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. 2017 Oct 28;17(11):2477. doi: 10.3390/s17112477

Figure 7.

Figure 7

PCA representation of testing characteristic vectors from simulated bearing model: conditions of intact (■), inner-race defect (▲), outer-race defect (●), and rolling-element defect (♦), (a) before, and (b) after PSO optimization.