Partly Duffing Oscillator Stochastic Resonance Method and Its Application on Mechanical Fault Diagnosis

Table 1

Average of permutation entropy of test signal under various SNR.

SNR	Waveform	Permutation entropy (AVG)
Base signal		0.052
20 dB		0.527
10 dB		0.656
0 dB		0.795
White noise		0.988