A Fault Diagnosis Method for Rotating Machinery by Multimode Feature Entropy and Mutual Cooperation Broad Learning System

Rotating machinery plays a pivotal role in petrochemical units. However, compound and single faults frequently occur in rotating machinery due to the complexity of operating environments and the coupling of faults. This article presents a new compound fault diagnosis method to address the problem of poor diagnosis effect caused by mutual interference between multiple fault responses. First, the observable signals are decomposed via complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN). Wavelet threshold filtering and reconstruction (FR) of the intrinsic mode function (IMF) are then utilized to construct a feature matrix consisting of multimodal feature entropy (MMFE). Finally, a mutual cooperation broad learning system (MC-BLS) model is developed to identify compound faults rapidly. The proposed theoretical model is validated using compound fault datasets obtained from the Key Laboratory of Guangdong University of Petrochemical Technology (PKL-data) and single fault datasets obtained from the Bearing Data Center of Case Western Reserve University (CWRU-data). Experimental evaluations conducted on these datasets demonstrate accuracy rates above 96% for both the compound fault dataset and the multiple single fault datasets. These results confirm the excellent performance of the proposed method recognizing both single and compound faults.