection of weak variations from background vibrations.
The result is that ultrasound technology is a very selective method highlighting at an early stage these defects against low frequency problems with also a great effectiveness in low speed equipment monitoring.
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