Curve variation and point detection

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,

Louise

Answer 1

[Rohit Pappu]

%% 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];