Title Fault Diagnosis Method of Gearbox Multifeature Fusion Based on Quadratic Filter and QPSO-KELM

Figure 16

Comparison of fault diagnosis results: (a) ELM classification results without filter; (b) ELM classification results with quadratic filtering; (c) PSO-KELM classification results without filter; (d) PSO-KELM classification results with quadratic filter; (e) QPSO-ELM classification results without filter; (f) QPSO-KELM classification results with quadratic filter.

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