Multispectral Balanced Automatic Fault Diagnosis for Rolling Bearings under Variable Speed Conditions

<div>Comparison between actual values and estimated values: (a) frequency estimated from the original signals; (b) frequency estimated from the envelope spectrum; (c) fitted instantaneous phase values.</div>

Structural Control and Health Monitoring

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Figure 6

Figure 6: Multispectral Balanced Automatic Fault Diagnosis for Rolling Bearings under Variable Speed Conditions 