Structure-borne and airborne sound test at release bearings


Marketing/Sales, contact details:

  +49 (0) 9771 68877-500

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Task and procedure:

A noise test is to be performed at completely assembled release bearings. For this purpose, a sensor attached to the bearing housing records the structure-borne sound of the driven bearing. Apart from that, an acoustic recorder records and analyses the airborne sound.The procedure regulates that the operator firstly inserts the part and then starts the automatic test procedure: After the sound protection door has been closed, the bearing is clamped and the internal ring is set into rotation by a hydro dynamically supported spindle. In this connection, there is also an axial loading of the bearing. Then, the structure-borne sound sensor attaches to the component surface and records the bearing's running noises. At the same time, the airborne noise test is carried out. After the test has been completed, the sound protection door opens and the operator may remove the component. With bad parts, the test is first of all repeated. If this test is not successful, the protection door will only open after the acknowledgement button has been pressed. The component is then put into the bad parts container, manually. The analysis of the software developed by FGB allows for the examination of the structure-borne sound by means of freely selectable frequency bands. In this way, the damage can be attributed to the causing component like e.g. outer ring or rolling body.

Cycle time:

20 sec./part


Axial force:

100 – 5000 N adjustable


Speed during test:

100 – 3000 1/min adjustable


Technical availability:



Setup time:

5 min.


Sound enclosure:

Reduction by 30 dB compared to 

original level (75 dB)