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mrkbrnlmr
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- TL;DR Summary
- Should both envelope detection and windowing+overlapping be used before FFT?
Summary: Should both envelope detection and windowing+overlapping be used before FFT?
Summary: Should both envelope detection and windowing+overlapping be used before FFT?
Hi everyone!
I'm somewhat a newbie to signal analysis, but I've also noticed that there seem to be many different solutions to a particular probem and no one correct answer.
This is specifically related to bearing fault analysis, but I guess the principals remain the same regardless of the application.
The dilemma I’m having, is that, on one hand, envelope detection is needed in order for FFT to detect the bearing fault, but on the other hand, FFT is first required so that the signal can be bandpass filtered around the bearing fault and then returned to the time domain so that envelope detection can be applied. Is it not a "catch 22" situation?
So what is the right order for FFT, bandpass filtering and enveloping?
Also, should windowing+overlapping be performed together with enveloping and if so, which comes first?
Finally, if you can provide an academic reference for your answer, I'd be most thankful.
In any case, a huge thank you in advance!
Summary: Should both envelope detection and windowing+overlapping be used before FFT?
Hi everyone!
I'm somewhat a newbie to signal analysis, but I've also noticed that there seem to be many different solutions to a particular probem and no one correct answer.
This is specifically related to bearing fault analysis, but I guess the principals remain the same regardless of the application.
The dilemma I’m having, is that, on one hand, envelope detection is needed in order for FFT to detect the bearing fault, but on the other hand, FFT is first required so that the signal can be bandpass filtered around the bearing fault and then returned to the time domain so that envelope detection can be applied. Is it not a "catch 22" situation?
So what is the right order for FFT, bandpass filtering and enveloping?
Also, should windowing+overlapping be performed together with enveloping and if so, which comes first?
Finally, if you can provide an academic reference for your answer, I'd be most thankful.
In any case, a huge thank you in advance!