Bearing fault detection based on an analytic energy operator of symmetrical differencing under complex background

Abstract

An alternative energy operator, analytic energy operator of symmetrical differencing was proposed. The improved demodulation technique was developed based on the energy operator of symmetrical differencing. The energy operator of symmetrical differencing is sensitive to noise and vibration interferences, so its application is limited in some fields. However, the analytic energy operator of symmetrical differencing is able to detect the weak fault signatures from the heavily contaminated signals. Thus, it is more robust than the energy operator of symmetrical differencing. The results of simulation test and bearing fault experiments demonstrate that the novel method can effectively extract fault features, certifying its superiority in comparison with previous methods. Therefore, it is likely to be useful and practical in the fault detection area, especially under the condition of strong noise and vibration interferences.