What are the two main measures derived from a sensing (roller) bearing?
Load monitoring
Lubrication monitoring
What is a typical modern business in which state and load detection are of high interest?
Rental of machines evolvement from
Pay per hour to pay per stress
(Remaining Useful Life prediciton)
What could be the technical basis of a sensing bearing
The build up of a lubrication film that has changing electrical properties over the different states of friction
Only roller bearing: The change in Hertzian area that changes the capacity/ impedance
How does the sensing bearing differentiate from other monitored types of bearing like Ultrasonic or strain monitored bearings?
In these cases additional equipment is necessary to monitor the bearing like a strain gauge or an ultrasonic transmitter & reciever, in the case of the impedance/ capacity sensing bearing the bearing itself provides the measures of interesst.
What data handling technices are well suited for evaluating the sensing bearing data
Machine Learning approaches wer quite succesfull in generating load estimations with the given data (Mainly impedance and Capacity)
Physical modelling approacehs required a high effort and showed only mediocre results.
How can the frequency spectrum of the given data be analyzed and used?
Via a FFT
Changes in height of f0 can give a hint about unbalances in the Rotating system
With higher order dominants, damages can be detected (e.g. order 3,6 for a surface defect in a ball)
(characteristic bearing fequencies)
How can the Lubrication state be quantified
The relative contact time can describe the state of the Lubrication:
Last changeda year ago
