Bearing Early Fault Diagnosis Based on an Improved Multiscale Permutation Entropy and SVM

<div>Time domain waveform and spectrum of rolling element with different damage degree. (a) Normal state. (b) Slight damage of rolling element. (c) Moderate damage of rolling element. (d) Serious damage of rolling element.</div>

Shock and Vibration

fig7

Figure 7

Figure 7: Bearing Early Fault Diagnosis Based on an Improved Multiscale Permutation Entropy and SVM 