Intelligent Mechanical Fault Diagnosis Based on Multiwavelet Adaptive Threshold Denoising and MPSO

Table 3

Clustering centers obtained by MSPO.

Machinery condition	Clustering centers
	𝑃1	𝑃5	𝑃6
Normal	0.378	2.882	0.076
Outer-race defect	0.433	6.094	0.571
Inner-race defect	0.118	4.051	0.187
Roller element defect	0.729	5.246	0.022