An iterative morphological difference product wavelet for weak fault feature extraction in rolling bearing fault diagnosis

Junchao Guo, Qingbo He, Dong Zhen, Fengshou Gu, Andrew Ball

Research output: Contribution to journalArticlepeer-review

Abstract

Weak fault feature extraction is of great significance to the fault diagnosis of rolling bearing. At the early stage of defects, fault features are usually weak and easily submerged in strong background noise, which makes feature information extremely difficult to be excavated. This paper proposes an iterative morphological difference product wavelet (MDPW) to address this issue. In this scheme, firstly, the morphological difference product filter (MDPF) is developed using the combination morphological filter-hat transform operator and difference operator. The MDPF is then incorporated into morphological undecimated wavelet (MUDW) to construct the MDPW, which can achieve noise suppression and fault feature enhancement. Subsequently, the optimal iteration numbers that influence the performance of MDPW is determined using the fault severity indicator (FSI), which effectively extracts periodic impulse related to the failure of rolling bearing. Finally, the fault identification is inferred by the occurrence of fault defect frequencies in the MDPW spectrum with the optimal iteration numbers. The validity of the iterative MDPW is evaluated through numerical simulations and experiment cases. The analysis results demonstrate that the iterative MDPW has higher diagnosis accuracy than existing algorithms (e.g., adaptive single-scale morphological wavelet (ASSMW) and weighted multi-scale morphological wavelet (WMSMW)). This research provides a new perspective for improving the weak fault feature extraction of rolling bearing
Original languageEnglish
Number of pages23
JournalStructural Health Monitoring
Early online date26 Apr 2022
DOIs
Publication statusE-pub ahead of print - 26 Apr 2022

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