matlab – Recognizing relevant signal frequencies

I am currently analyzing sensor signals in MATLAB.
enter image description here

As you see FFT is done for the raw and filtered signal.
This is just an exemplary filter, which I need to adjust.

However, I am having trouble deciding which signal frequencies are relevant and which should be filtered out.
I do know that the highest peaks in frequency spectrum depict the most important, however they are not always a clearly visible as on the screenshot which I sent you.

Do you know any methods of determining the most relevant frequencies or maybe you could recommend some articles/literature which would explain it ?

Read more here: Source link