Need help to find a proper method to detect resonance freq

[NPalesund]

Hello!

I try to find a resonance frequency from my run-up data.

I have data from 2 channels: TTL and accelerometer. Also, I know the resonance speed - around 720 RMP.

As I know for resonance area the phase should change on 180 degrees but I don't see it from the graph (see attached example).

[wiebe@CARYA]

Without those subVI's it's not going to work...

Sound and vibration toolkit is needed to run this. (Just a warning that downloading is futile if you don't have it).

[NPalesund]

All subVIs from the LabVIEW Sound and Vibration Toolkit

[NPalesund]

Is it possible to make Bode plot from this data?