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Curve variation and point detection

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Hi all,
You could find enclosed a vibration signal (vibration_illustration.pdf).
My goal is to detect (automatically if possible) the first and second impact.
I also attach the signal (.mat)
Do you have any ideas of doing that ?
Thanks in advance for your help,

Accepted Answer

Rohit Pappu
Rohit Pappu on 24 Nov 2020
%% Location of first peak
[pk1,loc1] = findpeaks(Signal, 'MinPeakHeight',0.15)
%% Location of second peak
subSignal = Signal(1,500:end);
[pk22,loc2] = findpeaks(subSignal, 'MinPeakHeight',0.06)
%% The point preceding the peak may not be the point of deflection
desiredlocs = [loc1-3 loc2+500-6];

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