Abstract
Purpose
To improve the recognition accuracy of the existing fuzzy entropy method for bearing fault signals, a novel processing method by combining improved refined composite hierarchical fuzzy entropy (IRCHFE) and least square support vector machine (LSSVM) is proposed.
Methods
In this method, an improved refined composite hierarchical analysis applies to solve the problems of incomplete extraction of the existing multi-scale fuzzy entropy (MFE) fault information, inaccurate estimation of the entropy value of the hierarchical fuzzy entropy (HFE), and the inability of the hierarchical analysis to handle arbitrary data lengths. First, the IRCHFE method applies to extract fault information from the vibration signal. Then, LSSVM effectively recognizes and classifies the extracted fault information. Furthermore, the application of PSO to adjust the parameters of LSSVM increase classification accuracy.
Results
The superiority of the IRCHFE-LSSVM method is verified by the bearing experimental data of Case Western Reserve University and Paderborn University. The experimental results show that the IRCHFE-LSSVM has a fault recognition accuracy of 100%. The comparative experiment results display that the proposed IRCHFELSSVM method is superior to MFE-LSSVM and HFE-LSSVM in identifying bearing fault types.
Conclusions
The combined method of IRCHFE and LSSVM for fault diagnosis can provide certain guidance for the engineering application of fault diagnosis.
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Abbreviations
- ApEn:
-
Approximate entropy
- EMD:
-
Empirical mode decomposition
- FE:
-
Fuzzy entropy
- HFE:
-
Hierarchical fuzzy entropy
- IRCHFE:
-
Improved refined composite hierarchical fuzzy entropy
- LSSVM:
-
Least square support vector machine
- MFE:
-
Multi-scale fuzzy entropy
- MF:
-
Morphological filtering
- SampEn:
-
Sample entropy
- SVM:
-
Support vector machines
- PCA:
-
Principal component analysis
- PSO:
-
Particle swarm optimization
- WT:
-
Wavelet transform
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Wang, Hq., Yuan, Ly. Fault Diagnosis of Bearing Based on Improved Refined Composite Hierarchical Fuzzy Entropy and Least Squares Support Vector Machine. J. Vib. Eng. Technol. 10, 3025–3036 (2022). https://doi.org/10.1007/s42417-022-00534-8
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DOI: https://doi.org/10.1007/s42417-022-00534-8