Ultrasonic Testing & Analysis
YOUR Bearing failure - is one of he most common causes of motor or pump breakdowns.
Acton EMS has an Ultrasonic Service that detects the first signs of slow moving bearings, air hose, fans and dust.
How to trend bearings with Ultrasound
Mechanical movements produce a wide spectrum of sound. By focusing on a narrow band of high frequencies, beyond human hearing, the Ultraprobe detects subtle changes in amplitude and sound quality.
The Ultraprobe takes the detected ultrasonic frequencies and changes them into audible sounds in the headphones
Based on research by NASA, it was established that ultrasonic monitoring provides early warning of bearing failure. Various stages of bearing failure have been established. An 8-dB gain over baseline indicates pre-failure or lack of lubrication. A 12-dB increase establishes the very beginning of the failure mode. A 16-dB gain indicates advanced failure condition while a 35-50 dB gain warns of catastrophic failure.
There are two basic methods for ultrasonic bearing monitoring: comparative and historical. In order to troubleshoot bearings or to establish a baseline, it is necessary to compare similar bearings for potential differences in amplitude and sound quality. To do this, make a reference point on a bearing housing or use the grease fitting, tune to 30 kHz and reduce the sensitivity until the bearing reads 20 on the meter. Then compare this base reading to other similar bearings. A failing bearing will show an increase of 12 dB or higher and will sound rough. Lack of lubrication will sound smooth but will show an 8-dB gain. Once a series of bearings have been tested, and a base line set, data is recorded and then compared to future readings for historical trending and analysis.
Additional information regarding vibration data logging connections is available by contacting us.