Digital Twin Inspired Intelligent Bearing Fault Diagnosis Method Based on Adaptive Correlation Filtering and Improved SAE Classification Model

Figure 11

The spectrum of the high-pass filtered signal at different cut-off frequency: (a) 500 Hz; (b) 1000 Hz; (c) 2000 Hz; (d) 3000 Hz; (e) 4000 Hz.

(a)

(b)

(c)

(d)

(e)