New Multifeature Information Health Index (MIHI) Based on a Quasi-Orthogonal Sparse Algorithm for Bearing Degradation Monitoring

Figure 6

Monotonicity heatmap of hyperparameters , , and . (a)  = 0, (b)  = 0.5, (c)  = 1, and (d)  = 2.

(a)

(b)

(c)

(d)