Applications of Fractional Lower Order Frequency Spectrum Technologies to Bearing Fault Analysis

Figure 16

Frequency spectrum estimations of the normal bearing signal employing the conventional frequency spectrum methods ((a) Blackman-Tukey method; (b) Periodogram method; (c) Welch covariation method; (d) AR model method; (e) ARMA model method).

(a)

(b)

(c)

(d)

(e)