Quality inspection is the necessary procedure before bearings leaving manufacturing factories. A testing machine with low\nshaft speed and light radial load condition is generally used to test the dynamic quality of bearings, which avoids creating any\npotential damages to testing bearings. However, the signal of defective bearings is easily polluted by very weak noise using the\ntraditional vibration-based measurement method due to the low shaft speed and light radial load condition specified for\nnondestructive inspection, which needs complicated and time-consuming calculation and is not suitable for online inspection.\nThus, there are problems about special operating conditions and weak fault severity in quality inspection of bearings, which is\nquite different from the fault diagnosis of bearings. In this paper, a novel dynamic quality evaluation technique is proposed\nbased on the measurement of Hertz deformations. The measurement system is mainly composed of an eddy current sensor,\nsensor fixture, and data acquisition platform with less transfer path than the vibration-based measurement system. The sensor\nfixture is optimized through numerical simulations to obtain signals with a high signal-to-noise ratio. Accurate evaluation of\ndynamic quality can be implemented reliably with simple signal processing. )e proposed method can be used with a rotating\nspeed of 100 rev/min and test load of 100 N, which is remarkably lower than the traditional quality inspection machineries with\na rotating speed of around 1000 rev/min and the test load of 400 N. Both simulation and experiment studies have verified the\nproposed method.
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