I want to perform Spectral Kurtosis (Kurtogram) on 10-second vibration signal of 25.6 kHz sample rate, where the shaft is varying in speed.
Will a preprocessing step of resampling the signal be necessary (upsamling; so that there is an equal amount of samples within each shaft rotation), or will the SK handle the non-stationary behaviour?
I'm using Matlabs implementation:
"The fast kurtogram algorithm uses bandpass filtering along with a simplified computation to approximate the spectral kurtosis for each window size and frequency ..
The objective is to diagnose the health of a bearing by first applying an optimal band-pass filter based on SK. After that, I wish to find the enveloped signal. Then, I want to decompose the filtered signal using EEMD to look for fault characteristics. The bearing is on an operating wind turbine.