Abstract
Quality inspection is the necessary procedure before bearings leaving manufacturing factories. A testing machine with low shaft speed and light radial load condition is generally used to test the dynamic quality of bearings, which avoids creating any potential damages to testing bearings. However, the signal of defective bearings is easily polluted by very weak noise using the traditional vibration-based measurement method due to the low shaft speed and light radial load condition specified for nondestructive inspection, which needs complicated and time-consuming calculation and is not suitable for online inspection. Thus, there are problems about special operating conditions and weak fault severity in quality inspection of bearings, which is quite different from the fault diagnosis of bearings. In this paper, a novel dynamic quality evaluation technique is proposed based on the measurement of Hertz deformations. The measurement system is mainly composed of an eddy current sensor, sensor fixture, and data acquisition platform with less transfer path than the vibration-based measurement system. The sensor fixture is optimized through numerical simulations to obtain signals with a high signal-to-noise ratio. Accurate evaluation of dynamic quality can be implemented reliably with simple signal processing. The proposed method can be used with a rotating speed of 100 rev/min and test load of 100 N, which is remarkably lower than the traditional quality inspection machineries with a rotating speed of around 1000 rev/min and the test load of 400 N. Both simulation and experiment studies have verified the proposed method.
Highlights
Bearing is one of the most important components in machines. e main life cycle management of bearings undergoes the progress of the quality evaluation, the condition monitoring, and the fault diagnosis
These methods are effective, they do not qualify for bearing quality inspection due to the low shaft speed and light radial load condition specified for nondestruction inspection
The dynamic quality evaluation test is demanded to be done under very low shaft speed and light radial load to avoid the introduction of any extra damages to bearings. is key industry requirement results in that the signal characteristic of defective bearings is too weak to be picked up by the conventional vibration-based approaches
Summary
Bearing is one of the most important components in machines. e main life cycle management of bearings undergoes the progress of the quality evaluation, the condition monitoring, and the fault diagnosis. To overcome the above problem and meet the requirement of dynamic quality evaluation of bearings under low shaft speed and light radial load conditions, a new evaluation method based on the measurement of Hertz deformation of the outer ring using the eddy current displacement sensor is proposed in this paper. Both theoretical studies and implementation of the novel measurement system are carried out to obtain signals with higher signal-to-noise ratio compared with acceleration signals.
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