A Higher-Order Symmetric Difference Analytic Energy Operator and its Applications to Detect Weak Bearing Fault Signal

Considering that the inadequacy of the inferior performance of the symmetric difference analytic energy operator (SD-AEO) technique in the presence of vibration interferences with higher amplitudes, an improved analytic energy operator (AEO) based on SD-AEO is proposed in this work.This proposed energy measure takes advantage of the higher-order symmetric difference to substitute the symmetric difference for the sake of boosting the signal-to-interference ratio (SIR), which can enhance the ability to detect the weak fault signal in the presence of vibration interferences with larger magnitude.Furthermore, the energy transformation of this proposed energy operator is weighted by absolute value to prevent the negative values in the transformed signal.Under the simulated tests, the superiority of the immunity to intensive noise and interferences as well as the non-negative property is demonstrated.Finally, the proposed energy detector is applied to the real-world data measured from the defective bearings, and it is found that this proposed fault detection tool can successfully identify the weak fault signatures under a severe working condition. © 2021, Chinese Institute of Electronics. All right reserved.