application of wavelet to vibration signal
I've been working on this area for a while. The wavelet transform is a more powerful tool for time-frequency (TF) &amp; feature extraction since the FFT or STFT always suffers from the resolution issues in TF domain. As a starter, I think the short videos provided in MATLAB is a very good point to start with. I paste the 1st part here and you can also find the rest parts from it.

https://www.mathworks.com/videos/understanding-wavelets-part-1-what-are-wavelets-121279.html

Bests,
GL