Universal Vibration Listening Amplifier

1300 884 007
+61 8 9317 2000
Sound Files

Sound Files

Listen to the vibes and believe what you hear.

We have provided sound files here of high frequency noise to help you identify what is normal mechanical bearing noise, what a poorly lubricated bearing sounds like, what a defective bearing sounds like and what an over lubricated bearing sound like.

Cooper Split Bearing in normal condition.

Cooper Split bearings are inherently noisy but this sample is a typical example of one working fairly normally. Bearing is located at a large fan.

Cooper Split Bearing in poor condition.

Compare the bearing above with this this noisier example, both on identical machines under identical conditions. The acceleration data amplitudes here are significantly higher indicating excessive wear.

Small Motor DE Bearing.

This motor is driving a belt to an adapter-sleeve type impeller fan. They are often poorly assembled and can thus suffer product build-up. The acceleration amplitudes seen on the FFT on the motor DE bearing are significantly high, however the sound file is okay. Rather than jumping to any conclusions using solely the FFT data, the audio file suggests further investigation is required before making any call on this bearing.

Same Motor, NDE Bearing.

There is some looseness here at the NDE which is indicated in the higher velocity amplitudes and is confirmed clearly in the noisy audio file.

NDE of Small Motor with Pinion gear driving a Gearbox.

There is clearly a looseness in the bearing here although the bearing itself seems okay. The crest factor is quite high, probably as a result of the impacting. This is something you definitely wouldn't ordinarily see in the data but is quite obvious in the sound file.

Input Shaft Bearing of the Gearbox.

The sound file clearly indicates some tooth damage on the high speed pinion. This would likely be seen clearly in the acceleration time waveform but is a good example of how gearbox faults can be clearly heard. Both the motor and the high speed pinion are scheduled for shut in 90 days’ time (if they make it).

Small Motor NDE Bearing.

This motor drives a belt to an impeller fan. This bearing sounds normal, and the data is good. Note- Because this data is recorded some distance from the actual bearing you tend to get less bearing noise and more electrical hum.

Same Motor, DE Bearing.

This bearing sounds worn and dry. The analyst might expect the demodulation spectra to show a high noise threshold. Good comparison to the NDE. Note- These two bearings are less than 12 months old.

Fan DE Bearing – UVLA filter OFF.

This bearing is located at the pulley end of a shaft which is driving an impeller fan. A small motor drives the pulley via a belt (similar to above machines). These acceleration values are marginally high but it sounds reasonably okay. Possibly a little dry.

Fan DE Bearing – UVLA filter ON.

Exactly the same point, this time with the 2kHz high-pass filter on the UVLA switched in. This data enables the high frequency, low-amplitude noise to be clearly heard. This is indicative of a worn bearing. The relatively high acceleration amplitudes confirm this in the data.

If you have a sound file you would like to share with us, please let us know.

Please feel free to call our friendly customer service and request more information and a quote on the Baseline UVLA F-Pro, Universal Vibration Listening Amplifier.

1300 884 007 or International +61 8 9317 2000

Choose the dealer closest to you.


Baseline uvla

1300 884 007

PO Box 4091



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